# All Questions

116,704 questions
25 views

### Is it possible to control DC-DC boost convertor by N-ch MOSFET @ Vin-?

With the widely available DC-DC boost ready built modules based on MT3608 chip can I control it by adding the N-ch MOSFET to the Vin- line like this: The module itself are pretty reference in design ...
51 views

### I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
68 views

### Is it possible to use zero crossing detector for AC?

UPDATED: Dear connection Is it possible use zero crossing detector circuit for detecting AC voltage variation ? figure above (i got from google) , is work for my situation? any circuit you could ...
17 views

### Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
27 views

### RTC input to Arduino Mega in the form of G code [on hold]

I am working on a headless CNC machine. I am using two arduinos for it. The Arduino UNO has a CNC shield and GRBL interpreter code. The Arduino Mega has to be interfaced with an RTC, a keypad, an LCD ...
6 views

### Hspice : find max of measurement result in Hspice

i need to calculate efficiency of a circuit for diffrent parameters and then, find MAX of these efficiencies in Hspice.( also related parameters that refers to it) i ran i .DATA transient simulation,...
51 views

### opamp constant-gm bias circuit

I try to incorporate the constant-gm bias circuit (Figure 6 in Improvements_in_biasing_and_compensation_of_CMOS_opamp) into the PFC (positive feedback frequency compensation) opamp, but it resulted in ...
49 views

### Which type of oscillator should I use?

I want to make induction heater. So I want to make oscillator for this. I want to make oscillator with transistor, inductor, resistor, diode and capacitors but not IC, relay switch, op amps etc. Which ...
26 views

### How can i use ACS712 to detect AC voltage variation?

I have a current sensor IC(ACS712) and try to create a capacitor combination as shown . is it possible to detect the ac voltage variation using this ic? i am tested ones but i got result a constant dc ...
25 views

### Why would sdi to hdmi work, but not when I convert sdi to hdmi to dvi [on hold]

I am transmitting video over sdi and converting from sdi to hdmi with an aja Hi5. This works, but if I convert that hdmi output into dvi, the output is either not detected, or constantly connects and ...
54 views

### How does placing cap between signal GND and earth GND solve common mode noise?

Thanks in advance for your time. I am reading several articles about differential mode noise and common mode noise. Among which I found the below 2 pretty instructive: https://www.murata.com/~/media/...
53 views

### Seeking simple circuit for converting 5vdc to ~15vac

I picked up some sample smart materials because I have a small project that I want to put 'magic glass' on the outside of so to speak. I picked up a couple of different sample pieces from a couple ...
35 views

### How do I calculate expected output voltage of car audio amplifier with given conditions?

I have a 4-Channel Amplifier rated at 800 Watt RMS per channel @ 2 Ohm load. Channel 3 and 4 are preset to operate a subwoofer speaker while Ch 1 and 2 are set to operate mid-range speakers at ...
47 views

### Why are the inputs of an ideal op-amp “inverting input” and “non-inverting input”?

Here is the first ideal op-amp circuit, called an "Inverting Amplifier", that many students will encounter: The gain here is $G=-\frac{R_F}{R_{IN} }$. Thus, with a negative gain, $V_{OUT}$ is ...
40 views

### 8 bit LED cycle no microcontroller

This is my first post, so I apologize for breaking any norms. I am trying to build a circuit for my college electronics class, and I would like to drive an 8x8 LED matrix. I have experience doing this ...
29 views

### Instrumentation Amplifier Saturation to Rails

I am working with a TI INA821 Instrumentation Amplifier to try to amplifier a 0-5mV (delta) analog signal off a strain gauge. To reiterate, every DC analog value between the delta of 5mV represents a ...
52 views

### How does a computer know when to “get” the output from the ALU?

Basically what the title says, I guess I've got some sort of misconception or somthing probably. The ALU can have, say, a ripple carry adder which doesn't produce its entire output all at the same ...
49 views

### What is this connector and where can I get one?

I'm trying to create a replacement cable for a Motorola Atrix lapdock. I know what the pinout of the connector is, so I just need to figure out what specific part to use. The metal housing of the ...
34 views

### voltage drop calculations single phase ac

In voltage drop calculations, in one of the methods in case of single phase ac, the formula is given as follows As you can see, R is resistance per unit length multiplied by length by current and ...
57 views

### Speed limiter - 24v Motors

I'm looking for a way to limit the speed of some wheelchair motors in order to gain better control when using them in my RC device. Currently the motors are very sharp and don't ramp up to speed, ...
23 views

### protection board for 18650, voltage drop? normal?

I made a power pack using 18650 batteries from an old laptop. All batteries tested individually are good. 4 batteries in 2S format. I used a cheap 2S 3Amp rated protection board I got on Ebay from ...
74 views

### Band pass filter implementation using 741 op amp

My assignment for a school project on Circuit Theory, is to construct a Band Pass Filter at least 3rd order with a stop band around 20kHz. First things first, I need to design the circuit. I have to ...
26 views

### How to Choose Proper Components for Class D Amplifier Circuit

Hi I am designing a class B amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board (see below). I have tried building out this ...
53 views

### Is there a difference between a tempco resistor and a thermistor?

That is, other than just the nomenclature.
94 views

### UART receiver in VHDL for nexys 4 ddr board

I'm trying to program my nexys 4 ddr board to receive 1 or 0 as ASCII charachters via UART and display it on one of its 7segment display ,the LED that shows when its getting data is flashing but it ...
9 views

### calculating the probability of a successful broadcast in p-csma protocol

am quite unsure with the following question. would appreciate your help with it: in a 3 stationed p-csma network, where $p=0.3$, we know that in $t_0$ the network is restarted, the channel is ...
31 views

### SCR reverse current during switch off

In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off. I'm interested in calculating the maximum reverse current (iR in the plot). The parameters that ...
55 views

### LTSpice: Produce Bode Plot for Compensated & Uncompensated Boost Converter

I am designing a product which uses the LTC3122 as a 5V-12V boost converter (datasheet here). This particular device provides the ability to add gain compensation, phase lead, or both. In my case I am ...
19 views

### calculation of torque constant based on bldc datasheet, getting different torque constants

I'm trying to get the torque constant of a bldc. Based on this: how to read datasheet I just divide the torque at any given point with the current. I tried out that method with different values and ...
44 views

### Some LTspice questions. Decoupling capacitor doesn't effectively block DC. Pull up resistor voltage doesn't drop to logic low level

I'm trying to design an interfacing board that is used between a micro-controller and a phone simulator (a picture of the schematics is attached). The 44VDC is used for the phone simulator to detect ...
49 views

### One time blink then turn off circuit

is it possible to change Circuit Diagram for the following example: http://www.redcircuits.com/Page146.htm or https://www.youtube.com/watch?v=mrxdiO1b29A Original: 4 short flashes stay on light ...
63 views

### Handling Large Variable Data with a Microcontroller

What is good practice for storing and manipulating variable data in a microcontroller circuit when the data may exceed microcontroller working memory? In my application, I am designing an access ...
68 views

### A question on the meaning and model of microphone impedance

I’m a little perplexed by the circuit model and meaning of a high or low impedance microphone. Here is an example where someone at this page is trying to investigate the effects of low or high mic ...
29 views

### What type of transistor or FET should I use for switching circuit? [on hold]

I have a lot of noise in my circuit due to my bridge rectifier being coupled to neutral to provide a common path to ground between devices. My signal to noise ratio is very poor. about 0.6V noise ...
50 views

Below is my code for ALU which instantiates a 4:1 MUX and a 32 bit squarer modules. The port connections can be seen in module instantiations. However it is important to mention here that input of MUX'...
38 views

### MCP19035 buck converter controller

I'd like to design a buck converter using MCP19035, I've gone through the datasheet of this component and and the design procedure using it. In the datasheet, it says that the component provides Two ...
96 views

### Does 20 Millegausse near outlet with nothing plugged in suggest faulty wiring?

Meterk EMF meter showing 20+ millegausse near two outlets only. Both outlets have nothing plugged in. Possible live and neutral wires faulty?
24 views

### Durable, UV-resistant labeling for electronics enclosure

I'm not sure if this is the right forum for this question. I'm asking here in hopes that someone has dealt with this. If this is the wrong forum, please do not vote me down. If necessary, I'll simply ...
28 views

### How to attach a button to the circuit board on a key fob?

I have a power lock key fob for my Subaru where the unlock button has detached from the circuit board. I would like to try to re-attach it, but I am not sure about the right method. Is there some sort ...
34 views

### Variable water flow control with a microcontroller [on hold]

As the title states, I'm looking for a simple way to control a water flow with an Arduino or Raspberry Pi. I need: Flow rate: 0 to 50 ml/s, adjustable to any value in that range (i.e. I need to be ...
25 views

### STM32F429 CANopen with or without transceiver

this might be a stupid question but i'm unable to clarify this by myself. So i'm working on a project with a STM32F429zit microcontroller. I would like to use CANopen in my project so i can ...
43 views

### Battery systems for 440v industrial motors

Are there systems utilizing batteries to start large (25hp - 50hp) 440v 3-phase electric motors, thereby eliminating spikes to the supply grid?
2k views

### Can a USB port passively 'listen only'?

I have a small dedicated controller built around an Arduino that accepts commands from a PC over USB (serial). The communication is one-way -- the controller never sends data back to the PC. Now I ...
35 views

### Calculating current and voltage from RL circuit through differential equation

Our circuit, where R1 = 3 Ohms, R2 = 1 Ohm, R3 = 2 Ohms, L = 5 milliHenry, and I = 0.01 Ampere. Trying to figure out the differential equation for this circuit, as well as the current for the ...
46 views

### Is difference amplifier a differential amplifier with a voltage gain of one?

I see these two terms are used in same context. But what is the difference in meaning? Is difference amplifier a subset of differential ampfier with unity gain? I couldnt find a duplicate question.
33 views

### Altium: Parameter from 'Sheet Symbol' in Schematic also displayed on PCB?

As image below, I have a 'Sheet Symbol' that I will use many times. I have defined a parameter for the 'Sheet Symbol' called 'name'. Is there a way of having this text shown on the overlay/silkscreen ...
54 views

### Devices with temporary push-on,push-off switches?

I have a couple of china-cheapie devices that seem to use some circuit with a single button where first push turns it on, second turns it off -- e.g. the button works as a toggle. I would prefer to ...
62 views

### Reduce 12.8 volts DC to 3.0 DC [on hold]

I would like to reduce the voltage of a SLA battery from 12.8 VDC to 3.0 VDC. How would I do that?
58 views

### Make Input and Output circuit really I/O

I currently have a self designed I/O board. I'm using the LPC1768FBD100 Microcontroller NXP 3V3 and created 20 inputs and 14 outputs. My design allows only inputs to be inputs and outputs to be ...
20 views

### Altium: Stitching vias applying for multiple nets in multiple channels

I'm tryint to add stitching vias to my multichannel project. I have 5 nets for via stitching to be applied on each channel and 3 channels in the project. So 15 nets in total. Looks not too much to ...

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