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# Electromagnetic Circuit

1000 Threads found on edaboard.com: Electromagnetic Circuit

## Power Oring Using Mosfet

Here's the circuit, as shown in fig1, There's Supply from adapter(9.5V DC), there's also a supply from the battery(8.4V Max). Diodes used(D1,D2) are shottky diodes, with a typical drop of (0.3V-0.5V). The problem i was facing was even though battery voltage at given point of time is less than Adapter Voltage(ADPT), At TP3, I was still getting batte

I have been digging through various forums and internet articles searching for a current sensing relay circuit that will activate a low voltage relay when the circuit senses a 120v machine drawing 5 or more amps of power. I have hand drawn a schematic and is attached. My desire is to activate a low voltage circuit by simply "closing" the

## AC-DC power supply design

I'm trying to design a self contained DC bus power supply. Specifically it's for a 400v 2200w AC servo drive. Trying to get this all down on 1 PCB for simplicity. I've been using this drive for some time with just 240v mains rectified to 340vDC and some filter caps. The inrush current on charging the caps from flat is rather large, Which for a whil

## CMFB biasing current in fully differential Opamp with adaptive current source

Hello, I am trying to apply an adaptive biasing technique to source the differential pair of the fully differential amplifier, the adaptive biasing source a current of let say Ib under small signal condition. Under slewing or large signal behavoiral this current is increased proportionally to the input difference amplitude. My question, I alr

## Designing an amplifier with particular values

Hi everyone, As part of the course i took in analog circuit i required to design an amplifier with these values: Rin= 52kohm Rout = 53 ohm A=35 gain in db F-3dblow = 400hz F-3dbhigh = 400khz M1= 40db/dec M2 = -20 db/dec Dc supply voltage are : +5 v , -5v Transitors are ntype BJT My idea was using a simple CE amplifier with 2 resis

## three phase volt measurement using resistor network method

hi all right now am designing three phase protection circuit for that i planned to measure the voltage using resistor net work method, herewith i had attached my circuit and my volt measuring code, everything working good but in sometimes the R phase connected to AN0 pin shows high reading, kindly go through my code and give your valuable sugges

## Motor pump starter connection with two relay to operate manual and auto

Hi, The ckt as as draw as attached, is a auto/manual control panel board for pump-motor and trying to configure to run with MCU control auto operation and manual (with start/stop button in board). With the panel here i have included 2 nos relay: Relay-1, NO, parallel connected to START BUTTON and Relay-2, NC, series connected with STOP BUTTON for

## ADC Value gets changed when a Digital output enables

Hi, I have designed a temp controller. The temp from the sensor is measured and amplified. I have an relay in my circuit. The relay is connected with the Analog port, but in different pin. Whenever the relay gets turned on the ADC value gets increased. The voltage reference is same at all instance. The chip i have used : Atmega3208.

## very simple and short inverter circuit

hai i have watched a video that display a circuit 1.5 to 220v ac inverter is it true plz must ans me if its

## Equivalent feed back model transformation

Hello i am using the two stages amplifier shown bellow into the transimpedance feedback system shown bellow. if the system shown bellow i have miiler capacitor and feedback ressistor how do i break them into the system shown in the end? Thanks. 157371 157372

## Non-symmetric S-parameter in HFSS

Hi, I am trying to design a structure where I need to add some non-symmetric s parameters. However, HFSS is automatically converting it into symmetric. What should I do in this case. In the structure, I have created circuit port and add snp file which is not symmetric. but HFSS is automatically converting this into symmetric. In this case wha

## HFSS Cosimulation using floquet port

Hello, Is it possible to do circuit HFSS cosimulation when I am planning to use floquet port for unit cell of metamaterial structure part simulation. Thanks

## NIMH Button cell 8.4volt 40mA

I need help with NIMH Button cell battery I want to Trickle charge this battery for 5 years on my smoke detector alarm stand buy current is 40 mA here is my schematic /circuit I use this is my calculation please tell me if I am right on my calculation 10.4 volt /8.4 volt =2 volt/ 1k8 resistor =1.1 mA Please advise me if you can Thanking you in

## Finding W and L of transistors from DC operating point.

Hi guys, I have a schematic of OTA amplifier: 157362 I want to know the W and L that were used to design this OTA. I don't have more information other than the ones provided in this picture. since all transistors are in saturation, I thought about using the saturation current equation to find (W/L) ratio. by assuming

## Easiest way to get 5v and ~1V

Hello. I am attempting to follow this circuit. I want to keep things small and cheap. How should I go about getting 5V DC for Vsupply and -1V DC (or less) for Vref? I was hoping to do this from a 9V DC source, but I am open to other ideas. I looked at voltage regulators but am not sure if I'd need a heat sink. If

## LoopGain analysis with multiple feedback loop

Hey guys, Please see the sketch of my circuit here. 157367 I want to do loop-gain analysis (a.k.a. loop stability analysis) for the top loop. In simulation I simply put a voltage source (i.e. VLG) in part of the feedback and run the LG analysis (ie. AC loop gain). My questi

## Need sources for Product Enclosures

Can someone suggest a source or sources for Product Enclosures... Either plastic or metal... Prototype and production quantities of 50 to 100 or more Sizes include: small circuit Arduino board inside... medium like the size of a modem or router or cb radio Larger like maybe the size of a desk top HF transceiver

## The magical audio filter other opamps?

Hi I have found this filter/amp combination, being simple with nice features. I wonder can I use other opamps like the ne5534 or is the performance specific to the 741 and will differ if using other opamps? Also how about Jfet based ones like the tl071?

## Fast static CMOS comparator circuit

Hi all, Could you recommend some key/good papers about static CMOS comparators (not dynamic ones)? Thank you very much.

## How do I connect / couple an oscillator to a bridge circuit

I am trying to use a Colpitts oscillator followed by a common collector buffer to provide the sine wave to a bridge circuit (I plan to use the bridge to roughly measure a varying capacitor - C8). The output impedance of the oscillator and buffer is fairly low (if I have calculated it properly in LTSpice). 157335 When I