Questions tagged [smoothing-capacitor]
The smoothing-capacitor tag has no usage guidance.
48
questions
9
votes
5
answers
3k
views
Why does a 2nd capacitor and coil smooth this signal?
I came, more or less accidentally, across this image here:
I understand all circuits and their resulting signal output, except for the last/lowest one. Shouldn't it look like this with one capacitor ...
- 625
5
votes
3
answers
573
views
How Can Non-Parasitic Capacitance Be Excessive When Smoothing Voltage?
I mostly do VHDL/Verilog, and I'm laying out a PCB for a small FPGA project.
The FPGA will operate in a noisy environment. I want to make sure the board has more than enough capacitors to provide the ...
- 593
5
votes
3
answers
516
views
How does this circuit work? (AM receiver)
I do not completely understand how this circuit works:
First, I do not understand how the LC filter selects the frequency. I know that it's impedance is 'infinity' at the resonant frequency, but I ...
- 690
4
votes
2
answers
6k
views
Smoothing a Full-Wave rectifier voltage
I was reading about full-wave rectifiers and came across the schematics below which the capacitor C can smooth its voltage, but I didn't understand one case:
We know that when the rectifier's voltage ...
- 83
3
votes
3
answers
2k
views
Which capacitors to use with voltage regulator IC such as 7805?
Many of the tutorials suggest to use a large smoothing capacitor (tens and even hundreds of uF) with a full wave rectifier but the datasheets of the voltage regulators and some tutorials suggest only ...
- 333
3
votes
3
answers
4k
views
Parallel RC as a filter?
I was looking at an amplifier schematic and saw a curious portion that I realized I wasn't sure what its purpose was.
simulate this circuit – Schematic created using CircuitLab
At first ...
- 55
3
votes
2
answers
6k
views
Do I really need a large smoothing capacitor?
When I design a basic power supply that uses a full wave rectifier, The smoothing capacitor is very large. The output of power supply is 5V and 1A.
The ripple voltage equation is: V = I / (f*C)
f = ...
- 3,814
3
votes
1
answer
473
views
How should I drain a capacitor in a rectifier circuit?
I am trying to learn how to drain a capacitor after disconnecting power from a rectifier circuit.
Specifically what I have is a step down transformer from an old wall wart charger that I have modified....
- 107
2
votes
2
answers
1k
views
Function of capacitor on the output of a bridge rectifier
What is the function of capacitor C in this diagram?
- 37
2
votes
3
answers
2k
views
Can you smooth mains A.C?
I know you can smooth DC with a capacitor but what if you have an unstable mains AC voltage (here in the UK that's 240V 50Hz)? Are there components that can be used or products one can make/buy for ...
- 129
2
votes
2
answers
1k
views
Capacitor in parallel with relay coil backfires on contacts
I've got a smoothing capacitor(2,2uF) C1 in parallel with relay coils inside a fullwave diode bridge.
When the circuit is closed through contacts in pre-relay RLY1 it first gives me, almost everytime ...
- 21
2
votes
2
answers
873
views
230VAC to 230VDC converter for flicker free LED construction lights for use in videography/photography
We use LED construction lights for illuminating a photo or video set. As espected the lights flicker with the mains frequency. While in some cases this can be compensated with the right camerasettings ...
- 123
1
vote
1
answer
122
views
Why does the capacitor discharge after the peak of AC voltage (smoothing)?
Why does the capacitor discharge (used as a battery to provide voltage to the resistor) after the peak of the alternating voltage (after the voltage reaches the highest value and goes on to decrease ...
- 11
1
vote
2
answers
12k
views
How may I select a smoothing capacitor to mitigate LED flicker without the use of a scope?
I recently replaced a set of incandescent bulbs from the interior of my old car with some very inexpensive festoon LEDs. Unfortunately the LEDs are not 100% compatible with the lighting system as ...
- 325
1
vote
2
answers
4k
views
AC mains LED flicker
I have a number of simple LED strip lights, purchased to replace fluorescent tubes in a kitchen. Having installed the first ones, they have a noticeable flicker (to me, but not my wife!) on moving ...
- 21