# All Questions

3 views

### Superimpose a data transmission on a custom AC voltage line

I hope this question is valid for this forum. I’m not looking for you to give me a working solution, my question is of the nature where I can find literature, other learning resources, which search ...
8 views

### How to minimize the product of sum?

I have been cleared from canonical sum of products to minimal sum of products. May i know how to reduce the product of sum, The example is here, ...
8 views

### Touchable plastic surface

I recently bought a nice RGB Led Controller with a very nice design and i want to know what technology is used for recognising the touches on this thick plastic layer. It works absolutely reliable and ...
15 views

### Parallel mixed with series circuit

It has been a while since i tried something like that. I have R1 - R10 and need an algorithm to get always to Rges = 30 ohm. I thought about to use parallel connection mixed with a series circuit ...
10 views

### 3-phase power system problem - Will part (c) and part (b) of this question have the same answer? If not, why so?

3-phase power system problem - Will part (c) and part (b) of this question have the same answer? If not, why so?
16 views

### Discrete class D amplifier outputs low volume

I have a discrete class D project that I need help with but since I'm not an analog guy I got a problem. So far I got everything set up and the discrete class D works perfectly. But it outputs a low ...
23 views

### Calculate the voltage and the current of a ideal diode

I need to calculate the circuit below. (The used diode in the schematics is not the same from the task we have to solve. In our task we work with a ideal diode.) simulate this circuit – ...
8 views

### Earle Latch Properties

I just read a textbook describing the Earle latch but no truth table was given for this device , does anyone know this truth table. Also the book states that by varying the complementary clocking ...
15 views

### Jetpack for People

I want to make a Jetpack which will be able to carry people from one place to another place.I want to do it with Electronics.Any Suggestions?
19 views

### Phase Margin Criterion

Why is 45 degrees considered minimum phase margin. Is it just for stability considerations or some other reasons too? Thanks.
20 views

I'm designing a radar receiver, whose block diagram is below: When I compute power received from radar range equation, it varies between -90 dBm to -40 dBm depending on the object's location (60 to ...
12 views

### Setting up piezo pump with arduino

I'm trying to control a 12V piezo pump (with an inbuilt driver) and I'm a bit unsure how to use it safely. I'm using an Arduino Uno to control it, with an N-channel MOSFET rated at 60V 30A (with a 10K ...
24 views

### Glass break algo by ti

hi working on glass break ti algo. first, i am using the same code as provided by ti in order to detect the glass break.so all the filtering mechanism are right and i am using the kit being provided ...
15 views

### Why sinusoidally varying torque in induction machine not visible

We know that torque in an induction machine varies as $k\times[\cos(2wt)+\cos(\beta)]$ but we don't feel it. Why it's so?
40 views

### What is this cable-joining black shell component called?

What is the name of the oblong black shell thing that is (presumably) connecting the two halves of the cable? There is a small one and a large one shown in the image below. I've searched around for ...
23 views

### Is this calculation for an optocoupler's resistor correct?

I'm trying to calculate what resistor to use for this optocoupler. Per the datasheet, it drops 1.3v at 50mA does this mean I should try choose a resistor that gives me 50mA? My supply is 3.3V so my ...
22 views

### 3-phase Brushless Motor - Are Volts and Amps at (X)RPM equal/similar when used as Generator?

If I have a Brushless 3-phase motor that spins at 3000rpm when given 6.0A @ 20v (no load) will it produce 6.0A and 20v (or anywhere close) when used as a generator and spun at 3000rpm?? And i suppose ...
12 views

### compare design discrete fet and pwm with FET integrated into PWM IC

Some new design of SMPS use the power FET integrated into PWM IC. Compared with discrete FET and PWM IC solution, what are the strong points and the weak points of the new design ? As your opinion, ...
15 views

### 16-to-4 Encoder using gates and CMOS [on hold]

I am facing a problem in implementation of 16-to-4 encoder. Can anyone tell me circuit diagram of 16-to-4 encoder using Gates and also with CMOS?
41 views

### Resistor/Ohm's law question?

I just used Ohm's law and I was puzzled by this. I am quite new to resistors, and I am only going to use it for an Ionocraft project to reduce the flow of current to ground. So if I have a 9v ...
27 views

### How are PCB's programmed? [migrated]

So recently I have been looking into prototyping my arduino project and there are a lot of tutorials online on how to take your Arduino and using a software such as Eagle to make a PCB layout but I ...
35 views

### Need help picking components for a stir plate [on hold]

I was going to make a stir plate to grow yeast for brewing beer. It involves using some type of housing (cigar box, wooden box), wiring some DC voltage to a switch, to a dimmer controller, to a PC ...
82 views

### What's correct way to toggle a single bit and a whole register in microchip C programming?

I'm trying to write a code where when a push button is pressed, a whole PORT is toggled. So I got a push button at PORT E in pin 0, and 8 leds on PORTD, I also got a debugging led on PORT E pin 1. ...
30 views

### Circuit Implementation of Dynamical Systems - Lorenz Equations (Failure Analysis)

Let me begin with the disclaimer: I am a mathematician and not an electrical engineer. That being said, surely I am missing something simple. For classroom demonstrations in dynamical systems, I have ...
28 views

### Can you explain this differential amplifier exercise to me?

So we have the exercise in the figure The figure is The solution according to the book is VE=-0.7 Volt thus I=(-0.7+5)/4.3=1 mA so re= 50 ohm.Why is re=50 Ohm here? a) Ad=V0/Vd=α*2/2re .Why ...
45 views

### What is a full rectangular output characteristic for a power supply?

From what I understand, a rectangular output characteristic of a power supply refers to the fact that the maximum power is achieved when Vmax and Imax occur simultaneously. Kepco has a power supply ...
24 views

### Inverter noise picked up on USB data lines breaks USB communication - signal integrity

I have an equipment where the CPU is a 16-bit dsPIC. There is an inverter board switching 300V across a 4 MOSFETS H-bridge at 20kHz and delivering 180W. This equipment communicates with a computer ...
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### Continuous charging and varying load on 48v AGM - Will an ESC work with a battery that is being charged?

So, in a lightweight IC/electric hybrid motorcycle I am using a small 4-stroke engine to turn a Brushless RC motor (the generator). Then a 3-phase rectifier bridge to supply 59.2v DC @ 12amps to a 48v ...
26 views

### Thermopile Detector Datasheet question

I'm working on making a detector using a Thermopile. Here's a link to the page and datasheet. Link I've looked through and am not sure what the values for Ra, Rb, Rc, and Rd are supposed to be. If ...
18 views

### what type of liquid flow control could this device use - skyflo - solenoid Venturi [migrated]

I am trying to figure out what kind of device is being used to stop and start the flow of liquid inside this device. Below is a link to the device. It looks too small to be a solenoid or pump? how ...
17 views

### What is the relative mass of a LiPo cathode?

Relative to the mass of a LiPo battery cell, how much is the mass of the cathode? That is, what is the percentage-mass of a LiPo battery's cathode?
38 views

### Electrelet Microphone in Amplifier Circuit

I am trying to build this circuit with the only difference in my version being 9 volts instead of 12. For my Microphone I used a Electret condenser microphone from here. It says it runs on 2.2vdc so ...
23 views

### Harddisk recovery of what seems to be dead drives [on hold]

I have two harddrives of 1TB each, which won't spin up and doesn't give a sound either. I have had two repair shops give an estimate. One in Denmark would send them to Norway for repair = super ...
43 views

### Why Some SMPS use Tiny Switch, Some use Top Switch and Some use Link Switch and Other use PWM IC. Please guide what is the criteria to select?

I saw many smps design , Some use Tiny Switch , Top Switch , Link Switch and other user PWM Control IC only. What is the difference and how to choose right one??
46 views

### Can I decrease volts to increase amps

I made a solar USB charger that uses an LM2596S variable voltage regulator to decrease the ≈22V to 5V. It works fine for my older devices but lacks to current to activate the charge mode on my ...
94 views

### Single-supply DC amplifier circuit with “gain” of 0.66?

I have a DC voltage source $V_{in}$ which slowly varies in the range 2.5…4.8V. I need to linearly scale it down by ⅔, to feed into a 3.3V ADC pin. For a voltage divider, the source has too high ...
59 views

### Passive voltage drop from 6V DC to 5V DC for 3W circuit

I plan to put an Arduino onboard of my hub-generator powered bicycle circuitry. Currently, I have a circuit consisting of: 6V/3W AC hub generator (variable frequency and power); Rectifier bridge; ...
45 views

### How to boost (double voltage) a sawtooth generator

I have a circuit to drive, using a sawtooth generator, four varactor diodes (FC54). These varactor diodes has the following specs: from 2.5pF (at 15V) to 30pF (at 0V), but my sawtooth generator, based ...
54 views

### Reset IC Buffer manually

I have a buffer which I want to reset. The EN pin is connected to a pull upp resistor while the Reset pin is connected to pull down resistor. What should I do to reset the buffer manually? Should i ...
26 views

### Sawtooth generator for varactor diodes (looking for schematic) [duplicate]

I have to drive a pair of varactor diodes (FC54) using a sawtooth waveform. Considering that these FC54 varactor diodes change the pF value from 2.5pF (at 15V) to 30 pF (at 0V), i need a sawtooth ...
50 views

### LED fuel indicator instead of halogen

I have this problem which is driving me crazy: I want a LED light to indicate when my motorbike is running on emergency fueltank. The system works with a normal halogen bulb, and the system is ...
37 views

### 5v dc drops to 2v when applied to L293d [duplicate]

I have a 5v dc supply generated from voltage divider and this 5v is used to drive L293d. But the problem is as soon as 5v supply is given to L293d the voltage drops to less than 2v. what could be ...
15 views

### Where to fine a DG1U 17VDC TV-5 DEC Relay it is driving me nuts [on hold]

I have a plasma TV that is turning off after 2 seconds. I replaced all the Caps on the board but it still does it, power seems to stop at a Relay that is marked DG1U 17VDC TV-5 DEC A121china it looks ...
16 views

### Enable connected to unpowered regulator on another board

I have an ARM board which uses a VIO of 1.8V and requires that no i/o line be driven before it is fully powered up. It signals this readiness by asserting its "SYSEN" line. My design has SYSEN from ...
5 views

### 3D device simulation of diode (static)

I am looking for a simple 3d software solving the drift and diffusion model for a diode in equilibrium. (Very simple abrupt p/n-junction - even without contacts. Purpose: teaching). I know Silvaco ...
39 views

### What is the transfer function for this op amp circuit?

I'm trying to determine the transfer function for this op amp circuit. The 2 input resistors have the same value, its the same with the loop-back resistors. I tried solving the function for ...
30 views

### How to estimate motor current under load

How do you estimate the average current under a typical load of a brushed DC motor? I'm trying to size the right motor, motor driver and battery to propel a small two-wheeled platform using this ...
44 views

### Fail Safe for circuit, when input is removed

I have built a circuit which inverts the signal of a ULN2003A, it is in turn connected to a relay. It is possible for the ULN2003A output to be disconnected from the external circuit as it is remote ...