I'm looking for a low power (<10W) amp schematic

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#9
Bricolo - You could try the Mini-Aleph (it was the precursor to the Aleph-X over on the Pass Labs forum).

With respect to your 3-conductor headphone cable, couldn't you just run the + to the + of the SoZ and the - to its - and leave the signal ground hanging? (Or attached to a little ground post internal to the unit?)

Erik
 
#10
eLarson said:
With respect to your 3-conductor headphone cable, couldn't you just run the + to the + of the SoZ and the - to its - and leave the signal ground hanging? (Or attached to a little ground post internal to the unit?)

Erik
Click to expand...
Headphones right and left channels share a common ground wire. The SoZ, if built for stereo, needs separate "ground" wires for each channel because it's differential output. So no, that wouldn't work.
 
#12
I don't have a schematic handy, so can't check grounding schemes, but the JLH is 10W, I believe.
Don't forget the original Zen. I know that would be a candidate.
The Mini-A? I know the guy who whipped that up. He's a nut case. Or reputed to be.
Ahem...

Grey
 
#13
Modest, too. 🙂

Wasn't thinking clearly about the ramification of a 3-wire headphone cable. Somehow I had mentally doubled the number to 6 (3 each channel). My fault.

The Zen-Light would be a cool project, too. No need for one of those big 300W bulbs for a headphone amp.

Erik
 
#14
I think I didn't explain what I want very well.

I'd like a low power amp, to use it for small speakers and headphones. And that will fit in a small case (say 20*20*5cm). Class A is possible without problems with this low power, but I also want a small case, so not a class A amp that produces 30W of heat per channel. And not something that needs a 300VA toroid per channel (like I rode for the JLH)
 
#15
MikeW's Mini-A circuit board is roughly the size of a paperback book, and that's for two channels. Parts count on an original Zen is lower, so a PCB could be smaller, but it's less efficient than the Aleph circuit, so the power supply and heat sinking requirements go up for similar wattage. I've never fiddled with the JLH, but can't imagine that it would be very large. Geoff would be the one to ask about that, he's carved himself a niche as being the answer man about the JLH.

Grey
 
#17
Bricolo said:
I think I didn't explain what I want very well.

I'd like a low power amp, to use it for small speakers and headphones. And that will fit in a small case (say 20*20*5cm). Class A is possible without problems with this low power, but I also want a small case, so not a class A amp that produces 30W of heat per channel. And not something that needs a 300VA toroid per channel (like I rode for the JLH)
Click to expand...


Why discrete?
This is a (high-end) joke I made.
It has OPA548s (SMD😱 ).
Everythig inside my watch box.
I call it "Citizen Amp".😀

Probably THE SMALLEST GC IN THE WORLD.😱
 

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