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Old 14th July 2018, 08:32 PM   #1
Nelson Pass is offline Nelson Pass  United States
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It's a slow day. Time for a little entertainment - a micro project!

Someone sent me a request for a simple 1 watt amplifier.

How could I resist?

My answer:

Assuming that your preamp can put out 2 volts (and it should),
a 1 watt design would be the easiest thing in the world.

Attached is an example.

I will put it up on the Pass Labs forum at diyaudio and see
what kind of suggestions it gets for construction and improvement.

Feel free to post questions.

"Zen Mod" will likely be the first to take the bait.


The following draws 1.5A off a 19V computer desktop supply and gets
1 watt into 8 ohms at about .5% THD.

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File Type: gif FAOW.gif (9.3 KB, 1718 views)

Last edited by Nelson Pass; 14th July 2018 at 08:42 PM.
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Old 14th July 2018, 08:39 PM   #2
Michael Rothacher is offline Michael Rothacher  United States
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I love it. Let's have some real flea-power fun!
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Old 14th July 2018, 08:44 PM   #3
MEPER is offline MEPER  Denmark
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I would say…...why not the ACA instead of this?
The idle current is the same so efficiency much better in ACA amp?
So if heat generation is the same as the ACA......what is be benefit other than it is slightly more simple?
How does it sound?
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Old 14th July 2018, 08:47 PM   #4
Nelson Pass is offline Nelson Pass  United States
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Purely entertainment.
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Old 14th July 2018, 08:54 PM   #5
MEPER is offline MEPER  Denmark
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Ok......it looks a bit like a very simple MoFo amp.....but this one has little bit of gain?
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Old 14th July 2018, 09:55 PM   #6
Zen Mod is offline Zen Mod  Serbia
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here's ZM

can' have a gain , being source follower
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Old 14th July 2018, 10:03 PM   #7
Zen Mod is offline Zen Mod  Serbia
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why not doing it as Beast with One Thousand BC109s ?

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Old 14th July 2018, 10:36 PM   #8
adason is offline adason  United States
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BC550...that's what i got (i know bjt)
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Old 14th July 2018, 11:29 PM   #9
Dennis Hui is offline Dennis Hui  Canada
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Quote:
Originally Posted by Zen Mod View Post
why not doing it as Beast with One Thousand BC109s ?

Beast with One Thousand 2SJ109
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Old 14th July 2018, 11:32 PM   #10
Zen Mod is offline Zen Mod  Serbia
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will check what I have of Germaniums , on Monday

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