Mini AD815-based amp module

Vidalgo · 2nd September 2006, 12:43 AM

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

/U.

Vidalgo · 2nd September 2006, 10:45 AM

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.
.

.

2nd September 2006, 12:43 AM	#1
Vidalgo diyAudio Member Join Date: Jun 2004 Location: Jerusalem	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?

13th September 2006, 04:12 PM	#9
Vidalgo diyAudio Member Join Date: Jun 2004 Location: Jerusalem	More pictures. Here is main powered compact standalone headamp. . . . . . .

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2nd September 2006, 07:45 AM	#2
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	A schematic would be nice /U.

2nd September 2006, 10:55 AM	#4
Vidalgo diyAudio Member Join Date: Jun 2004 Location: Jerusalem	More pictures. Sorry for poor photo quality.

3rd September 2006, 02:11 AM	#5
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	That is well done board, and the circuit itself have you checked the DC ofset on it?

3rd September 2006, 02:39 AM	#6
Vidalgo diyAudio Member Join Date: Jun 2004 Location: Jerusalem	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.

3rd September 2006, 07:11 PM	#7
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Thats very good. are you thinking of selling those boards?

4th September 2006, 09:57 AM	#8
Vidalgo diyAudio Member Join Date: Jun 2004 Location: Jerusalem	Yes, I have spare boards. Parts or kits available as well. Or assembled boards. .

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