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mearvk
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Why do we branch off and go to ground on bypass capacitors instead of just putting a capacitor inline? Surely the effect would be the same?
mearvk said:I don't want to delve deeply into the theoretical for what is a relatively practical question.
Do certain capacitances smooth certain frequencies better than others? If so, what capacitances work best with audio applications?
Thanks.
mearvk said:Hi all.
Quick question. I'm going to make a nice full-bridge rectifier setup for general purpose AC to 'clean' DC applications. This way I can just connect a transformer to it and get going.
My question is, is there a correlation between the size of the decoupling caps and the amount of power the DC device will be using? Smaller caps for less wattage and larger ones for bigger amps? How do I know what size caps to throw on my breadboard and how many for super clean DC out?
I have a prototype setup done which uses two 1000uF caps in parallel but I think that may be overkill since most of the circuits use much less. But again, I was mine to be general purpose, up to say 8 amps at 20-25 volts but probably much lower. The power it produces is cleaner than the pure output for the the rectifier but it's not setting any records - verified it on my scope. Yeah I could do it by guess and check but rather start in the ballpark.
Cheers.
That's a bit like saying you don't want to get involved with arithmetic when you go shopping. Calculations go with the territory when you are designing and building electronics circuits. 'Big' capacitors are not cheap and, if you don't want to get involved with simple calculations, you could spend much more than you need or end up needing to add more capacity later on.mearvk said:I don't want to delve deeply into the theoretical for what is a relatively practical question.
Does ordering matter with capacitors? Does 1x, 2x, 4x, 10x produce the same smoothing output as 10x, 2x, 4x, 1x? Do four 1x caps provide the same smoothing as 1 4x cap?
Do certain capacitances smooth certain frequencies better than others? If so, what capacitances work best with audio applications?
Thanks.
Bypass capacitors are used to reduce noise and improve the stability of a circuit by providing a low-impedance path to ground. Grounding the bypass capacitor allows it to effectively filter out any high-frequency noise present in the circuit.
No, bypass capacitors must be grounded to function properly. Without a ground connection, the capacitor will not be able to filter out high-frequency noise and may even introduce additional noise into the circuit.
The value of a bypass capacitor depends on the specific circuit and its requirements. Generally, a larger value capacitor will provide better filtering, but it is important to select a value that is appropriate for the frequency range of the noise and the desired circuit performance.
Yes, it is common to use multiple bypass capacitors in a circuit to provide effective filtering at different frequencies. These capacitors should be placed strategically throughout the circuit, with the closest one to the power supply being the largest value.
Without bypass capacitors, high-frequency noise can interfere with the proper functioning of a circuit and cause instability or malfunctions. Bypass capacitors are essential for ensuring a clean and stable power supply for electronic devices.