Mini AD815-based amp module

[Vidalgo]

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?

An externally hosted image should be here but it was not working when we last tested it.

 

[Nisbeth]

A schematic would be nice


/U.

 

[Vidalgo]

Here is the schematics

 

[Vidalgo]

More pictures.
Sorry for poor photo quality.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[neutron7]

That is well done board, and the circuit itself

have you checked the DC ofset on it?

 

[Vidalgo]

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]

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

 

[Vidalgo]

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

 

[Vidalgo]

More pictures.
Here is main powered compact standalone headamp.
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An externally hosted image should be here but it was not working when we last tested it.

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An externally hosted image should be here but it was not working when we last tested it.

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An externally hosted image should be here but it was not working when we last tested it.

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An externally hosted image should be here but it was not working when we last tested it.

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An externally hosted image should be here but it was not working when we last tested it.

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