Is it OK to add a large bank of caps outside the amp? - diyAudio
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Old 14th November 2004, 10:50 PM   #1
mattjk is offline mattjk  United States
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Default Is it OK to add a large bank of caps outside the amp?

I built an amp in a small case, but I want to add a couple of 82000uf caps, an addition to the 2 10000uf caps that are inside.

Are there any negatives to this? I've seen some tube amp manufacturers do this.

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Old 14th November 2004, 11:21 PM   #2
quasi is offline quasi  Australia
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Default Re; external capacitors

There should be no problem with this provided you do it in a safe manner i.e. housed. Depending on the amp the voltage across the capacitors could be lethal. Make sure the capacitors working voltage is high enough.

The only concern would be whether your rectifier could handle the larger instantaneous load while these charge up so I would check this.

Place an additional discharge resistor across them too.

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Old 14th November 2004, 11:27 PM   #3
mattjk is offline mattjk  United States
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thank you for your reply.

I plan on incorporating a manual soft start switch, but for now, I leave the amp on all the time, and turning it on doesn't seem to be a problem.

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Old 15th November 2004, 03:19 AM   #4
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I'm glad I found this thread!

That just answered a question I had about the amp I just made.

I plan on having larger caps external from the PCB so they don't take up precious circuit board space. However, they will be inside the enclosure.

I guess the wires need to be thick for the amps to get the best peak current from the externally mounted caps.
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Old 15th November 2004, 03:18 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi e1708,
Consider using thinner wires to connect the extra bank of caps into the board.
The resistance will create a CR filter and a few hundred milliohms here might better suit your needs.
Then the onboard caps should be sized to meet the short term peaks.
regards Andrew T.
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