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Old 26th May 2004, 01:20 PM   #1
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Default power supply capacitor questions

i was wondering what capacitors i should be getting for the power supply use in a home setting for 200 - 300 watt amp
i bought some 4700uF rated at 63volts
they came and they are smaller then i thought they would have been
i was wondering what kinda caps i should be looking for and if i selected the correct ones
any information on what capacitors and where to get them would be greatly appreciated..
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Old 26th May 2004, 01:56 PM   #2
Stocker is offline Stocker  United States
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what are your rail voltages?
what will the load be?
what is an acceptable level of ripple?
what is an acceptable level of voltage droop?
what class is the amplifier?

the answer is...it depends.
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Old 26th May 2004, 02:35 PM   #3
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200watts amp
-+40 volt rails
class ab amp
load will be 4 or 8 ohms
v ripple and v droop doesnt matter
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Old 26th May 2004, 02:58 PM   #4
cpemma is offline cpemma  United Kingdom
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Quote:
Originally posted by roofingboom
v ripple and v droop doesnt matter
You don't need any, then.

There's a formula for cap size based on the ripple range and the load current, Rod Elliott's PSU guide has it and gives some good guidance.
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Old 26th May 2004, 04:07 PM   #5
K-amps is offline K-amps  United States
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Quote:
Originally posted by roofingboom
200watts amp
-+40 volt rails
class ab amp
load will be 4 or 8 ohms
v ripple and v droop doesnt matter

How can you get 200 watts into 8 ohms with +/- 40v rails? (Unless you bridge). I thought in real life situations, you'd need at least +/- 65vdc rails.

K-
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Old 26th May 2004, 04:36 PM   #6
Stocker is offline Stocker  United States
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[QUOTE]Originally posted by cpemma

You don't need any, then.


LOL
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