Progress so far

Kilowatt · 13th August 2002, 11:51 PM

No, though you have probably been wondering, I'm not dead, I just haven't been able to get on the internet for the last few weeks because Klez corrupted every last file on my computer and it has been out of service until just now (as in like, the last few minutes). But as always, I am back.

So here's what's going on. I have the two Leach Amp channels done, and I am working on the chassis for my home hifi amp now. I am partially done with one of my modified P3a midrange amps, and am working on layouts for the tweeter amps and the preamp. I will post pictures soon.

I was wondering, how big of transformer I should use for an 2 x 40W single ended class A amp (similar to Zen) with a regulated supply? Think 625VA is enough?

Nelson Pass · 15th August 2002, 09:43 PM

2 x 40 = 80 watts out

efficiency of Zen Classic = .2

power draw = 400 watts.

power factor =~ 2, so transformer will heat as if 800 watts.

needs 1200 VA (watt) transformer.

So use 1 per channel, or build penultimate Zen, with
40% efficiency.

Kilowatt · 15th August 2002, 09:50 PM

Thanks. That's a mighty big transformer, I think I will use a design like the penultimate Zen when the time comes.

13th August 2002, 11:51 PM	#1
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	Progress so far No, though you have probably been wondering, I'm not dead, I just haven't been able to get on the internet for the last few weeks because Klez corrupted every last file on my computer and it has been out of service until just now (as in like, the last few minutes). But as always, I am back. So here's what's going on. I have the two Leach Amp channels done, and I am working on the chassis for my home hifi amp now. I am partially done with one of my modified P3a midrange amps, and am working on layouts for the tweeter amps and the preamp. I will post pictures soon. I was wondering, how big of transformer I should use for an 2 x 40W single ended class A amp (similar to Zen) with a regulated supply? Think 625VA is enough? __________________ - "With power amplifiers, negative feedback is a good thing, and positive feedback can induce destructive oscillation, but with people, positive feedback is a good thing, and negative feedback can induce destructive oscillation"

15th August 2002, 09:50 PM	#3
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	From the man himself! Thanks. That's a mighty big transformer, I think I will use a design like the penultimate Zen when the time comes. __________________ - "With power amplifiers, negative feedback is a good thing, and positive feedback can induce destructive oscillation, but with people, positive feedback is a good thing, and negative feedback can induce destructive oscillation"

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15th August 2002, 09:43 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	2 x 40 = 80 watts out efficiency of Zen Classic = .2 power draw = 400 watts. power factor =~ 2, so transformer will heat as if 800 watts. needs 1200 VA (watt) transformer. So use 1 per channel, or build penultimate Zen, with 40% efficiency.