Elliot P3A question...

JoeBob · 30th April 2002, 11:51 PM

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?

Jocko Homo · 1st May 2002, 12:08 AM

Do I need to sell you a transformer too? [joke]

Jocko

JoeBob · 1st May 2002, 12:09 AM

LOL Actually I already have a PSU for it, 1500VA 120000uF +/- 35V, just wondering how many channels I could power with it...

Jocko Homo · 1st May 2002, 12:13 AM

Build it and find out. Best way to learn. Probably more than you would think is the answer.

Jocko

JoeBob · 1st May 2002, 12:19 AM

Hmmm... Actually, that's a really good answer. I think I'll do just that..

tiroth · 1st May 2002, 03:31 AM

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.

Vivek · 1st May 2002, 08:43 AM

I am using a 600VA transformer for the Project 3A amp.

paulb · 1st May 2002, 01:59 PM

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.

NickC · 1st May 2002, 02:13 PM

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.

JoeBob · 1st May 2002, 02:37 PM

I do intend to parallel the output transistors, better safe then sory.

30th April 2002, 11:51 PM	#1
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	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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1st May 2002, 12:08 AM	#2
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Do I need to sell you a transformer too? [joke] Jocko

1st May 2002, 12:09 AM	#3
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	LOL Actually I already have a PSU for it, 1500VA 120000uF +/- 35V, just wondering how many channels I could power with it...

1st May 2002, 12:13 AM	#4
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Build it and find out. Best way to learn. Probably more than you would think is the answer. Jocko

1st May 2002, 12:19 AM	#5
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	Hmmm... Actually, that's a really good answer. I think I'll do just that..

1st May 2002, 03:31 AM	#6
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	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.

1st May 2002, 08:43 AM	#7
Vivek diyAudio Member Join Date: Nov 2000 Location: Bangalore, India	I am using a 600VA transformer for the Project 3A amp.

1st May 2002, 01:59 PM	#8
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	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.

1st May 2002, 02:13 PM	#9
NickC diyAudio Member Join Date: Dec 2001 Location: Earth	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.

1st May 2002, 02:37 PM	#10
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	I do intend to parallel the output transistors, better safe then sory.