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Old 31st March 2002, 02:56 AM   #1
SteveA is offline SteveA  United States
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Default ESP 3A amp

I am assembling the 3A amp from ESP. He states to use a "normal" green led. Would this be T1, T1 3/4 or does it matter?
Also, anybody got a recommendation for a heatsink?
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Old 31st March 2002, 08:21 AM   #2
Freddie is offline Freddie  Sweden
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No it doesn't matter. The LED should have the same voltage drop.
But don't change the color.

About the heatsink, I usually use a Multi, 2U 19" enclosure, available from Powerbox.

Which have heatsinks on the sides, the biggest enclosure have a thermal rating of 0,17K/W.

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Old 31st March 2002, 03:05 PM   #3
paulb is offline paulb  Canada
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It's not a Class A amp, so heatsinks are not as critical. But the bigger the better. It depends on what voltage you're running at and what load you're driving (i.e. 4 ohms is worse).
I'm using something like the Wakefield 423K.
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Old 4th April 2002, 11:29 PM   #4
SteveA is offline SteveA  United States
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Thanks for the responses. In the assembly instructions Rod states that C1 can be anything from 1 mf to 10 mf. I have two caps in hand which fit the bill. One is a 4.7 mf electrolytic, the other a 1 mf metal film box cap.

Question: Is there anything to recommend one over the other or does it (as the instructions appear to suggest) really not matter as long as it is between 1 and 10 mf?

Thanks again
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Old 5th April 2002, 12:10 AM   #5
JoeBob is offline JoeBob  Canada
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Well, the film cap would obviously be better. The cap, along with the input impedence determine the -3dB point. With 1uF and 22k it would be around 7Hz. If you need it lower, use more film caps in parallel.
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