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0
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1answer
50 views

Can anyone please explain how this Zener diode circuit works?

I am learning how a Zener diode works. Can anyone please explain me how to analyze this circuit (with equation if possible)? Thanks.
-1
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0answers
47 views

What is the best capacitor for oscillator circuit working at 20.000000 MHz

I am making an oscillator circuit working at 20.000000 MHz. The IC (NJU6321) needs 0.1uF capacitors. What is the best capacitor for this application? For example, mica, tantalum... or which brand?
-5
votes
1answer
41 views

Circuit analysis [on hold]

I want to know how to anlayze this circuit correctly.As well as why the upper 2 8ohms are canceld (due to short) and the 3 and 6 below aren't.
-1
votes
2answers
76 views

Right half zero in boost converters

When we increase the duty cycle in boost converters, why does the output voltage first decrease and then increase. After the time associated with the right half zero has elapsed then output voltage ...
0
votes
1answer
41 views

Connecting Solid State Relays To AC Heating Elements - Is this circuit correct?

I'm converting a 1500W toaster to a reflow oven with PID control, but I'd like to focus on the hardware aspect. I've pulled the switches and controls out of the oven and I'm left with something like ...
-1
votes
0answers
63 views

Op-amp circuit problem - input impedance and its components

I need help in solving this op-amp problem. For the circuit on picture (op-amp properties:IN impedance is infinite, OUT impedance is equal to zero) determine the input impedance and discuss the ...
0
votes
0answers
14 views

Mesh current method is my solution correct

I have to find i(t) in the figure. we have e=10 cos10t V which is converted to 10<0 , j=2cos10t converted to phasors to 2<0 R= 2 Ohm, C=0.05 F converted to -2j and L= 0.2 H converted to 2j ...
1
vote
2answers
113 views

Audio Grade Capacitors - Marketing Hype or Better Technology

I have been reading a lot about audio grade capacitors lately, and I cannot find very good information about them. I have read many posts from different sites saying that audio grade capacitors are ...
0
votes
2answers
62 views

Combining resistors in series with a voltage source in between

Am I allowed to combine the resistor R and coil Xl as if they were right next to each other? I want to make this into a current generator, without many transformations.
2
votes
2answers
292 views

How to ensure the two schematic diagrams are equivalent?

I've tried copying the schematic diagram of a typical circuit from the datasheet, but I'd like to ensure the correctness of each connection. Is there a way to somehow match one schematic diagram ...
0
votes
0answers
81 views

Mathematical relation between these two signals

What is the relation between V4 and V3 ? I don't know what to do with diodes. This is not a homework, I need to find the equation between V4 and V3 for my own project. diodes are 1n4001 and the opamp ...
-2
votes
0answers
32 views

h bridge with 4 N type mosfets [closed]

i have some kind of big problem and i need kind of a fast solution. i want to make an H-bridge with 4 N-type mosfet(what available now is rfd14n05, but i can use any kind of n type mosfets). but i ...
0
votes
2answers
40 views

Help building acceleration detection device/circuit for my bike

I want to build a device using an accelerometer. Press a button after a bike ride and have a light turn on if during the journey I managed to attain a certain acceleration. Thinking of using some ...
0
votes
0answers
17 views

Finding fermi level for germanium Semiconductor

I need to find the Fermi level of undoped and doped germanium semiconductor. The only values that i have are the ones in the pic below and that the doping concentration of acceptors is 10^17 cm^(-3): ...
0
votes
0answers
30 views

Low Voltage Switch/ Cut off for 5S lipo

Hi Could anyone please provide a schematic with component specs/values for a Low voltage switch / cut off using a mosfet. I have a power supply consisting of a 5S lithium battery pack and its ...
0
votes
3answers
70 views

Convert Electret Microphone output to digital data for transmition

I might be asking a stupid question but.... I was wondering about whether or not there is a circuit to convert the output of an electret microphone to 1s and 0s for transmission. And then we can use ...
0
votes
1answer
41 views

Chip Die Sizes Reputable Sources [on hold]

Where can I find chip die sizes for intel chip? I looked through their ARK website but details are scarce on recent processors. I know websites like AnandTech and wikipedia have die sizes listed, but ...
-2
votes
2answers
149 views

I have a hardware theory as to why computers crash?

I have an idea as to why a computer might crash for no reason at all. As you know in a computer information is represented as on or off. On simply means high voltage and off means low voltage.Now lets ...
0
votes
0answers
37 views

Momentary tactile switch ON when unit connected to AC power - circuit modification

I have an air conditioner unit that after plugging in the power cord to the power outlet is off. You need to press a momentary switch on the circuit board to power the unit on. Now I would like to ...
1
vote
4answers
108 views

A practical integrator that does not behave like a low-pass filter?

Op-amp integrators and some common integrators actually are low-pass filters in practice. So if a signal is DC, then it does not integrate but only multiplies by some amount plus some transient ...
0
votes
1answer
58 views

why discharging capacitor voltage in a rc circuit is positive? why it should not be negative?

During discharging, the direction of the current is opposite to the original current direction(source current).so the current is negative. likewise the discharging voltage direction is also opposite ...
0
votes
2answers
74 views

Summing two voltages without the use of an operational amplifier?

Is there a way of summing two voltages without the use of an operational amplifier? http://www.electronicspoint.com/threads/add-two-voltages-without-the-use-of-a-opamp.242875/ This article said to use ...
0
votes
2answers
125 views

How to plan my LED circuit, voltage, and resistor

The LED emitters in my outdoor lamps blew out and I need to replace them but I have to rebuild the emitter from scratch because replacement parts are not available. The whole lamp was made in China. ...
0
votes
0answers
20 views

Retrofitting synthesizer with internal uninteruptable power supply?

I have an old Roland synthesiser (MC-909 sampling groovebox) that I would like to retrofit with a backup battery both to avoid loosing work and just so I can take it down the park with some ...
1
vote
1answer
60 views

Question about Circuit Analysis

This is my first question of Electrical Engineering SE. I have the following circuit. I want to calculate it's transfer function, considering ideal Op amps and circuit elements. I have almost ...
2
votes
1answer
43 views

Is BJT amplifier a viable option if the design needs to be replicated without calibration?

||Sorry for messing this up the first time. This is my first post ever in a technical forum. Need to pick up the ways of the crowd. Thanks for all the feedback and help. Well appreciated|| I intend ...
-5
votes
1answer
96 views

Amplifier for Driving a 8 ohm speaker [closed]

I had extracted a 8 ohm speaker(one) from my old speaker set,Which needed a very bulky adapter for Power,I tried googling the specification and found out that orginal speaker set which was a pair of ...
1
vote
1answer
55 views

How to wire this delay relay switch

Hello I recently bought this item at ebay and I am not sure how I should wire this. I will power it with a 9 volt battery and the relay will power a pump, this is how they at ebay show how I should ...
1
vote
2answers
46 views

Is there a virtual ground in this op-amp?

Consider an ideal differential operational amplifier whose circuit looks like this, Now in this circuit diagram it is given that, the negative terminal is at 0v. But if I give a sine wave as input ...
0
votes
0answers
16 views

What kind of setup and components are in this and how does it work. Also, where can go and find the parts to buy? [duplicate]

This is a sound system I am trying to recreate. It has a 5v fm/bluetooth module on the top of it with a switch to turn on and off.It then runs to a Ceiling speaker with some sort of motherboard in it ...
1
vote
2answers
53 views

How to Generate a Calibration Signal?

I'd like to generate an integrated calibration signal for a biopotential amplifier. I'd like to generate a 0.5mV square wave (within 5%) at 200Hz (give or take on the frequency). I'm thinking of ...
0
votes
1answer
100 views

Running LED at different speed using timer

I am new to C programming. I want to program a running LED on my PIC24 (PIC24HJ256GP206) I have 5 LED on my PORT G and have input PORTB (RB0) My program should, if RB0 is grounded (I put jumper on ...
0
votes
0answers
35 views

Connection between two chips with different data clock [on hold]

It is my first question in this site. I'm planning to make CCD board camera. But there are some difficulty in making schematics. I will use the sharp dsp digital output that type is ITU-R BT.656. ...
3
votes
2answers
342 views

What is the meaning (definition) of “current-starving”?

In several circuit descriptions we can find the term „current-starved“, „current-starving“ or „voltage-starved“. Example In chapter 4 (Current-starved voltage-controlled oscillator) we can read: ...
0
votes
1answer
86 views

Questions about LEDs in a circuit [duplicate]

I read statements like ‘An LED has a fixed voltage drop regardless of the current running through it’, but looking at the following examples (using arbitrary numbers), can someone confirm that the ...
0
votes
2answers
36 views

Quick question about phase displacement in AC circuits

Z1, Z2(impedance) and the effective value of I2 is given. My question is whether I can assume phase displacement of the current I, let's say 0º. I can finish the analysis of the circuit easily this ...
1
vote
1answer
63 views

Open Source USB Flash Drive Circuit Anywhere?

I would like to make a removable USB flash drive from scratch. I would probably start from component selection. And because this is not as exciting as some other DIY projects, I haven't found any ...
0
votes
1answer
35 views

Signal Detector (Field Strength Meter)

Hello I have attached a circuit of a Field Strength Meter that I came up with, my target frequency is around 500Mhz. I was wondering if a design like this will even be able to tune to 500Mhz. I am ...
0
votes
2answers
60 views

lm324 if i feed it with Vcc but not grounded it,what the value isee on GND pin?

I have lm324 in my circuit and I connected Vcc pin To 5V, but GND pin is not connected (float), so What the value I see on GND pin ?
0
votes
3answers
135 views

Short analysis of AC circuit

simulate this circuit – Schematic created using CircuitLab For this AC circuit it is known that $$\omega=10^4 \text{rad}/\text{s},L=0.1\text{H}$$ Find capacity of a capacitor, so that the ...
0
votes
1answer
24 views

DAC circuit and ampli op

I'm looking for a DAC in order to convert a digital signal of 8 bits into an analog signal of 0 to 5 volts with an ideal precision of 1 LSB. It is the first time that I look for a DAC and I'm not an ...
1
vote
1answer
95 views

Handling audio signals on a 5v ADC

Some days ago I have made a multiplexed 3x8 LED grid based on Arduino RGB Controller. In my case I don't use RGB but row1, row2 and row3. While I already made some nice animations but I'm not really ...
0
votes
1answer
81 views

radio energy harvesting on WIFI questions

I am building up a radio harvesting circuit on WIFI signal, but I fail. Actually I am very new to antenna and RF aspects.I have several questions about the circuit. First of all, I follow this ...
0
votes
1answer
70 views

reduce from 12 to 7.5 volts and can carry 4 ampere

i have 2 servos operating at 7.5 which each of them consume 4 ampere at stall and i have battery 12 volts.i want to make a circuit, buy a circuit or even know if it i possible to make or buy ...
0
votes
0answers
37 views

why do plug-in LED lights have a special electronic box on the plug? [duplicate]

We purchased LED lights for our kids after having a near fatal carpet burning incident with an incandescent light. We purchased two plug-in LED lights that had a special box around the plug end of the ...
0
votes
4answers
223 views

Placing just an LED in a circuit?

Kirchhoff's law states that “in any closed loop network, the total voltage around the loop is equal to the sum of all the voltage drops within the same loop” What would happen if you placed a LED ...
0
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0answers
25 views

Wave Digital Filter (Basic)

DOWN wave is the reflection, am I right? And is D considered as reflection-free (rf) in dtyeh's illustration? Because the root of the tree is D, there should not be rf on D and since there is no rf ...
2
votes
0answers
94 views

Is it right to apply superposition theorem to the RC circuit with non-zero initial capacitor voltage?

I'm having confusion with applying superposition to simple RC circuit with non-zero initial capacitor voltage. Consider a simple RC circuit series connected with voltage source of step voltage ...
1
vote
0answers
46 views

Clock signal sharpness

I'm currently tuning the termination resistors in the clock circuit. The resistor here is 330 ohms, I got a rippled clock signal like this: I increased both resistors value to 430 ohms and I got: ...
-1
votes
1answer
47 views

5 mA DC Isolated Current Sensor

We are trying to measure the presence of ~ 0-5 mA of DC current in an isolated manner (no shunt resistors). Are there any commercially available solutions?