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Old 11th February 2003, 04:19 PM   #1
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Default what would people advise for my first amp?

i have not built an amplifier before and would like to build one.

what type of amplifier would people suggest, and which websites should i look at?
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Old 11th February 2003, 06:58 PM   #2
audioPT is offline audioPT  Portugal
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try this: Rod's Web Site
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Old 11th February 2003, 07:34 PM   #3
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which one?

Edit: This one? http://sound.westhost.com/project19.htm
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Old 11th February 2003, 07:39 PM   #4
audioPT is offline audioPT  Portugal
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Start by the easyest

60-100W Power Amp

Easy to make.

Pay attention to the Output transistors.

There are some counterfeit.
In doubt, read Rod's article and use substitutes
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Old 11th February 2003, 07:52 PM   #5
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Quote:
Originally posted by audioPT
Start by the easyest

60-100W Power Amp

Easy to make.

Pay attention to the Output transistors.

There are some counterfeit.
In doubt, read Rod's article and use substitutes
ok, what voltage/ampage powersupply should i build? i want to be able to use it again and for more powerful amps, 60v?
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Old 11th February 2003, 08:21 PM   #6
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depends ofcourse also on the speakers you have (or are planning to build). If you have 90+ dB/w sens. you could also make some small 10-30W, even more easy to build.
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Old 11th February 2003, 09:20 PM   #7
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Quote:
Originally posted by Hanzwillem
depends ofcourse also on the speakers you have (or are planning to build). If you have 90+ dB/w sens. you could also make some small 10-30W, even more easy to build.
the speakers i have are ones from a shop, ill have to check what they are.
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Old 11th February 2003, 09:26 PM   #8
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Default I gave up on that

Quote:
Originally posted by Matttcattt


ok, what voltage/ampage powersupply should i build? i want to be able to use it again and for more powerful amps, 60v?
I went through some of the same questions prior to deciding on the P3A. After trying to plan out which speakers I would drive with what amp over the next 10 years, I decided it was completely fruitless and dropped the $40-50 on a 25VCT 300VA (or 400-ish, I can't recall) torroid and felt much better.

In the future, I might try an Aleph or a Zen or a different AB or this or that. Trying to optimize my transformer for all of these unknowns wasn't worth it to me.

I have found it challenging just to get the 'right' parts, without figuring out the long list of permutations of possible substitutions, especially with the possibility of recycling into a future project.

Good luck and happy building.

S.
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Old 11th February 2003, 09:39 PM   #9
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would this power supply be ok? http://sound.westhost.com/project04.htm

would a 300VA Toroidal Mains Transformer with 2x30volt secondary windings be ok for this power supply? if not, i can get hold of 500VA (it only comes in 2x40v output) or 625VA ones.

the 300VA version is 30, the 500VA is 35 and the 625VA is 40.
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Old 12th February 2003, 07:23 PM   #10
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2x40v sounds a little high...you might want to run that by Rod Elliot and see what he says. I'd use at least 500va for the toroid for a stereo p3a though. 625 is even better.

-Matthew K. Olson
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