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Elliot P3A question...
Elliot P3A question...
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Old 30th April 2002, 11:51 PM   #1
JoeBob is offline JoeBob  Canada
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Default Elliot P3A question...

Well, I'm going to build a Rod Elliot P3A amp as soon as I match all my transistors but I've only got one question... In the P3A article he says that 300VA would be fine for a pair of amps. Does everyone agree with this? It seems rather low, and I'll be running it with a 4 ohm load and I'd obviously like as much power as possible.

Are there any other sudjestions on the VA of transformer I should use per channel?
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Old 1st May 2002, 12:08 AM   #2
Jocko Homo is offline Jocko Homo  United States
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Do I need to sell you a transformer too? [joke]

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Old 1st May 2002, 12:09 AM   #3
JoeBob is offline JoeBob  Canada
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LOL Actually I already have a PSU for it, 1500VA 120000uF +/- 35V, just wondering how many channels I could power with it...
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Old 1st May 2002, 12:13 AM   #4
Jocko Homo is offline Jocko Homo  United States
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Build it and find out. Best way to learn. Probably more than you would think is the answer.

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Old 1st May 2002, 12:19 AM   #5
JoeBob is offline JoeBob  Canada
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Hmmm... Actually, that's a really good answer. I think I'll do just that..
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Old 1st May 2002, 03:31 AM   #6
tiroth is offline tiroth  United States
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JoeBob, my amp has 5 channels on a pair of 400VA xforms. This may be low by the standards of the forum, but it works well for me. I'm only shooting for 60W into 8 ohms though.
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Old 1st May 2002, 08:43 AM   #7
Vivek is offline Vivek  India
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I am using a 600VA transformer for the Project 3A amp.
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Old 1st May 2002, 01:59 PM   #8
paulb is offline paulb  Canada
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I'd be more worried about the dissipation of the output transistors, especially into a 4-ohm load. Rod has some very specific recommendations about voltage maximum for 4-ohm loads. You can parallel more output transistors; I know he suggested this in the previous (project 3) version.
I'm very pleased with this amp, JoeBob, when you're done see if you can tell the difference with the LM3886 one you built. I can.
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Old 1st May 2002, 02:13 PM   #9
NickC is offline NickC
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i built the 3a with 280va 28 0 28. and used it to power 4 ohm as the amp was bridged for 200 watts total. works fine. heed paulb advise though very important for 4 ohm even rod has said something about the transistors.
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Old 1st May 2002, 02:37 PM   #10
JoeBob is offline JoeBob  Canada
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I do intend to parallel the output transistors, better safe then sory.
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