Tweakers' Asylum

Bypassing gain controll Class D Audio SDS Amp

50.170.160.60

Aaron 01

Does anyone know how to figure out what resistor is needed to bypass the gain control on a Class D Audio SDS amp? I read it somewhere before but I cannot find it now, and unfortunately I can solder but I have no idea how to figure out the value.

Thanks,
Aaron

PS I know I also posted in the amp/preamp section but I wasn't sure where this would be best

Follow Ups:

Why not contact Tom at Class D Audio and ask him? - Dman 09:46:47 03/19/15 (0)
I've talked and emailed him quite a few times during my current amplifier hunt, and he has ALWAYS been accommodating of my questions and concerns...

Cheers,
Dman
Analog Junkie
RE: Bypassing gain controll Class D Audio SDS Amp - Chip647 11:15:33 03/14/15 (1)
It will be no different than just turning the pot all the way up. At that point, the potentiometer is just a resistor to ground. If you really must proceed, turn the pot all the way up and measure the resistance from the RCA input jack to ground. That is your resistor value. It will be somewhere between 25K and 100K. The actual value is not all that critical.
- RE: Bypassing gain controll Class D Audio SDS Amp - Aaron 01 11:30:45 03/14/15 (0)
  What I was talking about was referenced here:
  
  http://www.computeraudiophile.com/f8-general-forum/class-d-audio-sds-254-a-8483/
  
  pots
  
  Yeah, it comes with two pots. They look kind of cheesy but Tom insists they are quite good. I played around with them and settled on a gain of about 27 dB, and put in some Vishay naked 2.2Kohm resistors. Per Tom (please note the wire color coding has changed):
  
  "For those who wish to change the pots for fixed resistors, here are resistor values to produce required gain. Gain is listed in dB: To change gain potentiometer to a fixed resistor, you would connect a fixed resistor between the yellow and black wires on the gain controls (of course, remove the gain pots). Leave the red wire disconnected.
  
  Use high quality 1% resistors: 1/2 watt is sufficient.
  
  560 Ohm = 31 dB
  
  1K = 30 dB
  
  2.2K = 27 dB
  
  5.2K = 23 dB
  
  6.2K = 18 dB
  
  7.5K = 16 dB
  
  I hope this is of some help. Please feel free to post this on the forums if it will help others. On my personal systems here, I use the same pots that come with the kits."
  
  I wasn't sure now that the wire color codes had changed again which ones to jump, and also how to measure the resistance on the pots?

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