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H: ESD capacitor simulation for human body model
I have designed an ESD suppression circuit with the help of ESD capacitor using LTspice. In the circuit, 15kV input pulse is given to ESD human body model and the resistor, capacitor used near the source are as per the standards.Capacitor C2 value is calculated as per t... |
H: Understanding of class-AB currents
I am trying to understand a simple class-AB output stage. The bias voltage for the transistors is made by using two diodes. The following picture show the circuits. The currents drawn are how, i believe, the currents will flow.
I want to understand the currents, to be able to fin... |
H: Simple Op-Amp setup for current sense has a strange working range
I am using a LM358D dual amplifier at the moment and my goal is to measure over-current on 2 motors. Before I'll be doing that, I made a test setup to test the equations and check the output signal of the op-amp. The gain is set to 100 with standard ... |
H: Trigger input with varying input voltages
Currently I am trying to build a circuit, with the goal of triggering a pin of an ESP8266 from varying input voltages (in the range of 5 to max 15 volts it should get triggered). Also the input should be seperated from the ESP.
What I was thinking to do was:
Use an optocou... |
H: What PCB Plating do I need to use Exposed Copper Pads with Pogo Pins?
I am designing a PCB that will have some Mill-Max pogo pins make direct contact with exposed copper pads on the PCB. This will have many connects and disconnects, think hundreds to thousands.
I know that it needs to be at least gold coated in ord... |
H: PA92 OPAMP phase compensation
I'm having trouble to understand the phase compensation on the PA92 opamp. First I'll explain quickly the circuit I'm building.
1. The circuit
I'm using a 200V battery and would like to create a virtual Gnd for my circuit. The PA92 OPAMP is the ideal component for that, because it c... |
H: How is the extinction angle for a half wave rectifier with RL load calculated?
I have a couple of notes about the half wave rectifiers with the RL load, but I dont quite undestand how is obtained the extinction angle \$\beta\$ ?
simulate this circuit – Schematic created using CircuitLab
Questions
\$I_{ODC}\$,\$V... |
H: Same serial command, different serial replies
I have a device (a traffic counter) that communicate with my computer throught Serial Port.
To extract data from this device, I use a specific software. I'm also using a Serial Port Monitor to check what is written on the serial port and what is the serial answer.
So ... |
H: Using a voltage divider with buried zener voltage reference
My plan in the below circuit was to use a voltage divider from a Max6225 2.5Vref, to get 2V and 1V from it in order to use the full 16bit bipolar scale of the ADS1115s, but I'm getting strange resistance readings from a DMM across the resistors - can I use... |
H: Identifying FR-4 and G-10
I am evaluating a couple products -- lighting ballasts -- and noticed one of them seems to use G-10 as the PCB laminate. I assume that the beige, solder-mask-free top layer is the clue.
Top:
Bottom:
Given that FR-4 is Flame Retardant, whereas G-10 is not, I prefer to stay away from the ... |
H: Why use RMS instead of the average voltage of half the cycle for power
In a AC sine wave, the RMS voltage value is \$\frac{V_{p}}{\sqrt{2}}\$ where \$V_{p}\$ is the peak voltage whereas the average voltage value over half the cycle is \$V_{p}\cdot \frac{2}{\pi}\$
If we take the average of the entire sine wave the r... |
H: Can I touch voltage?
After watched this man this man, I have some questions.
He touched 170 VDC, what is max DC voltage can I touch when I dry? And wet?
What is max AC voltage can I touch when I dry? And wet?
Is using 'diode bridge' convert dangerous 50 VAC voltage to safe DC voltage?
120 VAC @ 60 Hz vs 12... |
H: Exactly what type of resistor is being referred to in this diagram?
I'm trying to control an RGB LED strip using a NodeMCU. I have been following the guide linked here. However, the diagram included in the diagram is rather unclear, especially for someone like myself who is new to electronics. This is the diagram:
... |
H: When are fiducials needed?
On a single-layer board with no through-hole and no machine placed components, is there any need for fiducials (for example to route the board outline)? Board house has asked for permission to add fiducials to gerbers. Of course I will say yes, but I am surprised. I definitely don't need ... |
H: Does non-matching impedance of amplifier and speaker distort the sound?
I'm about to buy a pair of headphones and an audio interface with built in amplifier. The specs say that the amp's impedance is "<30 Ohms".
The headphone I'd like to buy is a Beyerdynamic DT 990, which has versions of different impedance.
I'm o... |
H: Why does this DC motor have such a wide range of power?
This DC motor has a power range of 9.0W-300W, while its voltage range is from 6 to 20 volts. Does this mean that its internal resistance is somehow dependent on the load? Or does the user determine the actual power with using a resistor in the circuit?
Perfo... |
H: Negative Voltage Generator for Low Voltage ( +1V ) Input
I am working on an analog circuit. I can only use a +1V power supply. My design requires a negative rail, so that my level shifter will work.
Attempts:
I have already seen Build Your Own Negative Voltage Generator
and I cannot use this because a diode woul... |
H: Why does a Solenoid driven with intermittent duty cylce produce higher force than with continuous drive?
I'm selecting some solenoids with my MechE and I noticed something that I didn't have an intuitive explanation for.
We were looking at this solenoid and noticed that at the bottom the forces available were high... |
H: Solvng transistor circuit
The transistor circuit in shown in the schematic I have included:
simulate this circuit – Schematic created using CircuitLab
I have tried solving it like this:
First I calculated the potential at node A by applying voltage divider law:
V(A)=(680/680+4.7)*20. The answer is 19.86V.
Now, app... |
H: Can I get away with that poorly designed board?
I am designing a board but space is not a luxury that I have at the moment, can I get away with that design or I must use a SMD resonator?
AI: You could "Get away" with a design like this. A good clock design keeps the traces as short as possible, and the capacitors a... |
H: Simple phasor problem with AC
Simple problem that I can't solve.
On this AC circuit, find the current read by ammeter \$ A_3 \$ (the one in series with the resistor) given that \$A_1\$ reads 4A and \$A_2\$ reads 3A, assuming every current is read by its RMS value.
There are no given values for resistor and capaci... |
H: Can't seem to make IDC connectors work
I feel a bit silly here. I managed to build a complex multi-board block of digital logic, but I can't figure out how to plug in a wire...
My plan was to buy a simple set of standard square-pin connectors, solder those to my PCB, and then connect to it with some ribbon cable. W... |
H: Choosing a motor to lift window blinds
I'm looking to raise my blinds every morning
using an rpi/Arduino and a motor. The blinds are lifted by a cord that loops near the bottom. I've checked that the cord requires about 20N force to pull down, and the gear turning the cord loop at bottom will have a diameter of 6 ... |
H: Getting Rid of Annoying Buzzing Sound from Multimeter
my multimeter has been bugging me with this buzzing sound that turns on and off while I'm using it. I think it has something to do with its autoranging feature, but I couldn't find the manual for this one and have a mind to get rid of the buzzing if it won't sto... |
H: Blue wire in logisim
I created this circuit and at first all the wires were green but when I copied it out of the main folder into another one, the wires turned blue. I've tried messing around with it and looking up what the problem is but I cannot find a solution. The exact same circuit was working before and I do... |
H: How do I identify a what kind of power connector for AC mains is on a product?
I see an AC mains input but I have no idea what kind of cable it goes to, how do I find the cable type so I can design around that? (Or conversely I have a cable and I don't know what type it is)
AI: Look for IEC320 reference tables, the... |
H: Why is it bad to have an inductive load (context: dc-dc converter)?
In the book I'm studying from Power Electronics - Mohan he says:
(...) has two drawbacks (1): In practice the load would be indictuve.
Even with a resistive load, there would always be certain associated
stray inductance (...)
This is in refe... |
H: Logic Level Converter (3.3v <-> 5.0v) returning HIGH for Low Volt. & High Volt. sides when nothing is plugged in. [Raspberry Pi]
The Goal
I have a Raspberry Pi that I'd like to control my treadmill with. The Pi's GPIO ports output 3.3v and the treadmill's motor control board only takes 5v signals. Because of that, ... |
H: 48VAC analog waveform
I want to make a circuit to drive out a 48VAC 10mA 60Hz sine wave signal.
I was thinking that I could generate a waveform with a microcontroller to feed it to an opamp then to a audio transformer
Would this work?
I wanted it to he handheld, so I was thinking about sourcing the circuit with ... |
H: How do AC adapters achieve low current?
The image above shows how a typical AC to DC adapter works, high voltage (230V) at low current is fed into the primary coil and then gets stepped down to a lower voltage with higher current, afterwards it gets rectified to DC and finally a capacitor turns this DC to pure DC.... |
H: Connecting a polyfuse (PTC / resettable fuse) without soldering
I want to connect up a polyfuse to protect a potentially flammable USB cable and a Raspberry Pi Zero in the circuit below. However it seems that most Polyfuses are supposed to be soldered and I'd much rather avoid doing that.
Is there any way to hook ... |
H: Can a short circuit in the output of a transformer be dangerous?
Assume that I have a 220 to 12 volts transformer with a nominal output current of 3 A (marked "12 V 3 A"). Now what does happen if I connect the two output wires to each other or to a load with very low impedance? Does the current exceed 3 A by a lar... |
H: What will happen when taps at secondary side of auto-transformer are connected together (short-circuited)?
In case of Auto-transformer, there is only one winding, having three lead wires (1 for primary/input, 1 for secondary/output, and 1 common between both). At the secondary side (the output side), there are taps... |
H: What to use to crimp a resistor onto 18awg wire
I want to crimp a resistor like the one below onto 18awg wire without soldering...
I've seen that bootlace ferrules like the photo below can possibly be used to do this but if I buy 22-24awg sized bootlace ferrules then the 18awg wire won't fit. And if I buy 18awg si... |
H: Non excited synchronous motor
I was looking for a synchronous motor for my rotary spark gap. On this page I found what I need. http://www.tb3.com/tesla/sparkgaps/1800srsg/1800srsg.html
But the motor model is not 100% same on the web page the motor is a (SHINANO TOKKI X7807-202V) and I have (SHINANO TOKKI X7807-015V... |
H: What limits the number of buses, devices and functions on a PCI bus?
I am learning the PCI/PCIe bus. I learned that:
A PCI hierarchy can support at most 256 buses.
A PCI bus can support at most 32 devices.
A PCI device can have at most 8 functions.
I checked the Configuration Header Type 0.
There's a Device ID f... |
H: Can two normal batteries be connected by series and parallel, at fraction of second apart, so as to charge and discharge at the same time?
Two ordinary wet cell batteries can either be connected by series or by parallel.
What happens if I have a contraption that enables these connections to alternate between serie... |
H: How to fix a PCB inside this enclosure?
This is a related question to How to fix this in an enclosure without glueing.
However, for a protoboard/PCB, how could I attach it to the enclosure? The bottom of the enclosure has holes for attaching, but it doesn't have screw thread. How should these holes be used and how ... |
H: MCU with single external clock pin
I am selecting an MCU (EFM8BB10F2G-A-QFN20 Datasheet here) for one of my projects and I found a strange thing. This MCU has only pin for external clock source:
Till now, I have never encountered this case. In every other MCU I have used, there were two pins for connecting an exte... |
H: Does a soldering iron tip consist of multiple parts?
I recently purchased a new soldering iron and read here that it is good practise to tin the tip before actually using it. As I turned on the iron and applied solder to the tip, I noticed the very top of the tip accepts solder perfectly fine, but the lower parts h... |
H: TP4056 & resistor at VCC
Could someone please explain me what is the 0.4Ω resistor at the Vcc pin (yellow color)? Why it is surrounded by a dashed rectangle? Should I add such kind of resistor when I design my circuit?
AI: If you leave out the resistor and charge a battery with 1A (maximum current that the TP4056 c... |
H: IN/OUT pin of the crystal circuits
Got few questions about the input/output pins of a crystal circuit.
As shown above, it's a common clock circuits.
My question is:
1. If we want to measure the waveform of the clock, which pin should we probe and why?
2. In the internal circuits inside the IC, which signal (IN or ... |
H: switch 3 references voltage for my servo position
I have some positioning servo driver and servo with pot feedback.
Now I try to build circuit to switch between 3 positions. For testing I just use 3 way switch and 3 pots as voltage reference, but in my destination project my switch will by 10 meters away from servo... |
H: Voltage of Different Voltage Sources in Parallel with Diodes
I am working on a project in which I will have two different power sources, which I will have to dynamically switch between to supply power to devices. These two power sources will likely be similar in voltage, but may vary slightly.
I figured that the be... |
H: Two-port model of a BJT
In electronic books, the small signal model of a BJT is given as:
I've just studied two-port networks theory and, as an application, another book I'm reading shows this picture:
1st question: why do we have a voltage-controlled voltage generator on the left (which is absent in the first im... |
H: Using MOSFET to turn on/off auxillary electronic circuit
I have custom-build e-bike which is basically a motor, battery, controller and an LCD screen with 3 buttons. When I push ignition button, the LCD sets voltage on one of it's signal wires (blue) to 51 - 67.2V (BAT+, depending on battery capacity) which is then... |
H: Including one module in another module with variable
I need to implement this code to synthesize and do so that xor21 and and21 will work separately.
module top(
input a, b, x,
output c
);
always @(a or b or x)
begin
if(x)
xor21 x1 (.a(a), .b(b), .c(c));
else
and21 a1 (.a(a), .b(b), .c(c));
e... |
H: 1 Byte Register broken into 2 Nibble outputs not working VHDL/ModelSim
I have made a 1 byte instruction register in VHDL. Instead of having a 1 byte output, I have created an upper nibble output and a lower nibble output. The lower nibble output is special because it uses a tri state buffer. It has this because ... |
H: Do I need a heatsink for a MOSFET
I'm currently working on a project where I need to be able to switch 7m of 9W/m LED strip (connected from both sides) using an Arduino with PWM. So the power of the led strip is about 63W at 12V. I have a plenty of IRF540N mosfets lying around but I need to calculate if I need a he... |
H: TL431 Constant Sinking current
A user already asked a question about it at TL431 Constant current source. My SPECIFIC question is about the figure 29. Sure it is not a complete circuit, so I completed it, in order to understand it, with two resistors, R3 and R4, as place holder for possible "useful circuit".
And s... |
H: How to make shift register logisim
How would I make a 4-bit shift register with D flip flops so that only 1 LED is active at once. So for example if a button was pushed the first LED would light up and the other 3 would be off. If the button was pushed again the second led would light up and the other 3 would be of... |
H: Electrical circuit with capacitors and transistor
I don't know how this circuit works. So I would like someone to explain me. I know that the qustion is too general, but I am new in electricity and I don't know someone who can answer me how this works.
The result is that when The circuit is connected to 9V battery ... |
H: What is the main difference between AC and DC generator basic working principles?
I cannot understand the main difference on AC- DC generator basic working principles.
Lets consider how a loop wire works with a magnetic flux inside a DC generator briefly. Whenever the sides of the loop wire cut the magnetic flux li... |
H: How can I enable a LDO using the I2C SCL signal
Can I enable/disable an LDO (more specifically NCV8163AMX280TBG) by using the I2C SCL signal?
This would allow me to turn ON the regulator once a master starts the I2C protocol and turn it off once the master stops communicating via I2C.
If possible, what extra compon... |
H: when dividing two integer result truncated to 0
when i divide two integer and if the result is below like 0.987, then it become zero
uint8_t time = 11;
volatile uint8_t val[2] = {11,12};
return (uint8_t) (time* (val[0] / val[1])) // 11 * (11/12)
from above code the return value is 0, (i.e 11/12 = 0.916 ,but ... |
H: Simulating a variable mutual inductance model
Can we simulate a time varying mutual inductance in Matlab Simulink (or any other simulation tool).
Matlab Simulink has a variable inductor, but I could not find not mutual inductor.
AI: (or any other simulation tool)
In LTspice you have the behavioural inductor. The ... |
H: How to pick a voltage comparator switch for a low power circuit
I am finishing up an embedded project for my vehicle and the last step is to make it automatically power off with the car. The way I detect whether the vehicle is on or not is via a battery pin, which maps the car’s battery voltage as a value between 0... |
H: Building a series RLC circuit using a given resonant frequency and bandwidth value
Assuming that we have to build a simple series RLC circuit in such a way that the its resonant frequency must be 200 krad/s and its bandwidth as 20 krad/s, we have these components:
Resistor: 1000 Ohms
Inductor: 2.5 mH
Capacitor: 2... |
H: Regarding headphones
i have a headphone. it it having problem while listining to music. it is having wheel like structure to increase music. the wheel like structure is having problems. when i press it little or roll it slightly then sound is good but it again stops. Please help me.
I m sorry that the question is o... |
H: Voltage follower problem
I've modeled the above circuit, but the breadboard version does not work.
(There are no unexpected oscillations - I'm just looking at DC levels.)
I'm trying to shift a 0.4V - 2.0V DC signal to 0V - 10V DC signal.
There is ref. 0.4V at pin 5 (+) of U6, the voltage follower, and 0.4V as you ... |
H: Frequently interrupting the CC charging stage of a Lithium-Polymer battery
Because of design constraints I need to charge a 2S Li-Po battery over its balance connectors using a single-cell charger IC (e.g LTC4002). In order to allow the user to interrupt the charging process before the battery is fully charged, it ... |
H: Impedence Matching of Antenna and Coaxial Cable
There is a scenario based question which is confusing for me
Antenna had four rods each 15cm arranged as a plus sign. its brass shielding was cut and it had two 75 ohm coaxial cables in it. one 10 cm long was connected to rod A and C whereas other was 17.5cm long conn... |
H: Why not all the diodes are in "on state" in the given picture?
Given:"all the diodes are ideal",in figure (e), only D3 is on and rest of the two diodes are given off in the solution. Similarly for (f) only D1 is on. I don't understand the logic behind this. Please help in understanding this thing.
Update: Showing ... |
H: Should analogue multivibrator and comparator pullup circuit have separate supplies?
I have managed to produce a design within the falstad circuit simulator for an analogue "LED chaser" using an analogue multivibrator and 3 comparators inspecting the voltage of one side of the multivibrator.
Once I had completed it ... |
H: mips single-cycle branch verilog
I'm fairly new to Verilog, hardware design and computer architecture. Nevertheless, I've had a go at designing a simplified MIPS processor. It seems to mostly work fine but whenever I simulate it, it hangs on a BEQ instruction.
I'm trying to get it to run the following program (R1 i... |
H: why MOSFET Driver
Why do we youse MOSFET Driver when we use MOSFET as a switch in a high side configuration and we do not use it in low side configuration?
Can we drive a MOSFET ON/OFF with the OUTPUT of UC3842?
AI: Firstly the UC3842. It has a push-pull BJT driver and is quite suitable for driving the high capaci... |
H: TRIAC won't turn on/turn off
I'm trying to make simple lamp switching circuit to work, but it just doesn't want to work as intended - question is, why?
I'm using MOC3021 random phase optotriac with BT136/600E sensitive gate triac in such configuration:
simulate this circuit – Schematic created using CircuitLab
Fir... |
H: Not enough pins, looking for a "demultiplexer" that keeps state
I want to control a simple display with a microcontroller. The display has 8 input pins, the microcontroller only 6.
Is there an IC that I can interpose that
lets me set the state of each of its output pins and keeps it that way
requires the least amo... |
H: Not getting expected voltage at LED
I recently picked up and arduino nano kit and messed around with all the simple projects. I dont have much EE experience besides those so I have a question that might be pretty basic.
I am trying to make a simple travel lantern with a rechargeable Li-ion battery pack. It is worki... |
H: Conflict of polarity?
With the following circuit, would the R2 resistor not change or affect the polarity in some negative way (no pun intended)?
In the image below I added the red box as well as the red text in an effort to try and understand what is happening when the R2 resistor attaches to the +4V lead.
Can som... |
H: Dealing with coupling of PWM noise into Hall-Sensors as spikes in BLDC driver circuit
I have designed the first revision of a BLDC driver board (based on STM32 and DRV8323 chips). Right out of the bath (after writing the firmware of course) I noticed that the coupling of PWM into the hall signals is very terrible!
... |
H: Does the phone transmit waves?
In a cellular connection, How much is power density (in W/m2 or mW/cm2) of the RF energy from the phone to the tower? If not possible in above units then can I know in dbm ? My phone has:
Head SAR: 0.75 W/kg at 10g tissue
Body SAR : unknown
Connection : LTE
Is it true that the power ... |
H: Create Circuit Simulation
I wonder if someone can help me. How will one go about to create a simple circuit simulator? Similar to Multisim, just a lot simpler!
Basically, I only need resistors, capacitors, inductors and voltage sources.
Is there a tutorial I can follow, to create this using C# and Visual Studio?
A... |
H: Can a rocket igniter rated for 12v and 3 amps be powered with a 4v battery at 9 amps?
I have a rocket motor igniter that says it requires a 12 volt battery at 3 amps. Since power is I x V, and power is really what heats up the wire that starts the igniter, is it possible that I could use a lower voltage battery, bu... |
H: Speaker input connector
I want to buy connectors which are generally at the input of speakers or amps. I have attached a picture below.
What are these plugs called? I cannot find these on Digikey.
Thank you for your help?
AI: Try this link:
http://www.electricalcableconnectors.com/sale-7620516-terminal-connector-s... |
H: Converting DC to AC power supply
I have a simple wiring question.
I want to convert a LED light that uses 2 AA batteries, to AC power supply. I have 3 of these lights. I'm assuming each light uses 3V for a total of 9V. I have a 9V AC to DC 2A power adapter.
How should I wire this? Would such a connection work? I'm ... |
H: Bridge rectifier filter capacitor remove
My question is very simple. What components should be removed from the following circuit diagram for this circuit to work only on DC voltage? I'm sure that the bridge rectifier should be removed further than that I do not know.
AI: You can remove everything connected to pin ... |
H: Is it good practice to run large amounts of current through a MOSFET?
I have been looking for a good way to control the flow of a lot of current in my project. This may at some points be 40-50 amperes at 12-15 V. While relays are a good choice, they are mechanical and therefore take time to activate and wear out ov... |
H: How to make a circuit for DMX splitter notification LEDs?
I am trying to make a DMX splitter. Everything works now, but it would be somewhat useful to have notification LEDs, like in the example below.
For the input I could use one LED, which I either connect to the RS485 + or -. Which one does not matter, because... |
H: Dynamo - Reversing the rotation of the shaft
I'm having a debate with a friend. He claims that if you change the rotation of the shaft of a dynamo the output DC current changes direction. I, however, claim otherwise. The way I see it is that a dynamo rotates a coil inside a magnetic field, this produces an AC sine ... |
H: -Ve feedback comparator and its threshold values?
I was trying to analyse and understand the following circuit.
My intention was to calculate the hysteresis of the comparator.
Circuit working: For both compartor input, there will be voltage inputs ranging from 40 mV to 250 mV. This will vary as per the connected c... |
H: Capacitor actual value with DC bias
I did find this answer which explained why the capacitor is affected by the DC bias, however, my question is more on the application.
Let's say I have a capacitor for which I have the DC bias characteristic (Cap Charge [%] in function of DC Bias [VDC]) such as follow:
Now, let's... |
H: Are there any reason why i shoudln't run an atmega328p at 16mhz on 4.2v?
I am wondering what problems might occur if i reduced the voltage from the usual 5v down to 4.2v.
AI: The "P" in ATmega328P stays for "picoPower", which was Atmel's name for devices working down to 1.8V and possessing multiple power-saving fea... |
H: Hovercraft not moving at all
I'm a beginner in electronics. I tried making a hovercraft that looks like this:
The bottom looks like this:
And the battery used is this:
I have used a 9v motor, a 9v battery and a dual blade propeller. For now, I just temporarily connect the wires to the motor to see how it works. A... |
H: DMX receiver 40V signal
I am creating a DMX receiver circuit. The dmx that is received from a controller (USB DMX dongle) is converted via a transceiver (SN75176BP) to a signal which can be understood by an ATMEGA328P.
I now have the problem that it is not recognized. When I measure on my circuit at RX I get the s... |
H: Charge capacitor with static electricity
Can i charge a capacitor fully with only static electricity?
I already took a look at: Electrostatically charging a capacitor and How to charge a capacitor with static electricity? but i'm not sure this answers my question fully.
Can you explain to me if it is possible to ch... |
H: Did I ruin my multimeter with a current measurement?
I am trying to do a current measurement.
Probably I accidentally put it it parallel instead of in series.
What I tried before/after that (cannot remember exactly putting it parallel but might have happened likely) :
Used both connection with 10A and normal outp... |
H: Confused with figuring out this piezoelectric sensor
I have this impulse-hammer with this specific model data-sheet.
It has output through BNC and if I hook it up to a scope or a daq board, I see nothing but some 50Hz noise when the hammer is hit. There is no direct output.
But when I use this hammer with this ampl... |
H: Motor driver chips only work one time?
I have the following chip (DRV8833)
Technical documentation
The inputs work the following way
And i have connected it the following way (I think)
simulate this circuit – Schematic created using CircuitLab
It worked the first time i turn everything on and toggled the GPIO p... |
H: Logisim ROM Output not matching address input
I'm getting this really weird problem when trying to use the built in ROM chip in Logisim. First off, even though I specified a 16-bit data bit width, the ROM only stores 4 bits per address (isn't this supposed to be 16 per address?).
When I specify an address (input), ... |
H: Change laptop 5.5mm barrel connector
I'm looking to replace the female 5.5mm barrel jack connector on my
laptop with a female USB C connector. The replacement USB C port need
only provide power and nothing further. I'm not sure how to go about
this. I've never modified anything electronic before, soldering is new
t... |
H: Why does this dimmer switch have reduced wattage capability for LED / CFL bulbs?
The Lutron "Maestro C•L" dimmer has different wattage ratings depending on the type(s) of bulbs being controlled. Its an electronic dimmer.
Specifically, when 100% incandescent or halogen it can handle 600 W, but when 100% LED or CFL o... |
H: ac voltage added to dc base line
I began to read up on transistors, which led me to this post on electronics stackexchange.
At the end of the original post, the question asks "the voltage at the base would be a sine wave with the DC bias as the baseline, correct?"
I understand the V2 with the two resistors in ser... |
H: ARM Cortex cores with peripherals, basic requirements
I've been reading a lot of stuff about using ARM tool chain to build applications for different microcontrollers including ARM cores. Right now, I've been using the fairly easy route with Atmel Studio 7 for xmega devices.
I understand that header files are prov... |
H: MOSFET vs. relay power efficiency
Newbie question here. I am putting together a remote switching box for power circuits aboard a yacht. The design is for a central Raspberry pi to send orders to a few boxes, each controlling a number of circuits distributed through the vessel. Each box will contain an Arduino commu... |
H: Voltage drop on diode
(0.5V ---- 100R resistor --- diode --- gnd)
How do you figure out voltage drop on this diode? (Lets assume forward voltage of this diode is 0.7V)
AI: To answer your question, what is the diode voltage drop with Vin=0.5V with 100Ω in series?
My answer
430mV with 70mV drop on the resistor fr... |
H: Confusion with signal/source being low or high impedance
Regarding the following excerpt:
High impedance source gives you more volts and less current
Low impedance source gives you lower voltage but more current
What is meant by low impedance source and high impedance source here?
By "impedance" is it meant the o... |
H: STM32 Anti-tamper pin deactivation
I am working on a project that uses the STM32 Cortex M3 LQFP48.
There is a pin for Anti-tamper (PC13).
I am not concerned with anti-tamper security as this is just a home project.
How can I deactivate this feature on my chip?
AI: This is covered in the description of the backup co... |
H: What is the purpose of the Load transistor in a TTL Logic NOT gate?
My professor presented the NOT gate in the Transistor-Transistor logic as the following:
Where V is always 5Volts. The two symbols are MOSFETs N-type transistors. The first transistor (which is always conducting) is called the Load transistor, and... |
H: is a voltage regulator required for atmega328p when powering from boost converter at a set voltage?
I know that linear voltage regulators are more accurate at holding the required voltage but the boost converter i am using seems to keep a pretty steady one. the voltage will of course be within the chips requirement... |
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