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#1 |
diyAudio Member
Join Date: Nov 2001
Location: Montreal, Canada
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Well, I'm going to build a Rod Elliot P3A amp as soon as I match all my transistors
![]() Are there any other sudjestions on the VA of transformer I should use per channel? |
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#2 |
Banned
Join Date: Feb 2002
Location: As far from the NOSsers as possible
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Do I need to sell you a transformer too? [joke]
Jocko |
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#3 |
diyAudio Member
Join Date: Nov 2001
Location: Montreal, 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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#4 |
Banned
Join Date: Feb 2002
Location: As far from the NOSsers as possible
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Build it and find out. Best way to learn. Probably more than you would think is the answer.
Jocko |
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#5 |
diyAudio Member
Join Date: Nov 2001
Location: Montreal, Canada
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Hmmm... Actually, that's a really good answer. I think I'll do just that..
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#6 |
diyAudio Member
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
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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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#7 |
diyAudio Member
Join Date: Nov 2000
Location: Bangalore, India
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I am using a 600VA transformer for the Project 3A amp.
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#8 |
diyAudio Member
Join Date: Jun 2001
Location: Calgary
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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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#9 |
diyAudio Member
Join Date: Dec 2001
Location: Earth
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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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#10 |
diyAudio Member
Join Date: Nov 2001
Location: Montreal, Canada
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I do intend to parallel the output transistors, better safe then sory.
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