text stringlengths 83 79.5k |
|---|
H: Output voltage when turned off
I have a DAC (datasheet available here) that has a SLEEP mode (see page 14). When SLEEP mode is activated, my oscilloscope reads an output voltage of about 1.65V on each output, which is about half of the supply voltage if 3.3V.
I want to check that this output voltage makes sense, bu... |
H: How to sharpen blue LED voltage-to-current knee at 3.0 V?
I want to use blue LED as simple 3.0V nominal vs brownout indicator. It will be mounted on tiny proto board and will be plugged into rails or other various parts of breadboard. I want to make same plugs for 4.9V and 1.8V.
The LED is bright at 5mA 3.2V. And ... |
H: How to charge Polymer Lithium Ion Battery that comes with the Lilypad Development Board
There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using th... |
H: Estimating costs for producing and implementing RFID systems
What type of RFID could I attempt to emulate myself easily for projects in a classroom. There are many technologies that are available and I am having a hard time selecting an RFID system that would both allow a demo of RFID and and best cost effective f... |
H: Keyboard USB cable reconnnection
I've just tried to repair my keyboard's usb cable as it has been damaged right where it goes into the keyboard. I've cut out the bad part of the cable and reconnected the wires. I've tried it and all is working well but I've used tape (lots of it :D). So it is possible that at some ... |
H: Flyback diodes issues and pull-in & hold current issues in this Relay circuit
Although this may be a basic question but I'm still struggling with it. In this schematic, two zener diodes D1 and D2 are connected back-to back across relay coil L1. The BVds = -30V for Q1. Can I use 15V(Vz = 15V) zeners for D1 and D2 in... |
H: Supplying ac to a dc circuit
So a while ago, i was stumbled upon a post what will happen to the dc circuit when we supply ac to it. Lets assume the ac has the same voltage as the dc. We know that ac switches direcions so there will come a tome it is positive, zero and negative.
If the ac is in its positive voltage... |
H: Will a TIP42 suffice for this project that calls for a BC559 (transistors)?
Im building a Nintendo 64 USB adapter as outlined in this guide. For the transistor, it calls for a BC559. At RadioShack, the most similar one I could find was a TIP42. Will this work for this particular project? I thought I was mainly look... |
H: Replacements for a 4006 IC?
Im building a Nintendo 64 to PC adapter as outlined in this guide. It calls for two 4006 ICs. RadioShack did not have this type, but I was told the following two would work: LM339 or a LM324. Will either of those suffice for the project mentioned above?
AI: Don't listen to these RadioSha... |
H: Schematic for N64 controller to PC adapter confusing
I'm working on this currently.
I'm a bit confused as to how this tutorial expects me to connect it to the controller. It just shows the controller plug with the three holes. How exactly do I connect the wire into that? It says the left hole is a ground wire. The ... |
H: Where should I put the fuse in this circuit ? Critic the design
I've the following circuit , that used to measure the current through shunt resistance ,
The circuit have analog & digital ground ,
the terminals 1 ,2 ,3 are for AC source .
I need to protect this circuit from shorts .
So where's the right place to ... |
H: how to test isolation of DCDC convertor?
I have an isolated DC-DC convertor which boasts a 1.5kV isolation. I have a PCB made along with the additional components it requires. How can I test it?
AI: I assume that you have from 1 kV to 2 kV available as required for testing. If your question includes "how do I gener... |
H: Newbie question about compatibility
My project looks like it's perfect for the combination of Sainsmart Arduino UNO and the 8-channel 5v Solid State Relay Module. It's a kinetic artwork with eight, AC-powered light circuits. Three questions:
Are these two boards compatible? That is, can the UNO's digital outpu... |
H: Voltage and Current Limiting Circuit
I'm a newbie to circuit design, so I think I'm either really lost or over thinking this (most likely the former). I need a circuit that will act like a current limiting power supply, which I can design in a specific voltage (20mV) and current limit (100mA) across multiple indep... |
H: Is there a standard Ethernet Connector?
I am looking for a PCB mount RJ45 connector. I find that there are about 10-12 types of RJ45 connectors( 6pin, 8 pin, 10 pin, 12 pin, 14 pin ). Even the PCB footprint is different for some connectors with same number of pins. If there is no standard connector, I would like to... |
H: How to detect surges in the main AC
Electronics have a habit of breaking in my house. In the last 2 years or so, I had 3 desktops, 1 monitor, 4 cellphones going dead. They are not completely dead like they won't turn on. But in the case of cellphones, one of them end up showing only white screen at max brightness, ... |
H: SIM card: Detected when the card is removed
I have an STM32 with a SIM card reader. For some reason the DETECT pin interrupt is triggered when the SIM card is removed, as opposed to when the SIM card is inserted.
What could be going wrong here?
AI: Possible reasons I can think of:
the card detection switch switc... |
H: Control speed of brushless DC motor
Assuming I have a brushless DC motor which externally exposes only a + and - terminal. (I.e. I do not have access to the windings and hall sensor directly.)
Is there a way to control the speed? With a brushed DC motor one could just reduce the supply voltage.
Am I correct in assu... |
H: Is there a way to miniaturize cell-phone power adapter
Is there a way to miniaturize a cell-phone power adapter to be not bigger than 1-3 cubic centimeters? Is there a way to do so by using more expensive parts or something like that?
I'm talking about usual cell-phone power adapters that transform 110 AC to 5V 1 A... |
H: Relay with arduino/microcontroller, diode needed?
I know that you have to place a diode in parallel with a relay to use with i/o on microcontroller. Would you have to do the same with a relay board such as......
http://www.sainsmart.com/module/acce...-pro-mini.html
http://www.sainsmart.com/module/acce...p-arduino.h... |
H: Question about relay module
I just discovered a Sainsmart 4-Channel 5V Relay Module for PIC ARM AVR DSP Arduino MSP430 TTL Logic, I don't know how to make links, so I copy the URL here. http://www.sainsmart.com/arduino-pro-mini.html .Maybe the moderator can edit it a little bit.
And I have a question. I'm in need ... |
H: How to connect a SPCO relay?
I have a relay SRM-1C-SL-5VDC. I am trying to switch the load On/Off using this relay. I am not sure how to connect it correctly as there its not mentioned clearly in the datasheet. Which pin on the relay am I supposed to connect the Load? I have uploaded my schematic below. Pin 1 on th... |
H: Variable resistor with odd upper limit
I have a device that is controlled by connecting a resistor between two of its connectors. The resistor can take any value between 0 and X, where X is an odd value. (E.G. X=1523ohm)
Does anybody have an idea how I can realise a circuit whose resistance can be varied manually b... |
H: Measuring the phase difference between two signals
I'm looking for an analog method of measuring the phase difference between two signals operating at frequencies in the range from (0 - 20 MHz). I'm wondering if there's an IC that does that or a specific circuit that converts the phase difference into a voltage sig... |
H: Diode fails open
The question asked is the following:
The book says that the correct answers are: \$V_{limit}\$ = 0V, \$V_{diode}\$ = 5V.
I don't get why it ended up like that. My intuition says that, "fails to open" means not functioning, and so no forward current flowing in the diode. In that case, the voltage ... |
H: Calculating resistance in decibel
In EMC there is an equation for charactristic impedance (If I am not wrong) that is defined as:
$$Z_w = \frac{E}{H}$$
As you know \$E\$ is expressed in Volts and \$H\$ as Ampers.
I had the exam today and for sake of confusion of students, the teacher brough this values in dB. But I... |
H: What gives some flash memory a higher speed rating than other flash memory?
What gives some SD/MMC cards a much higher speed class rating than other SD/MMC cards?
Why are some solid-state "disks" (SSDs) much faster than other SSDs?
I'm hoping that I can take at least some of ideas for storing data faster, and apply... |
H: What is the acceptable current draw on pin #9 on a VGA connector?
I'm trying to appropriate the 5v that comes into an LCD monitor on pin #9 of a VGA connector to power a microcontroller with some sensors, and LEDs.
I've found a discussion on this topic on a cached forum thread from EEEforums. While there are ref... |
H: Why does micro USB 2.0 have 5 pins, when the A-type only has 4?
What is the extra, 5th, pin on micro usb 2.0 adapters for?
Here is an image with the different connectors. Most of them have 5 pins, but the A-type host only has four.
(source: wikimedia.org)
AI: It's for On-The-Go, to select which device is the hos... |
H: MC34063A: Why am I overclocking this chip?
I've decided to get some experience with DC-DC converters and I've obtained an Onsemi MC34063A DC-DC converter. From documentation I've got the datasheet, the AN920 application note and the Excel worksheet. The datasheet mentions one more application note, the AN954/D, but... |
H: How to wire AC power to an integrated DPST switch?
I have an IEC C14 power connector (like those on PC power supplies). The connector has an integrated DPST switch, however the power pins are not connected directly to the switch-- I have to do that myself.
My first question is: Why have a DPST switch? Why not jus... |
H: frequency modulation
I hope this is a pretty easy question for you guys.
I know for frequency modulation (FM) for fundamental frequency you have the expansion
$$output = J_0(\beta)V\cos(\omega t)\pm J_1(\beta)\cos((\omega \pm \omega_m)t)+...
$$
I am wondering what is the equivalent for the third Harmonic? is it
$$... |
H: Polarity of unmarked smt electrolytic capacitor
I have a kit with three capacitors, described in the parts list as "10uF 25V SMD 1206" and shown on the circuit diagram as polarised (an open rectangle and a filled one). Seen through the transparent side of the package they are pale brown or orange, and appear to be ... |
H: Accellerometer and arduino lillypad and wearable projects
I have just bought an Arduino Lillypad and an MMA8452 accellerometer board and i have few questions:
1) Power supply on lillypad
I know that working with accellerometers is a little bit dangerous: if you plug them to 5v instead of 3.3v you can burn them! So,... |
H: Determine the orientation of an ESD protection chip
I have an ESD protection chip that has been unsoldered from my board, and for which we have lost the orientation. (I.e. we don't know where pin 1 is - the little dot has gone.)
Because of the symmetry of the IC's package, there are two possibilities for the orient... |
H: Recommend good kits to Newbie
I have $50 to spend on an arduino hardware. I've looked around at some intersting kits.
I found a kit that might be what I want, http://www.sainsmart.com/sainsmart-mega2560-board-3-5-tft-lcd-module-display-shield-kit-for-atmel-atmega-avr-16au-atmega8u2.html
So far that costs $55. Are ... |
H: Brushless motor controlled via current source math model
I'd like to model a brushless motor's (BLDC) dynamic response using Matlab. I'm controlling the motor by an Elesctonic Speed Controller (ESC). I'd like to derive a transfer function of such a circuit with shaft's angular speed being its output (as here) and w... |
H: Using relay to control
Using a relay, if I found a 12v source on the ps3 motherboard that was on only when the ps3 was on. Could I attach a 12v relay switch to it and the connect some LEDs that run off another power supply so that when the ps3 turns on the LEDs do too?
Thanks
AI: You could do that, but instead of u... |
H: Microcontrol port for lcd
Ihave modify an existing lcd library, it only works on DDRA for exmple if i change:
Update error Fixed:
I have found the error in the code assembly delay was too short for port B, C and D. by changing delay time i was able to use all ports.
Im using a AVR ATMEGA16. i have also wiring the p... |
H: MCP3909 Energy metering IC , How to use the HFOUT in it?
I'm using the Microchip MCP3909 Energy metering IC, How to use the HFOUT in it ?
note:
HFout supplies a frequency output proportional to the average active real power .
This frequency should be sent to the meter on HFOUT pin which access a Timer/Counter in ... |
H: Effective number of bits of 14-bit ADC
I have a 14-bit ADC. However, looking at the datasheet (see table 2 on page 5), the effective number of bits (ENOB) is always less than 12 bits.
Why is my the DAC claiming to be a 14-bit ADC when it only has 12-bit accuracy? What is the point of having two extra bits if they a... |
H: Cheap temperature sensing with MCU
I am looking for a cheap solution for sensing temperature with a MCU. My requirements are:
2 channels
temp range: 30-35°C
temp resolution: 1-2 K
cable distance (MCU -> sensor) 10cm - 2m are acceptable
relative temperature between two channels is sufficient, no absolute temperatur... |
H: How a capacitor works
I have an AC capacitor from the ceiling fan.
When I connect its end to a socket (AC line 110V), it gets charged (as touching the terminals produces a spark).
But at this point I am unable to understand this mechanism because I have read that capacitors don't charge storage for AC and act almos... |
H: EPROM Replacement Strategies
We have a system that uses OTP (one-time programmable) EPROMs, specifically the AT27C256. We would like to replace this EPROM with an EEPROM or Flash chip such that we can make our units field upgradeable, more serviceable, etc. Obviously, we want this change to require little to no har... |
H: How to calculate self-discharge time of capacitors given the leakage current?
Say I have a Maxwell BCAP0005 supercap (2.7V, 5F), which has a leakage current of 0.015mA. I'd like to estimate the time it takes to discharge to a certain voltage.
I've tried applying a formula for constant current discharge,
$$
t = \fr... |
H: How safe are pre-charged supercaps compared to pre-charged batteries?
How safe is it to transport and sell pre-charged supercaps with a system?
I'm designing a solar-powered system and I'd like to use something like a
Maxwell's BCAP0005 supercap (2.7V, 5F) to store the energy.
Even with a supercap charger circ... |
H: Manuals for oscilloscope wanted
I bought at Amazon Germany an oscilloscope SainSmart DSO203 NANO. Unfortunatedly it came without any manual.
Do you have manuals for oscilloscope? Any help would be appreciated.
AI: This appears to be one of those devices sold by many places with slight variations in name.
Some gen... |
H: how switched mode power supply affect microcontroller functionality
I am using a switch mode power supply RAC06-05SC to power up the microcontroller (ATMega16L) a wifi module (RN-131G) and a 5V relay. This power supply is already regulated (as stated in the datasheet) and it is regulated further down to 3.3V for th... |
H: USB / Battery Switchover Circuit
Background: I am a non-EE (an 0x11? :^) thrust into the world of embedded systems design. I started this project with a only college physics-level understanding of circuits, but I'm gradually learning.
The design I'm working on consists of several sensors, an SD card, and a TI CC111... |
H: what is transparent operation on rf?
Whenever I am searching Rf module, I have seen transparent operation on some module.I have searched meaning of transparent operation, but I could not find anything. My questions are
What is the transparent operation ?
Why is it used in RF module ?
What are the drawbacks of th... |
H: Transistor With No Voltage to Base
In the newest Make magazine, they show how to connect LEDs in line to speakers to have the LEDs light up when the speaker is playing music (pulse with the music). They say you may want to hook up the LEDs to a 9 volt battery in order for the LEDs to come on at lower volumes. The... |
H: Grounding Shielded Panel-Mount Connectors
I'm building an amplifier in a conductive metal chassis. The general grounding plan is to have an audio ground, a power ground, and a digital ground that converge at a single point on the chassis. However, my audio connectors are all panel-mount, so the shield of the connec... |
H: I2C minimum clock speed and reliability
Is there a minimum clock rate specified by I2C? I know the most widely used clock rate is 100kHz and there is a "fast" mode of 400kHz supported by some devices, and a faster yet mode supported by other devices (I think 1MHz?). Since the SCK signal is generated by the master I... |
H: Soldering PCBs directly together
I am attempting to replace an old PLCC32 part that was directly soldered to the board with a new part of undecided form. We will definitely need an adapter as we have not been able to find a PLCC32 part that does what we need. I cannot use a PLCC adapter plug because there are also ... |
H: About SPICE: Should I use transient analysis or DC linear analysis?
My question is specifically linked to an exam problem where I had to find a function in terms of time for the current on a capacitor and a resistor. The circuit was very simple: A current time-variant current source in series with 2 subcircuits, ea... |
H: how hard can it be to soldier and assemble Sanguinololu 1.3a without prior experience
I'm interested in building a 3d printer myself. I need to get Sanguinololu 1.3a board.
I saw two options on ebay, assembled and unassembled.
Cost difference is quite large where assembled (DIY £35, built £58).
I'm wondering exact... |
H: How to use Arduino Bluetooth module?
I am trying to get my arduino working over wireless (via bluetooth). I would like to send serial signal though it via bluetooth, but I am having some difficulty getting the bluetooth module I purchased actually showing up on any of my computer's bluetooth scan.
This is the skim... |
H: Relay trouble again
I'm having trouble again with a set of relays. It is the small set that only has the two relays on the board. I've tried wiring them every way imaginable and they still won't work properly. The only way they will come on at all, is if I put my 5 VDC to the VCC terminal, and they will not actuate... |
H: A quick question on relays
I have a circuit that normally runs at 3-5v and then when triggered, it gets pulled to ground (around .1-2 mv leakage). I want to use this to trigger a relay to close a different low voltage circuit. Can I use the "Sainsmart DC 5V Relay Module for Arduino PIC ARM DSP AVR MSP430 TTL Logic"... |
H: How can I convert a 2 prong connector to USB?
I'd like to convert this:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=060-640&utm_source=googleps
to a USB? An ideal solution for me because of cost would be to use an existing usb controller from a usb keyboard. I was hoping someone might help bridge the ga... |
H: A/D Beginner Question
I want to just get an idea about the complexity of a hobby project before getting started on it.
I want to use a sensor that outputs an analog voltage. However, I want to use an A/D convertor to convert this into a digital value and then feed this into a PC via USB. The analog voltage is betwe... |
H: Minimum operating temperature - Outer Space?
I've been looking at some microcontrollers and I've seen they've got some "weird" minimum operating temperatures, like -25 degrees or -10 degrees etc. But I can't really understand why there is a minimum, a maximum I do understand because everything melts down and breaks... |
H: High powered driver for 10W and 45W LEDs
I have 8 x LZ4-00B200 (14V, 700ma operating) and 8 x LZ4-00R200(9V, 700ma operating) which I would like to wire off of one power supply.
My problem is two fold. First, how should I organize the 16 LEDs? 16 in series? 8 in series in parallel with another 8 in series? I'm not... |
H: Radio with crystal oscillator
Is it possible to make a 20 MHz radio with this
by creating a circuit consisting of a battery, that crystal oscillator and an antenna?
AI: No. It's not an oscillator, it's just a crystal. You'll have to build an oscillator with it yourself, which only requires a few components, for in... |
H: Can I mimic Arduino Ethernet library through serial?
I'm ordering an Ethernet Shield for a project I have planned, but before make the investment, I want to make sure the project will work. Eventually it will communicate with a website via ethernet, but I was wondering if I could test this through my PC, using it s... |
H: Is an ALU a multiplexer?
I'm studying digital electronics where the components ALU and multiplexer appear. To me the ALU seems like a multiplexer but it's not specifically mentioned that this is the case. Is it so, or why not?
AI: No, it's not a multiplexer. A multiplexer would select one of both inputs, in an ALU ... |
H: One-clock increment operation in a three-bus CPU architecture
In his chapter on CPU design, Edward Bosworth introduces the following three-bus architecture:
One of the main design aims of this circuit is to be able to increment the program counter PC in a single clock cycle. According the the accompanying text, th... |
H: Digital Dimmer With Microcontroller
I want to build a digital dimmer for resistive Loads.
I have found this circuit for that:
The input voltage is 220VAC 50Hz.
The red box in the picture is for Zero Crossing Detection.
When the AC voltage crosses the zero, the Microcontroller will be interrupted an therefore de... |
H: Why does the base-emitter voltage of a BJT decrease with temperature?
According to Sedra/Smith Microelectronic Circuits, \$v_{BE}\$ changes by \$-2\text{mV}/\text{°C}\$. I cannot understand how this could possibly be the case given the equations I am familiar with.
With all currents kept constant, we have:
\$\large... |
H: Difference between drill layer, hole layer, and milling layer in Eagle
What is the difference between the drill layer (44), the hole layer (45), and the milling layer (46) in Eagle PCB?
AI: Drill layer (44) is used for pads (of through hole components) and vias.
Hole layer (45) is used for mounting holes.
Milling l... |
H: Arduino has an input value in disconnected pin
I'm new to arduino. Maybe is an elemental question...
If I load this program:
int mval = 0;
void setup() {
Serial.begin(9600);
// set up the LCD's number of columns and rows:
}
void loop() {
mval = analogRead(1);
Serial.println(mval);
delay(1000);
}
I ... |
H: How can I correctly wire my switch into my USB-to-Serial adapter cable?
Referring to this question:
How can I convert a 2 prong connector to USB?
I have decided to go with this solution:
(2) You could use a cheap (from $5) serial to USB adaptor and wire the switch to eg the CTS line. This can be detected by a PC pr... |
H: Determining the beam frequency & EM-component that is emitted from the human eye (supposedly)
I am interested of determining how much truth there is in a persons claims that our eyes emit a beam that can be detected by a device that he has built and patented.
The person who invented the device is Colin A Ross (MD),... |
H: Measure AC Sine Wave amplitude with ADC
I have created an AC sine way using a wien-bridge network.
I would like to measure the peak to peak voltage of this wave using my microcontrollers ADC.
I cannot just use this wave as an input to my Analog Input pin, as of course the electrical specification specifies no negat... |
H: what is the resistance of hydrogen?
If I were to connect a bettery to the two sides of a container that contain only hydrogen gas, and its not dense (it's pressure is one atmosphere), what would it's resistance over the length of the container be?
AI: Depends on the container's dimensions. Specific resistance is of... |
H: Sainsmart relay output wiring
I have a 2 Relay module from Sainsmart. http://www.sainsmart.com/arduino-pro-mini.html/
The output has 3 connections instead of just 2. I want to know which two of these three connections I need to wire up. I want to find this out without actually having to connect my final 240V cable.... |
H: Intro Circuits Class Inductor question
This is a question from my intro circuits class that I can't figure out the answer to:
Of course it's very simple, but I had a professor who was incomprehensible most of the time, and my textbook doesn't have any examples similar to this. Would someone please either point me ... |
H: What do these switch ratings mean?
Current rating: 3A @ 125 VAC, 1A @ 250 VAC
What can I read to understand these ratings better? What exactly does it mean?
They're used to rate this Momentary N.O. Raised Push Button Switch.
AI: revised 2012-07-15
Motor and solenoids loads create more arc and can reduce **life ex... |
H: Help me interpret solenoid shopping info
I'm trying to get a cheap pull-type solenoid that can operate for at least ten seconds at a stretch to serve as an electronically-controlled ward in a lock (for a wooden box) I'm building.
I'm a novice and confused at my findings. Can anyone enlighten me?:
This model touts a... |
H: Communication between multiple microcontrollers
I'd like to start implementing a system consisting of N microcontrollers (N >= 2 MCUs), but I would like to know the possibilities to let them communicate one with the other.
Ideally, (N-1) microcontrollers are placed inside the house acting as clients, while the last... |
H: Power supply too weak, any danger?
I have a car console that i wanna test on my work bench. It's rated at 10A DC max @ 12v, but I don't plan on driving any speakers, so the draw should remain fairly low. My power supply can only provide 3A DC @ 12 volts. If the console DOES exceed the 3A draw, will it just not func... |
H: What does A x B mean when referring to wire strand count?
Stranded wire is often specified using two numbers in the format A x B. For example, 16 AWG wire might come with a 19 x 29 strand count.
What do the first and second numbers mean?
AI: Vicatcu is right, the first number, being 19 is clearly the strand count.... |
H: How would I design a protection clipper circuit for ADC input?
I'd like to be able to protect my ADC from input voltages higher than 5V. What's the simplest protection circuit I could build to have an output like shown below?
AI: Probably the simplest is a simple zener limiter:
This will also limit negative voltag... |
H: 8 channel 5v relay
I bought an 8 channel dc 5v relay module for Arduino from an on-line store. When i power on my system, the modules become really hot.
My connections are,
Vcc to 24vdc
Gnd to ground
In(1-8) to the digital outputs of my arduino.
Everything seems to be connected correctly. Another thing, when I ... |
H: What causes components to "jump" during reflow soldering?
I've been using a hot plate technique (with a PID controller / thermocouple / SSR setup) to get into making SMD boards. I had an interesting experience earlier today, and I was hoping some more experienced individuals might be able to help me understand what... |
H: Replacing SMD Fuses without access to schematics
I'm curious to know if there is a sane way to determine the specifications of a blown SMD fuse without resorting to manufactures schematics / repair manuals.
In my particular case there are no obvious markings on either the board or the component (naturally).
AI: No.... |
H: Should I isolate grounds of an isolated DC/DC converter?
If I use an isolated DC/DC converter, when designing the PCB, should I isolate the ground of the input and the ground of the output as shown below?
I've never isolated grounds (except for AGND and DGND) but always used one single ground plane for the input a... |
H: What are these banana plug connectors used for?
These mate with one another (in the obvious male-to-female chain). They seem to be male-to-female banana plug adapters. Maybe I am being naive, but these seem useless. What are these useful for in practice?
EDIT: They do not come apart, i.e. they are not banana plugs... |
H: How to use the LEDs on Sainsmart protoshield
I have an Arduino Uno with a top-plugged SainSmart proto shield. There are 2 LEDs on the proto shield, but I don't know how to make use of these LEDs in a sketch. Are they directly controllable out-of-the-box, or do I first need to solder the LED leads to analog/digital ... |
H: Finding the current flowing in parallel circuit
Lets say we have a circuit with a voltage source and a 5 ohm resistor. The voltage source is 20 v and so the current flowing is 4 amperes (according to ohms law). Now, we add a short wire in parallel to the resistor (you can think of it as having a resistor whose resi... |
H: Unbalanced three phase system - Neutral fails/opens/disconnects - consequence?
I have a very basic question about three phase system. I am not an electrical engineer hence I might not have a good understanding of the subject. So, please be bit lenient in answering and asking clarifications.
My home receives a 220v ... |
H: Interfacing HEDS 9700 optical encoder with AVR atmega32
I'm trying to interface an HEDS 9700 optical encoder using an HCTL-2020 IC (or anything else) with my Atmega ( atmega128, atmega32, atmega16, atmega8 or any AVR-family based microcontroller, don't matter for me ).
But I don't know what should I do. I read dat... |
H: SPI Flash: Half the bits are zero
I have an STM32 driving two very similar SPI Flashes, an N25Q and an M25P.
Strangely, while my driver copes with the N25Q perfectly well, the M25P is only "half" working. What happens is that when I write a page of bytes, and read that page back, the four MSB bits of each byte is 0... |
H: Recommended placement and routing of an RC Low pass filter
What are the recommended placement and routing techniques for the following RC low pass filter circuit:
I made an initial placement and routing that's shown below:
Actually it's randomly placed and routed because I don't have any recommendations.
Thanks.
... |
H: miniDIN - style connector with many pins
I'm looking for circular connector with size of mini din with so many pins as possible. I'm building embeddable controller for Roomba vacuum cleaner robot, and I want to led as many pins as possible from microcontroller through this connector.
AI: The maximum pin number you ... |
H: Help Identifying Non-Standard USB Connector
I need help in identifying a part and finding a source (if possible) for a non-standard USB connector... at least I believe it to be non-standard. I've attached a few pictures which are focused to the best of my abilities.
The connector measures approximately .200" x .08... |
H: Sound card CD audio in connector
The typical name I see given is MPC, MPC2, or MPC-2, and the cables are readily available, but I can't seem to source the female PCB-side connector. Obviously, a 1x4 pin header would work just fine, but I'd like to use the locking connector if possible.
This is what the cable looks ... |
H: How can I use a transistor as a switch?
I'm trying to drive a DC motor using an external voltage source and control it using a transistor switch. It doesn't seem to be working during the simulation though. I know I must be doing something incredibly stupid.
I have it built in circuitlab here.
Thanks
AI: Maybe what ... |
H: Information on this keypad
I receieved this 4x4 keypad in an electronics kit, but don't know what the pins (it has 2x5 pins), are, and can't seem to find a data sheet for it.
Any info or help is appreciated!
AI: Using the following keywords in a search engine> 4x4 keyboard 10 pin
One quickly finds several solutio... |
H: Need 1-4 pins controlling 16pins logic level
I have max four outputs coming from a PIC. I need these four outputs (or one serially) to simultaneously control 16 pins with a logic level. This is for a clock application.
A BCD could accomplish this but I don't believe it is the correct way and no one stocks them.
A s... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.