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Projects to use these power supplies: suggestions please!
Projects to use these power supplies: suggestions please!
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Old 14th March 2017, 06:23 AM   #1
VictoriaGuy is offline VictoriaGuy  Canada
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Join Date: Dec 2008
Location: Victoria, BC
Projects to use these power supplies: suggestions please!
Default Projects to use these power supplies: suggestions please!

While waiting for delivery of my toroid power transformer for the Aleph J project, I started digging into my parts collection....

I found these power supplies- two of them- at the back of the shelf:
24v DC @5 amps (regulated)

The transformers are Hammonds:
225VA
Pri: 115/230v
Sec: 55v c.t.

So if necessary, I could re-wire the primaries to get 27.5 v c.t., I suppose.

What's a good (Class A) (beginner/intermediate) project that could put these to good use? A ready-made PCB isn't necessary, but a PCB layout would be an asset.

Thanks!
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Old 14th March 2017, 06:35 AM   #2
BesPav is offline BesPav  Russian Federation
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Join Date: May 2011
Location: Russia, Moscow
Quote:
Originally Posted by VictoriaGuy View Post
What's a good (Class A)

Drop your fear and build this:

http://www.amb.org/audio/beta24/

http://www.amb.org/forum/beta24-in-p...ss-a-t396.html
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Old 14th March 2017, 06:45 AM   #3
VictoriaGuy is offline VictoriaGuy  Canada
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Join Date: Dec 2008
Location: Victoria, BC
Projects to use these power supplies: suggestions please!
Thanks for the very quick reply and for the suggestion.

I'm not afraid, but I'm 'on a budget' ... .. and that does look like a bit 'rich' project....

I'm wondering how my power supply parts will work with that amp, which requires +/- 36 v regulated. Also wondering about the VA limit...
Later....<edit>....
Reading in your 2nd link I see for the 'Class A version':
Quote:
The output stage unregulated power supply voltage needs to be dropped in half, from 30V to 15V, fully loaded. This means using a 12V+12V power transformer (or 24V CT). It should be rated 350VA if using a single transformer for both channels, or use one 200VA transformer per channel. As a consequence of the reduced voltage, the 10000uF bulk capacitors' voltage rating could also be reduced from 50V to 25V. You can use higher capacitance if you wish.
So this would work with my re-wired transformer 27.5v CT...and I'd just build a smaller supply for the +/- 24 v regulated
Quote:
The σ22 regulated power supply should be configured to output 24V instead of 36V. The recommended power transformer is thus changed to 25V+25V or 50V CT, rated 30VA if using a single transformer for both channels, or use one 15VA transformer per channel.

Last edited by VictoriaGuy; 14th March 2017 at 06:56 AM. Reason: Followed the links and did a bit of reading
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Old 14th March 2017, 06:57 AM   #4
Dennis Hui is offline Dennis Hui  Canada
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Join Date: Aug 2002
Location: Toronto, Canada
Projects to use these power supplies: suggestions please!
Hi VictoriaGuy,

What about an ACA running on 24VDC rail?

Dennis
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
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Old 14th March 2017, 07:16 AM   #5
BesPav is offline BesPav  Russian Federation
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Join Date: May 2011
Location: Russia, Moscow
Quote:
Originally Posted by VictoriaGuy View Post
Thanks for the very quick reply and for the suggestion.

You are welcome!

Quote:
Originally Posted by VictoriaGuy View Post
I'm not afraid, but I'm 'on a budget' ... .. and that does look like a bit 'rich' project....

Yup...

Being "on a budget" you can build Pass F5, or even composite it with some opamp like this:
Common Emitter OPS?
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