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Old 2nd September 2006, 12:43 AM   #1
Vidalgo is offline Vidalgo  Israel
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Default 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?

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Old 2nd September 2006, 07:45 AM   #2
Nisbeth is offline Nisbeth  Denmark
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A schematic would be nice


/U.
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Old 2nd September 2006, 10:45 AM   #3
Vidalgo is offline Vidalgo  Israel
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Here is the schematics
Attached Files
File Type: pdf am-1_rev-b_sch.pdf (21.1 KB, 322 views)
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Old 2nd September 2006, 10:55 AM   #4
Vidalgo is offline Vidalgo  Israel
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More pictures.
Sorry for poor photo quality.

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Old 3rd September 2006, 02:11 AM   #5
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That is well done board, and the circuit itself

have you checked the DC ofset on it?
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Old 3rd September 2006, 02:39 AM   #6
Vidalgo is offline Vidalgo  Israel
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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.
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Old 3rd September 2006, 07:11 PM   #7
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Thats very good. are you thinking of selling those boards?
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Old 4th September 2006, 09:57 AM   #8
Vidalgo is offline Vidalgo  Israel
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Yes, I have spare boards.
Parts or kits available as well.
Or assembled boards.
.
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Old 13th September 2006, 04:12 PM   #9
Vidalgo is offline Vidalgo  Israel
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More pictures.
Here is main powered compact standalone headamp.
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