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Vidalgo 2nd September 2006 12:43 AM

Mini AD815-based amp module
Here is an unusual design. I always build unusual stuffs.

Designed small AD815-based 2-channel amplification module.
Main job is high-quality headphones driver.
No problem to use it as a preamp output stage.
Also the module can be used as a long cable driver with impedance matching.

Need more info?

Nisbeth 2nd September 2006 07:45 AM

A schematic would be nice :)


Vidalgo 2nd September 2006 10:45 AM

2 Attachment(s)
Here is the schematics

Vidalgo 2nd September 2006 10:55 AM

More pictures.
Sorry for poor photo quality.

neutron7 3rd September 2006 02:11 AM

That is well done board, and the circuit itself

have you checked the DC ofset on it?

Vidalgo 3rd September 2006 02:39 AM

Output offset = offset from the first OPAMP * overall gain (x3).
With OPA132UA, I get typical values about 1-1.5mV.
OPA627 give less than 1mV.
Input was shorted via pot.

neutron7 3rd September 2006 07:11 PM

Thats very good. are you thinking of selling those boards?

Vidalgo 4th September 2006 09:57 AM

Yes, I have spare boards.
Parts or kits available as well.
Or assembled boards.

Vidalgo 13th September 2006 04:12 PM

More pictures.
Here is main powered compact standalone headamp.

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