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0
votes
1answer
51 views

Drum machine circuit diagram

I'm having trouble understanding this circuit. Can someone help me get through it? I'm trying to understand what the signal is doing from start to end but keep running into electrical deadlocks.
1
vote
2answers
47 views

Any good method for the power down sequence?

In my circuit, +12V would be supplied by an external power source. After two regulators, two more voltage source(+5V and +3.3V) would be produced and supply power to adc AD7682.Because of the maximum ...
0
votes
1answer
45 views

Circuit Problem

RT = R6 + [ R5 || ( [R1||R4] + [R2||R3]) ] = 7.2 KOhm IT = 8 / RT = 1.11mA I2 ( current through R5) = (It Rt') /R5 where Rt' is everything excluding R6 My question is what is the easest way to ...
2
votes
4answers
174 views

Trace width and spacing

I'm designing a PCB board (low current, low frequency) mainly consisting of low frequency SPI and analog sensors. Are wider traces better or does it not matter? And which is better, consistent trace ...
0
votes
1answer
55 views

Norton Equivalent/Short Circuit

Just having a little trouble understanding what results from short circuiting. The bottom circuit is the one we are given in the question, and we are asked to obtain the Norton equivalent. The above ...
-1
votes
0answers
71 views

Will this circuit function? [duplicate]

I have this circuit, based on this. I already have a question about this here, but it was getting really long, and hard to read. I created this to make it easier. My circuit: I use an 11.4V ...
0
votes
2answers
161 views
+200

Problems driving electromagnetic mirror

EDIT: The question was completely edited because the major problem - overloading - was solved. One of the units in the OpAmp was damaged, so it was malfunctioning when connected to the load. ...
1
vote
4answers
1k views

Will my circuit work?

I have a circuit that I believe will work, but I was hoping someone could double check? Removed image to make room for edit. - Original schematic In my circuit, I use a MOSFET, a photo-interrupter, ...
1
vote
3answers
83 views

Determine break in long circuit

I have a circuit of switches like this. The switches are a long way from the supply and a long way from each other. ...
1
vote
0answers
20 views

How to calculate average delay time of circuit having several possible transition states

Is it possible to calculate average delay for all possible states directly without calculating them individually using Xilinx or with Cadence.
0
votes
0answers
44 views

How an array of N bits is represented in computer hardware? [closed]

Is it a repetition of a circuit for N times? Or the signals are "sequential" along the same wire/s?
1
vote
1answer
107 views

Basic FM circuit

I have been messing around with a basic FM transmitter circuit, and I want to have a better explanation on how it works. I have searched around and found nothing. Can someone please explain how the LC ...
0
votes
3answers
89 views

Connect USB to microprocessor lacking a output port?

Sorry I'm sure this is a very simple answer but I know very little about how it works beyond serial ports and USB adapters for interacting with PCB circuits. I've taken apart an old junk flip ...
0
votes
2answers
59 views

How to design a power switching circuit using a photo-interrupter

Okay. I'm completely at a loss here. I was trying to design a switching circuit for a 3A load (Solenoid) using a photo-interrupter. I got to about here: But I have no idea what to look for in my ...
1
vote
2answers
97 views

Two relays for DRL on a car

I am trying to make a circuit for my newly installed DRL (Day running lights), what I am trying to do is have the DRL run all the time, turn off when using high beam, dimmed when headlights are on. I ...
0
votes
4answers
105 views

My thought on the reverse polarity protection

I am now designing a power reverse polarity protection circuit for my system. I found that most methods used for the protection would cause voltage drop in the power path. Even the MOSFET, which has ...
0
votes
3answers
87 views

Op-amp based audio amplifier not working

I have a problem with audio amplifier I am trying to build. Given my ignorance, I cannot figure out how to fix the issue. There is absolutely no sound on the output. This is what I have assembled: ...
1
vote
3answers
55 views

Would having no power supply but a large input signal damage the amplifier?

I am now learning about the power sequence of the circuit. And wonder that as every amplifier has its own limited input voltage (for example: ADA4004's input limit is V− < VIN < V+), would the ...
0
votes
1answer
45 views

Controlling AC devices using ATmega8

I have an microcontroller ATmega8, TRIAC MOC3083 and thyristor M166P. I need to develop and device which will turn on/off lamp(220V). But while I'm developing I don't want work with AC 220V now, DC ...
0
votes
2answers
72 views

How is this 3 VAC power supply charging this 18 VDC battery? [closed]

My cheapo 18V Black and Decker cordless drill recently died, and thinking I could maybe fix it, I took everything apart and then couldn't figure out how it was ever working in the first place! Here's ...
0
votes
1answer
24 views

Interpretation of rating of the primary voltage of a real transformer [duplicate]

The rating of a real transformer is 15 kVA , 2300/230-V then can we say that the primary rms is 2300 V or can we say that the secondary rms is 230 V or both. To clarify further, suppose to solve for ...
1
vote
1answer
80 views

2 Transistor XOR Cell Floating Output Problem

I designed the following 2T XOR cell for my full adder purpose: Theoretically it gives correct output for all input combinations. But on Tanner Eda using 180nm technology 5V supply, it gives logic ...
0
votes
0answers
33 views

WeMo Wireless Light Switch US convert to be used in UK?

I am in love with this thing and just cannot believe that it runs 120V 15A. Step down transformer would be too big since this thing should fit into the wall. http://www.belkin.com/us/p/P-F7C030/ ...
0
votes
4answers
95 views

Can a 5V regulator connect directly to a voltage divider to obtain a 2V output?

In my circuit, a lm78l05 is used to provide +5V voltage to other parts. And now I need another +2V source to shift my input signal from +-2V to 0~4V as the ADC ad7682 limits the input signal range ...
3
votes
4answers
414 views

How can one make an analog voltage memory circuit?

I am looking for a circuit that can, on input, remember a certain voltage and output that voltage indefinitely even after the input has been taken away. The circuit should not change its output until ...
5
votes
2answers
198 views

What type of oscillator is this? (Theremin Project. Variable Pitch / LC Oscillator)

I found this oscillator at a Theremin project pdf. I simulated the circuit, and found that the output (left wire) oscillates at 236.5 kHz. This circuit is referred to as "Variable Pitch ...
-1
votes
1answer
58 views

How to optimize wiring of Christmas lights in parallel and in series? [closed]

Suppose we want to wire some Christmas lights. Should we do this in parallel, series, or both parallel and series? The answer is both parallel and series since if every light was in parallel the cost ...
2
votes
2answers
145 views

High resistance voltage divider

I am trying to create simple variable voltage divider circuit, with several constraints that are causing me to look for alternative solution. Constraints: The input voltage is 1.5 V Maximum R1 is 5 ...
2
votes
3answers
449 views

Logic design to circuit — how is it generally done?

So I've designed this CPU with purely logical components (basic logic gates), now how would I go about converting it into a circuit? I know that logical gates can be implemented using transistors, but ...
2
votes
1answer
95 views

Which software is used for producing those schematic sketch? [closed]

It's a while that in the internet I'm finding schematics with hand-made pencil drawing style. I've tried to search a little bit for the software used to make them but I didn't find it. Any advice? ...
0
votes
1answer
36 views

How can I modify the Chipolo circuit to support earlier versions of Android?

I have been trying to find out more of the circuit design of Chipolo and would like to modify it so that it can support earlier Android versions because it can only support Android running version 4.3 ...
0
votes
1answer
84 views

A small circuit with two diodes

We have circuit like this: There's no internal resisters in batteries. Is \$\frac{I}{J}\$ equal to zero? If it is nonzero what is the voltage between the ends of the lamp (assuming the lamp has ...
2
votes
4answers
76 views

Use of different formulas for capacitor impedence (phasors)

I'm confused about why I see two different formulas for calculating capacitor impedance \$Z_{cap}\$ using phasors. For one formula in my text, I see: $$Z_{cap} = \frac{1}{jwC}$$ And another I see: ...
0
votes
1answer
56 views

Cant find solution of Ramp function

This is more of a mathematics question than an electronics question but what is the solution of this differential equation $$α = \frac{V}{RC} + \frac{đV}{đt}$$ This solution gives the time response ...
0
votes
2answers
110 views

Resistor required for capacitor?

I'm currently working on some simple circuits to learn about circuitry, and being a Physics major I have a pretty good grasp of the mathematics and concepts, but I'm a little confused about ...
4
votes
5answers
860 views

Is it possible to make a complete analogy between electricity and something more graspable? (e.g. fluids)

A similar question has been asked here, but mine is more general. Here is the background: it seems to me that electricity is not so intuitive as it may sound. For example, many (unskilled, as I am) ...
0
votes
2answers
65 views

Wien bridge using single potentiometer

I'm making a function generator which works in the audio range for a college project. I'm not allowed to use microcontrollers or any digital chips. So I'm using a Wien Bridge oscillator with a pot to ...
2
votes
1answer
68 views

Toggle battery powered LEDs

I am helping to build a costume prop that has four LEDs lights on it (1 white and 3 amber). This device is worn on the wrist, so space for power is limited- a 9V battery or something that will fit in ...
5
votes
3answers
427 views

Theory question about “j” imaginary unit (AC circuit analysis)

I have just started to learn about AC network analysis and have some questions about "j" (or "i" on my calculator), the imaginary unit. My book doesn't go into a great deal about this, and jumps ...
3
votes
1answer
243 views

Not sure if my calculation is correct, can anyone check this RC circuit for me?

Hello everyone, so in my book I decided to do this practice question but failed to notice that the answer was not given in the back of the book. If anyone can help me confirm my answer I would much ...
1
vote
0answers
46 views

what is the approach to design edge triggered d flip flop? [closed]

i know the circuit. I implement it using verilog and it giving result correct. like when we have to design any digital circuit we draw truth table. Optimize circuit using K-map and then implement. In ...
3
votes
3answers
130 views

how does current go to infinity in an ideal LC circuit at resonance?

Consider an ideal LC series circuit, excited by a sinusoidal source at resonant frequency. Assume zero initial conditions, for capacitor voltage and inductor current. simulate this circuit ...
3
votes
4answers
133 views

How to read this basic schematic?

I need to build a circuit where light is converted to sound. The light falls on a CDS cell and the current is passed through the NPN transistor to amplify it. I know this is a very simple ...
0
votes
3answers
63 views

How to measure the resistance of digital potentiometer AD5241 in circuit when power on

I have designed a transimpedance amplifier including a digital potentiometer AD5241. The circuit is showed below. I want to test the AD5241 to make sure it works as designed. simulate this ...
0
votes
2answers
89 views

Draw a finite state machine for a welding machine

I am trying to draw a fsm for a welding machine. So far I have the following table, which I think is right.. The system has three normal states: stopped, started, and welding. It will only transition ...
0
votes
1answer
61 views

Laser activated switch using a photo-transistor

I would like to make a laser activated switch using a photo-transistor or an LDR, by which I can switch off the lights in a room from a long distance. I just have to point the laser and it will detect ...
-1
votes
1answer
82 views

How to Control a 3D Printer Extruder [closed]

I am trying to control a 3D Printer Extruder that I got online. I know that for the most part, a person would just plug this in to a circuit board and it would just work. I want to make my own circuit ...
1
vote
2answers
99 views

Variable Voltage Using PWM and Low Pass Filter

I am trying to control a steady DC output voltage using a Micro controller with a PWM duty cycle. With the current schematic, the Voltage on Vout is pulsing along ...
2
votes
2answers
153 views

circuit protection feedback

The is the simulated version of the schematic. I have designed a protection circuit for my pcb and I would appreciate having some feedback before starting the PCB design. The circuit is broken down ...
0
votes
1answer
53 views

I would like to ask if my answer to this simple circuit is correct

The problem is to find the values of Vx and i3. I was reviewing DC using KVL and KCL and I would like to check if I got the answers right!