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Old 25th October 2009, 02:44 PM   #101
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i got the schematic,thanks
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Old 4th November 2009, 09:18 AM   #102
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hi,

Can you please send me the Schematic of the A500.

please send it to coolwater4748(at)hotmail.com

Thank you very much.

kind regards
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Old 18th November 2009, 03:03 PM   #103
SSassen is offline SSassen  Netherlands
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I'd be very interested in the Behringer A500 schematics, if any of you fine gentlemen can be bothered to send it over to the below listed email address it would be very much appreciated!

ssassen-at-hardwareanalysis-dot-com

Cheers,

Sander.
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Old 18th November 2009, 08:48 PM   #104
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It is send
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Old 19th November 2009, 12:00 AM   #105
SSassen is offline SSassen  Netherlands
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Got the schematics, thanks very much! Strange topology on the Behringer A500, I was expecting a classic Miller approach, maybe with a folded cascode or some other refinements, but this is dissapointing.

Cheers,

Sander.
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Old 19th November 2009, 10:05 PM   #106
Xoc1 is offline Xoc1  United Kingdom
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On Youtube there is a video that shows increased distortion using the A500 volume control at 60-70%
YouTube - ebaystars's Channel
I thought this might be of interest to A500 users out there!
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Old 19th November 2009, 10:43 PM   #107
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this is NOT volume control, it is Gain control.
Stupid design, only sick mind can do things like this. Changing input resistor of inverting opamp to control gain...this is crazy. Whole input section should be redesigned
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Old 19th November 2009, 11:12 PM   #108
AKN is online now AKN  Sweden
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Hi Stormsonic,

What do you mean by "gain control"?
You don't control the gain in any active circuitry. Feedback goes to OP-amp non inverting input.
Or have I misunderstood your post entirely?
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Old 20th November 2009, 03:22 PM   #109
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yes, this is crazy design. With potentiometer you change the gain of inverting opamp, not attenuating input signal. Resistors R66 and R67 are not there on real PCB (empty pads). They exist only on shematic
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Old 20th November 2009, 04:24 PM   #110
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Hi,

According to the schematic you don't alter op-amp gain by turning the pot, its just an attenuation.

The feedback loop enters the op-amp non inverting input. This is because the speaker output is already inverted relative op-amp output. Inverting twice would result in positive feedback not negative.

Think very different with this amp.
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