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25th October 2009, 02:44 PM
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#101 |
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diyAudio Member
Join Date: Aug 2009
Location: indonesia
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i got the schematic,thanks
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18th November 2009, 03:03 PM
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#103 |
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diyAudio Member
Join Date: Mar 2005
Location: Edam, The 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.
__________________
Acception without proper examination equals religion Condemnation without proper examination equals prejudice |
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18th November 2009, 08:48 PM
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#104 |
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diyAudio Member
Join Date: Oct 2006
Location: Belgium the land of chocolate
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It is send
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19th November 2009, 12:00 AM
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#105 |
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diyAudio Member
Join Date: Mar 2005
Location: Edam, The 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.
__________________
Acception without proper examination equals religion Condemnation without proper examination equals prejudice |
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19th November 2009, 10:05 PM
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#106 |
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diyAudio Member
Join Date: Nov 2008
Location: Devon UK
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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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19th November 2009, 10:43 PM
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#107 |
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diyAudio Member
Join Date: Aug 2008
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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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19th November 2009, 11:12 PM
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#108 |
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No snake oil
diyAudio Member
Join Date: Aug 2005
Location: In the middle of 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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/ Anders |
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20th November 2009, 03:22 PM
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#109 |
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diyAudio Member
Join Date: Aug 2008
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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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20th November 2009, 04:24 PM
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#110 |
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No snake oil
diyAudio Member
Join Date: Aug 2005
Location: In the middle of Sweden
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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.
__________________
/ Anders |
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