Questions tagged [circuit-design]
For questions about the design of circuits. This may cover everything from processing steps to models to high level circuit design issues.
54 questions
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43 views
Are diodes necessary when powering a pump from two separate motor drivers?
When wiring a 12V pump to 2 low-side PWM DC motor drivers in parallel, is it necessary to add any of the four (Schottky) diodes shown in the diagram below? Is there a simple test that can be done with ...
- 101
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38 views
About Royer ZVS LC oscillator modification
I have a question about a modification I tried to make to a ZVS LC Royer oscillator. Basically to perform one experiment that requires hard-switching, I tried to implement a couple of mosfet drivers, ...
1 vote
2 answers
102 views
Dipole antenna calculations
I need a clarification about how to calculate the length of a dipole antenna. For a 1/2 wave-dipole which of the formula is correct? (140/λ) Or (300*10^6/λ)/2 Can a 1/2 wave-dipole dipole work when ...
- 11
-1 votes
1 answer
84 views
Is there a way to short a low voltage circuit remotely without physically touching it?
I'm looking for a way to short a low voltage circuit remotely without having to physically make contact with it. A preinstalled discharge or shorting circuit can't exist in this case. Just any random ...
- 201
1 vote
1 answer
376 views
Converting time constant to bandwidth of 1st order system
When the system is first order: $1/(1+s\tau)$ Why is the bandwidth: $f_{-3db}=1/(2\pi \tau)$? Where did the $2\pi$ come from? Why isn't it simply $1/\tau$? The unit of $2\pi$ is related to radian. But ...
- 13
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68 views
Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
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55 views
How do I draw a circuit for a conducting loop inside a solenoid?
To solve a homework problem, I need to redraw the following diagram in circuit form. The large blue circle represents the solenoid. Inside the solenoid, the two gray semicircles represent a wire loop,...
1 vote
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64 views
What should be the clearance and creepage for the line to line 440 Vac and line to neutral 240 Vac of the three-phase system on PCB?
Also is there any link to calculate this as per the UL and other industrial standards
- 11
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107 views
How to build a 4-bit full adder that shows result on 2 7-segment LEDs, without using Arduino?
I'm required to create a 4-bit full adder (ALU actually), that displays result on 2 7-segment LEDs with both are common cathode, using only 74HC283, CD4511 and some other logic gates. I'm confused on ...
0 votes
2 answers
156 views
Why does a metastable state eventually resolve to a stable state?
I was studying with a book named "Digital design and computer architecture". When I read the part of metastability, it stated this without any additional explanation.. Why does a metastable ...
- 101
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342 views
How to make motor spin the other way
Let’s say I want two motors in parallel in a circuit (so they get the same Voltage), and wanted one motor to spin anti-clockwise and the other clockwise- is it possible? I thought by flipping one of ...
- 13
1 vote
2 answers
642 views
Precisely control voltage output
I think the component name is a rheostat- is that what allows you to control the voltage output please? I want to control it in steps close enough to 0.1 ish volts? So I would like to attach a knob ...
- 13
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1 answer
75 views
How to Supply two different DC voltages using High Current
I'm trying to function a 12V stepper motor(>2.5A) and five 6V servos(>3A). Are there any reliable circuits that can output both these voltages and a high output current since there will be some ...
- 33
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2 answers
203 views
Circuit with Contradiction
What would happen in real life if you made a paradoxical circuit (a circuit whose output is on iff its output is off). Something like this: Would the discrete model break down and the output end up ...
1 vote
1 answer
249 views
Electrical potential and grounding in a circuity, why it works?
I thought I understood the ground concept but now I'm a lot confused. From: Pg.67 Practical Electronics for Inventors - Scherz Paul As it's explained in the book, the first circuity is the one that's ...
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