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H: Positive Edge Triggered D-FF by switches
if Given that this circuit implements Positive Edge Triggered D-FF so What is the purpose of the switches S2 and S4? Hwo can i know what is the kind of S2 and what is the kind of S4 (P or N)?
AI: A flip flop is two opposite phase latches back to back.
A latch consists (in t... |
H: Dielectric Mirrors?
What common electrical product(s) have dielectric mirrors integrated in their design? I once asked a question on the Physics.SE about alternatives for a Faraday's Cage in order to "shield" leakage of EM radiation, and a person on the site said dielectric mirrors. I researched and found out how... |
H: opamp, ADC, level shift problem
I have an input signal with an amplitude of a few mV that I want to filter, amplify and then feed to an ADC ("Analog Signal").
The input signal (Coming though C1) is lifted at 2.5V and the range of the ADC is 0-1.25V. The ADC has a reference voltage pin of 1.25V (it's the LTC2470).
U... |
H: What were gate length of early SSI circuits?
Just curious about early IC history. Wikipedia tells about IC nodes starting with 10 micron, but I'm curious what people produced before that, in 1960s.
AI: 1960s ICs generally did not have gates, as they were bipolar. NMOS, PMOS and CMOS came into their own in the 70s. ... |
H: Are these 12v power supplies worth using? Is additional circuitry needed to drop voltage to meet USB standards?
I have these two power bricks I want to convert one of them to power a Banana Pi and 3.5 HDD.
https://i.stack.imgur.com/KHQUA.jpg
I want to determine if either is safe and the needed circuit modifications... |
H: Why do I need to keep Led drive and photodiode ADC supplies and traces separate in a pulse oximeter design
I've seen a couple of application notes recommend keeping led drive supply and ADC supplies separate.
To me it seems that since the LED will illuminate the photodiode that ADC is reading anyway, keeping this ... |
H: TM4C123, only one timer works at a time?
I am using TivaC TM4C123 MCU. I am trying to send data serially through one pin and a synchronized clock through another pin. Here is an illustration:
I used Timer0 module for the serial data and Timer1 for the clock. The frequency of the clock should be twice the data. Her... |
H: What's the difference between all of these video inputs?
Over the years and with the large variety of hardware I've dealt with I've used quite a few of different video inputs and outputs. While I usually have no issue just plugging cables into devices, I really started to wonder how video cables differed from each ... |
H: High side switch and Low side switch
I wonder what is the difference between high side switch and low side switch. Basically it work the same way (electrically speaking) but I don't know if one is better than the other. Is there any safety purpose? What is the best solution if there is big capacitor in the circuit?... |
H: Reading 2 Quadrature encoders using a single Arduino Due
I am working on an autonomous robot in my summer vacations. I am currently working on running the motors of my robot in a closed loop. In order to do so, I have to interface two Quadrature encoders of the motors with the Arduino Due that I have. My motor enco... |
H: How to write an efficient C code for a firmware
This question is about programming but as its about programming electronics so I thought of posting it here instead of stackoverflow . I have just started my electronics projects. I have designed two applications and have done their hardware and firmware part myself. ... |
H: Problem with connecting Nano v3 to Sharp Proximity Sensor
I am trying to connect a Sharp Analog IR Distance Sensor GP2Y0E02A to a nano v3. It accepts 2.7 - 3.3 v so I have it connected to 3.3 v from the arduino but I dont get serial output, just complete blank. When I change the code to something a little similar (... |
H: 3.3V Supply using lipo
I'm trying to design a supply circuit for a board that should deliver 3.3V using a LiPo battery, the battery should be that charged using a micro USB cable.
here is what I've done so far.
the LM3940 regulates the supply voltage to 3.3V and the MCP73831 is a battery charger. the Target voltag... |
H: ATtiny power consumption with clock prescaler
I'm designing a battery-powered radio-linked sensor device which requires a long lifetime. Due to the project requirements I have very little onboard energy to work with; a single coin cell is the likely source and the lifetime requirement is at least a week.
My primary... |
H: what kind of OS is present inside 'mbed'?
mbed seems to be a good place to start a new project on ARM. And they are saying that there is an OS inside. Is that real time (RTOS) ? is that capable of multi tasking and inter-task communication ? is there any comparison with FreeRTOS ?
AI: From the release note for vers... |
H: Choosing the right FET to switch between two sources
The circuit below is based on the answer to this question, which i find to be suitable for my application.
3.3VDC is the main supply for the circuit, with 3.6V 1/2AA battery for backup, as defined by the product requirement. The load is basically three switches... |
H: Extra bare wire in USB cable
Whilst cutting up a USB cable for a project I noticed this extra bare wire within the insulation. Now I'm assuming the foil is shielding of some sort, but do I need to connect this bare wire to ground? Or should it be left disconnected?
AI: That is the drain wire that helps carry charge... |
H: How does current work in hubs?
Okay, I'm a total noob and don't know if I'm even wording this question correctly, but I'll try.
My understanding is that the power supply (an USB power supply in my case) determines the current. I have a 2.5A 5V supply, and a USB-to-DC cable that connects that power supply to an USB ... |
H: Reusing an 8 bit microprocessor? (86CH09NG)
I salvaged some parts from a microwave and I am wondering if it is possible/ feasible to reuse the 8 bit microprocessor on it? I am also not sure if I found the proper datasheet for it? (link to datasheet)
AI: ROM (MaskROM)
Nope.
Well, yes, but only for what it was alrea... |
H: How much time needs a 1.5 kW solar panel to charge a car electric battery?
Tesla car battery has about 6000 li-ion batteries. Each rated 3.7 V and 3500 mAh.
I asume ten 1m2 solar panel, each gives 150 W at 12 V (this gives about 12.5 A). For this problem, I put them in parallel, so together they give 1500 W, 12 V a... |
H: Using 16 x 4 Alphanumeric LCD with MikroC Pro for PIC compiler
I am trying to interface a 16x4 LCD to a PIC16F877 MCU. The project is just a digital clock showing date and time from a DS1307 RTC.
The display works correctly when I use a 16x2 LCD. But if I try to print the same thing, same code in the 16x4 LCD's 3rd... |
H: "Reverse etch" PCB base(not the copper)
Is there a reliable way to etch a PCB(from working product) so as to be left with the surface without the substrate?
Sometimes an existing PCB product which wasn't designed with weight, size or flexibility in mind is to be reworked.
Looking for a good process to address tha... |
H: Servo-amp vs Monolithic
In the realm of audio what are the differences between servo-amps and monolothic amps? Are there any performances criterion that might make one more favorable to another--gain, noise, ease of implementation, topology, THD, etc.
AI: what are the differences between servo-amps and monolothic a... |
H: High current, low voltage switch
I have a serious hobby coilgun project powered by a 6S (25V) LiPo Battery. Currently i have the LiPo, capable of at least 600A burst current connected to a ~75mOhm circuit for some 300+A of peak current. I have built said system with a Mosfet switch (AUIRFB8409 ~1.4$ each from AliEx... |
H: LED Cube - Drain Current Resistor for MOSFET Switch
I'm an electrical engineering student trying to build an 8x8x8 RGB LED cube as a summer project. Currently I'm designing the portion of the driver circuit that controls the anode layers of the cube. I have 8 individual MOSFET Transistors that I'm using as switches... |
H: Understanding when certain components need a lower voltage
When looking at electronic modules to buy (WiFi, sound etc) many descriptions say that the module cannot use a 5V input. But the 5V supply can be used if it's stepped down to 3.3V (or whatever is needed).
What I don't understand is that when I create a ser... |
H: Which is better, single inverter or buffer + inverter?
I am trying to make a circuit that inverts a scaled (resistive divider) voltage using op-amps. I have come up with two ways to do it, but I'm not sure which one is better and why. I'm not particularly worried about saving cost or components, so which one of t... |
H: How to pick correct operational amplifier as unity gain buffer between TLC1543CN and LDR
This is a follow up question on: Interfacing TLC1543CN adc with 8051
I have a LDR in voltage divider circuit. The resulting varying voltage is outputted to adc. Which in turn passes the converted signal to 8051. Lastly the LDR ... |
H: Will this AM radio receiver work?
What I'm essentially trying to do is to add an amplifier to a simple passive radio receiver:
simulate this circuit – Schematic created using CircuitLab
XFMR2 consists of two inductors 0.4 uH and 730 uH. C3 varies between 35 and 235 pF (or something like this). Numbers and the whol... |
H: Converting Proteus PCB to Altium PCB file
Hey all I am converting a Proteus PCB design into Altium and I am wondering what each file is since it asks me in Altium.
My Proteus files are:
And this is what Altium does when I do a PCB Design Check/Fix:
And so I say Yes and I am presented with this:
And this is where... |
H: Calculating power measurement error from V and I error margins
I am using a Yokogawa WT310 for measuring DC power. The manual (available here) says that both current and voltage have accuracy of +/-(0.1% of reading + 0.2% of range).
Assume this example setup:
Input current: 700mA
Current Range: 1A
Input vol... |
H: How to configure a relay to operate as a transistor?
We have a FINDER 40.51.9.012.0000 relay, with this scheme:
I want it to operate as a transistor, in the sense that a signal can control the connection of two other lines (i.e., the collector connects to the emitter only when there is 12V on the base).
According ... |
H: node analysis with current source
I have the following problem to solve. I wanna find the current through R1 so i did a node analysis on this circuit. This is what i got so far:
I2 = I1 + I3 (I2 being the current going through R2 etc)
I2 = (VB - 0)/R2 (VB being the node between r1 and r3)
I3 = ((VB - 0)/R3+R4)+I
I... |
H: Slotted Optical Switch (OPB992T51Z) anode and cathode connections?
I have an optek Photologic® Slotted Optical Switch. It is meant to turn off when the near infrared emissions (850 - 940nm) are blocked.
It has five wires as follows:
I am unsure about what to do with the anode and cathode, (most likely connect the... |
H: AT-Commands: Send E-mail with attachment
I purchased a telit GSM Click (GL865) to use in my project. The architecture is composed of PIC based board with two MikroBUS connectors, I used one for the Telit GSM click, and the second one for the SD card.
I interfaced the Telit GSM Click correctly.
I interfaced the SD c... |
H: Tube amp: What do these resistors do?
This is a schematic for a very simple guitar pre-amp. I understand the basic amplifier architecture except for those two 33k resistors in the middle, combined with the 220nF capacitor. Any ideas as to what those are for?
AI: It's (capacitively coupled)negative feedback so the... |
H: Can I control a load of 12v DC with a solid state relay 24-380VAC?
I need to control a load of 12v DC and 30A, Can I control the load with an AC solid-state-relay 24-380v and 40A? If it isn't possible, what should I use?
Thanks.
AI: No you can't.
Figure 1. The SSR-40 DA.
I need to control a load of 12v DC and 30... |
H: How to alternate 2 LED strings using 555 IC?
I have one sensor that goes on/off at times, I want to flash 2 LED strings (RED, GREEN) every 1 second using a 555 IC.
So when sensor ON
1st second GREEN-ON,RED-OFF
2nd second GREEN-OFF, RED-ON
the 555 IC can sink and source, do I use a P and N channel MOSFETs to drive t... |
H: Arduino pmos ZVP2106A as switch
I've got some ZVP201A PMOS transistor and I want to use one as a switch to control a little 5V 110-150mA light bulb with an Arduino. Here is my schematic:
Is it correct? Is the ZVP201A the right transistor for my application? The 10k pull down resistor is really needed? How can I ch... |
H: How does the Intel 8086/88 know when to assert the IO/M signal?
Consider an Intel 8088 processor with a standard, parallel RAM and ROM implementation that also supports address/data bus access to various external peripherals like analog-to-digital converters (ADCs), UARTs, and more.
I'm having trouble designing a c... |
H: How to quickly distinguish DO-35 Switching diodes and Zener diodes
I do not have a magnifier glass handy. And many a times I saw Diode Numbers get wiped out after reusing the diodes. Is there an easy way to distinguish between DO-35 packaged Switching diodes like the very popular 1N4148 and 0.5Watt Zener diodes usi... |
H: charge pump doubler
I am not fully sure as to how this circuit works. I know that during the positive half cycle D1 is on and C1 charges to V volts, and that during the negative half cycle D1 will become off and D2 conduct. So some charge flows from C1 to C2, keeping C2's voltage at some level until the next negati... |
H: How do I create the layout for this rotary encoder on a pcb?
I am very new to designing boards and I am trying to do a board layout that contains a MODEL EN11-HNM encoder but I am not sure how to handle the tabs that provide the mechanical strength while it is on the board.
I have laid out the three pins as it sho... |
H: Using mosfets to switch between two thermistors
I've got an Atmel ATmega328P and I'm trying to run two thermistors into one analog pin (TEMP_M5), using a digital pin to select which thermistor is active (TEMP_SEL_M5). I thought the circuit below would let me do that, but I've breadboarded it and while the right-hal... |
H: What is this symbol that looks like a parallelogram?
it says "180ohm at 100MHz" next to it. So I'm guessing that it's a non-air-core inductor. It seems to fit this: What is this symbol on the schematic? - except that the symbol is slightly different than what's in that answer. Wanted to confirm.
this is part of At... |
H: LM2596 buck converter overheats converting 36DC -> 5DC at 600mA
In my circuit I'm using an assembled LM2596 converter module (those which are like $2 on ebay). The input voltage is 26V AC (current 140mA), which is rectified (making it ~36 peak DC), and feeds the buck converter. The output is 5V DC, 600mA. All seem ... |
H: Why does the opamp output voltage saturate?
simulate this circuit – Schematic created using CircuitLab
Vout = Vin (1 + R2/R1) According to this positive feedback topology - made an error here, it's Vout = Vin(-R2/R1) (edit)
Now I read in a tutorial - http://www.electronics-tutorials.ws/systems/feedback-systems.... |
H: Microcontroller not working as expected or crashes after a few days
I am using Atmel AVR ATmega8 in my monitoring project, which measures three phase voltage and sends data through a uart. It works great in 1 or 2 days. But after that amount of time, it is not working as expected, and no response comes from the uar... |
H: LM2576 output voltage error
In my earlier post, I was using LM317 for SIM900 but due to some voltage drop problem, I decided to go with LM2576. I am trying to step down the voltage from 12v to 4.5v using LM2576. I have studied the voltage calculation formula described on page 21. For the time being, I am just testi... |
H: Is the self-powered USB hub powering my devices?
I bought a cheap Hub for powering my 5 arduino(s). It has an AC wall power adapter. Can i determine if it actually powers my USB devices and what amount of current per USB port can deliver?
The USB hub has one LED, that lights when i power it with the AC adapter, an... |
H: Fixed 5V regulator circuit LM1084
I am building a circuit using a fixed 5V LM1084.
All the circuit diagrams in the datasheet seem to be for the adjustable configurations. To used the 5V fixed should I connect Adj/GND pin directly to ground?
AI: Yes, you connect the ADJ/GND pin to Ground aka GND for the fixed-output... |
H: Condition for absolute stability
A necessary condition for absolute stability of a system is
Gain cross over frequency < Phase cross over frequency
Where Gain cross over frequency is the frequency at which Gain = 1 or 0 dB
Phase cross over frequency is the frequency is the frequency at which phase = -180 deg
Can a... |
H: serie parallel RLC circuit current
I got a problem with how to calculate the current going through R and L in this circuit.
I have calculated the following.
Xc= 79.6Ω at -90°
Xl = 251.3Ω at 90°
ZRL = 128.8Ω at 30.8° (R||L)
ZT = 111.48Ω at -7.03°
Vc = 10.8V at - 83°
Vr = 17.33V at 37.83°
Total current(IT): 0.135 ... |
H: two way switch for a bulb circuit
how to install a wiring where I can have two switches the two switches will turn on a bulb
I have to turn on the light if any of the switch is on and I have to turn off the light if any of the switch is turned off
can you suggest me a way to install such a mechanism thanks in advan... |
H: Maintaining voltage at 5V, but voltage must be able to change
Okay so I'm a beginner at electronices not sure where to begin looking so I'm just going to ask, is there a way to maintain voltage at 5V but it must be able to change to below 5V.
Basically, I'm hooking up an output from a sensor and going to connect it... |
H: How to calculate telescopic antenna impedance?
I'm designing a 27 MHz transmitter for controling RC toy using TX-2B and RX-2B ICs. Thre is my output stage schematic (see attachment). Output impedance 50 Ohm. I know that antenna length on 27 Mhz should be l (wave length)/4 = 2,77 m (quarter wave antenna) and impedan... |
H: Do the statements "circuits/components will only draw the current they need", and "V = IR" contradict?
What I'd like to know is how we can resolve the two statements, "Circuits/linear components will only draw what they need", and "V = IR". They seem to contradict one another, in my view. With a given voltage and a... |
H: Measuring temperature using resistance termometer Pt100
Given:
voltage source \$U_0\$ = 1.2 V
\$R_i = 1000 \Omega\$
\$Pt_{100}\$ is described by \$\Delta\delta=T-T_0=0°C\$ with \$R_0 =100 \Omega\$ at \$0°C\$
\$R_1 = 500 \Omega, R_2 = 50 \Omega\$
Asked:
Calculate the \$I_{out}\$ at the amplifier for \$0°C\$ and... |
H: Why 7805 regulator gives output 6 volt?
I am using 7805 and 7815 for the voltage 5 V and 15 V respectively. I provide 24 V to 7815 it is giveinng me output voltage 18.5 V instead of 15 V. According to 18.5 V to input to 7805, its output is 6 V. It should have to provide 5 V output. similarly, the output of 7815 sho... |
H: Translating a 1.8 V FPGA pulse to 24 V pulse to power a solenoid
I am designing a board that will interface between a FPGA board and solenoid that powers a pneumatic system.
The signal coming from the FPGA is a LVCMOS 1.8 V signal. Current from the FPGA signal is approximately 10 mA. I desire the output of the des... |
H: Why isn't the switches being bypassed in this triac/diac circuit?
Just when you think you understand circuits, there's always a curve ball to derail you and leave you scratching your head.
The diagram below is a Triac/Diac speed controller for a reciprocating saw. At the top of the diagram, you'll notice there is ... |
H: Emitter follower regulator with sziklai pair, transistor heating up!
I have a wireless chip esp8266 that requires input voltage of 3.3V and can draw current up to 500mA.
Unfontunately at the moment I don't have any 3.3v regulator IC's or buck converters or any 3.3v voltage source, so as a temporary measure (until m... |
H: Most efficient circuit for 2048 Bit multiplication, and how to effectively render it
So this isn't for a hardware application, but I still think it will be extremely relevant to those that are chip designers/EE enthusiasts.
I'm attempting to do some analysis on multiplication viewed as a boolean function. For this ... |
H: bandwidth of digital control design in conventional dc-dc converter
I designed conventional single inductor two output dc-dc boost converter in psim. This means inductor energy is stored and thrown to 1 output at one cycle and charged and discharged to the 2nd output at next cycle. The two outputs are sensed by u... |
H: Is a Karnaugh map always a good way to simplify a Boolean expression?
I want to simply the following expression:
(NOT A AND NOT B AND NOT C) OR (NOT A AND B) OR (A AND B AND NOT C) OR (A AND C)
I created a truth table first, then a K map from the truth table. (See below.)
As far as I can tell, the simplest express... |
H: Why did my Gameboy shut off during takeoff?
When I was young I remember playing my Game Boy Advanced SP in the airport terminal. When we boarded we were asked to shut off all electronics. I was setting a high score in Pokémon Pinball: Ruby & Sapphire, so of course I left it on. During takeoff, it shut off. I checke... |
H: blink a led 10ms every 1 second
I am currently looking at generating a signal to blink a led with a 10ms duration every 2 seconds. I was thinking to use a 555 timer to do so, but I don't see how to change the duty cycle to make that off time is different than on time.
I want to avoid the use of an MCU if possible t... |
H: Packaging polarity indication of a supercapacitor (polarity indicated by arrows)
I obtained some supercaps from an auction site.
As is often the case for low cost components from such sources, these do not have supplied data and such branding as there is does not appear traceable.
I would like to know if there is a... |
H: Using microcontroller's ADC to measure the voltage between LiPo cells
What I want to do is to measure the balancer output of a 3 cell LiPo, and if any cell drops lower than 3V I want to put my uC in the shutdown mode. Gonna be using STM32F401RET6.
First question is: is it actually a good idea to do it this way, or ... |
H: What power in outlets forces electrons to flow back to anode in batteries?
title pretty much says it all...
I completely understand how battery works (because its simple right?).
But I´m little confused about recharging part... I understand that when you plug battery into the outlet you force electrons to flow back... |
H: How to Create a Simple Speaker Driver After LMC555 with Low Pass Filter
I created a very basic sound generator which ends in a LMC555 which plays a melody in the frequency range between 440Hz-880Hz. Now I struggle with the speaker driver. I would like to use very basic components like transistors and MOSFETs and no... |
H: Why is Vbc absent from bjt equations?
In BJT biasing the voltages Vbe and Vce are always present in calculations.
Is the voltage Vbc absent from any equation because one of the collector, base and emitter is grounded or any other reason concerning the theory of semiconductors?
AI: You are incorrect in your titled ... |
H: Do simple LED strip dimmers consume power while turned off?
I am referring to this kind of LED strip dimmers:
I want to know if it consumes power while the LED strip is off, and if so, how much.
AI: Yes they will. It may be a few milliamps, or even less, in the microamp range, but they will as the microcontroller ... |
H: DC to AC conversion and filter wave shaping
My question refers to checking concepts.It's a scientific one,so I am not looking for a way to make a DC to AC power supply for a device because its charger broke or something similar.
The goal is to convert the output of an astable multivibrator into a sine wave that can... |
H: circuit analysis to find current and then voltage across resistors
This was one of my assignment questions, I am on it since last 3 hours but not able to solve it. Here the source voltage in the circuit shown in Fig. is 100 V.
I need to find reading in each meter. I don't know what I am doing wrong in applying KVL... |
H: Rotary Encoder Schematic Symbol
I want to create a part in Eagle for Bourns PEC16 series rotary encoder. I can follow online tutorials, but I'm not sure what the standard rotary encoder symbol looks like. Is there a diagram or specification I can follow to make the part more useful?
AI: I am not aware of any standa... |
H: Smooth and no-flickering dimmable light source
My goal is to record a video with a varying intensity light source.
No flickering at any frame rate (frame rate 30 60 120 240) while watching frame by frame, not human eye.
Smooth dim level
Any type of lamp is OK. (DC powered is preferred)
Dimming by voltage controll... |
H: A query regarding thermal voltage V = KT
I read that thermal voltage = KT ; K in ev/K and T in Kelvin.
By substituting we get V = 8.620 * 10^(-5) ev/K * 300K = 0.0259 ev
But where ever I read, thermal voltage is given as 26 mV but it has to be 26 milli electron volts, right?
Can you please clarify this?
AI: Yes... |
H: Annotating a schematic in Altium
I'm trying to annotate a Schematic project in Altium, my aim is to get, for example, in the 1st sheet : C101. C102 R101 and so on , in the 2nd something like : C201 C202 L201.
I've been trying in vain to do that.So I've decide annotate each sheet alone(Not the whole project), but t... |
H: How to lock one (or more) layers in Eagle?
I am designing a PCB using Eagle software, and the PCB has a specific shape. The shape is little complex so that it includes a number of curves, and it is really impossible to move the shape segments (layer-dimension) one by one.
But 'block' command is also hard for me in... |
H: Home-automation standard for custom devices
I'm willing to build my own home-automation system (at least partially). I haven't chosen the protocol yet.
My goal is to make home-automation devices that would be compatible with controllers/software and other devices on the market.
For example, I could create a device... |
H: When load increases in rotor of induction motor how does stator draws more current?
When load is increased in the rotor , why does the stator draws more current since the rotor is short circuited. How does mechanical load increases the electrical current flow....
AI: The current induced in the rotor creates a magne... |
H: Calculate total impedance in circuit with series RL in parallel with C and R
Hi im trying to find the total impedance in this circuit but im having troubles figuring it out. I have calculated the individual impedance for each branch like following:
Xc = 46.8 ohm at -90 degrees
Xl = 46.8 ohm at 90 degrees
ZR = 1000... |
H: Generating a sine wave from a square wave, for a large frequency range
I have a PWM output from a micro controller. I want to turn this into a sine wave.
The typical way to do this is a low pass filter. Unfortunately, I want to change the PWM frequency, and the corresponding sine wave frequency, over more than a ... |
H: How exactly does a point-contact razor blade diode work?
The original foxhole radio used a razor blade with an oxide layer and a makeshift cats whisker to form a diode. How exactly did this makeshift diode work? Is it actually a P/N junction, or does it work through some other principal?
AI: Buried in the Wikiped... |
H: Linear Circuit Analysis: Source Transformation of DC Network
The 1st (upper) picture is the given problem. The 2nd (lower) picture is my attemps to the solution.
I neglected the middle resistor in bridge circuit, resistor in parallel with voltage source, and resistor in series with current source. But now I'm st... |
H: When I need an RF sampler
I have a raspberry 3 which can transmit 150mW max. I would like to connect it to my oscilloscope. Is it necessary to use RF sampler?
AI: Unless you have an atypical oscilloscope or an RF transformer in there, the low voltage rails of the pi mean the amplitude of the pi's output is probably... |
H: Clock signal from Atmel ATMega chip
I am not sure this is the right place to ask this question, but did not see any communities dedicated to Atmel chips.
I used a scope to look at my atmega328 clock signal (pin 14) and got the following result.
I expected a square wave, not a notched sine wave, but I have no basis... |
H: Setting heat on electric stove
This may sound like a strange question, but its bothered me for a while:
I assume electric stoves (the ones with the coils that get red hot) work just by having a resistor that gets hot. If it's getting hot, then it must be using a lot of power so it would be pretty low resistance, bu... |
H: How to connect same signal pads in Package Editor in Eagle?
I'm trying to make a circular pad for a project:
To try to make my life easier when changing inner and outer diameters I created a package which consists of 2 pads: one horizontal, which connects one "fin" to the next one, and a vertical one, which is the... |
H: PIC32MX ICSP wiring
I was looking to use a PIC32MX series microcontroller on a project. It is currently in the mail, but I thought I would try to understand the wiring for power and programming before it arrived. I had planned on using a PICKit 3 to program the device over the ICSP line, but I'm having some trouble... |
H: Why the constant of integration in pure inductive is zero, while deriving an expression for current?
I think it should not be zero but should depend on the physical quantities... Basically it should be circuit dependent
AI: It isn't necessarily zero.
Consider this circuit:
simulate this circuit – Schematic created... |
H: adapting 60 LED battery operated string-light to work with wall wart
I need to adapt one of these 60 LED string-lights to be powered through a wall plug. These are micro LEDs all wired in parallel; sadly, I couldn't find specs for this kind of LED. The string's power supply holds 6 AA batteries (3 parallel-wired-pa... |
H: Include board margin in PDF output
I'm designing a flex PCB to place on the back of a human hand and I need to print it out once in a while to compare the shape. In the output job file I have included the PCB printouts under Documentation but I can't seem to find any layer corresponding to the board margin.
AI: Tur... |
H: Bi-directional energy meter
I have a question regarding reading import and export energy from an electricity meter, the system has a solar array fixed allowing power to be exported to the energy grid when there is excess power.
The link to the energy meter I am interested in (CL model), is below:
https://www.accuen... |
H: ESD Diode - GPIO Microcontroller
I need to protect my GPIO from Electrostatic discharge as my inputs are coming from outside.I am using LPC2132 Micro controller which uses +3.3V Supply.Bidirectional ESD diodes that I have seen so far has maximum clamping voltage 0f 7V. Since the micro controller does not withstand ... |
H: USB power isolation
Here is the USB to Serial portion of Sparkfun's Stepoko board. Can anyone help me understand why the USB power is isolated from the +5V which is a separate onboard supply powered by an external supply? Nothing except the FT232 is powered by the USB. Hence would it be ok to just leave the F_SMALL... |
H: Rs232 connection to gyro, uC and PC
I have a question regarding RS232 communication between a VectorNav VN-100 Gyro, Mbed LPC1968 uC and PC. I am using gyro to measure the number of rotation and processing it in the uC and displaying the number of rotation on a seven segment display. here is the top level diagram o... |
H: Counter in VHDL
Designing a counter mod60 in VHDL, I realized that something strange happens, but I can't explain why.
This image shows the moment of the transition from 59 to 00 (numbers converted to a 7SegDisp):
The code for it is:
ENTITY Contador IS --"Contador" means counter
PORT(
clk: IN BIT;
... |
H: Can connecting of AC adaptor first into device, then into mains pose a risk of voltage spike?
Manuals of several various electronic devices I came across recommend connecting their AC adaptor first into the device, then into mains. I always thought the reverse order is safer because I thought that connecting into m... |
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