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In Reply to: Scott 299B balance potentiometer question posted by JRMA on April 8, 2025 at 18:53:02:
The 220K resistor to which its connected in each channel is why it works.
You only need a regular linear taper 500K pot for this. The wiper is grounded. No idea what the schematic is trying to depict, but any additional tap would be useless. Its a good idea to ground the body of the control though, which might be what that fuzzy schematic is trying to say.
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Follow Ups
- This is a shunt-style balanced control. - Ralph 08:18:33 04/09/25 (15)
- RE: This is a shunt-style balanced control. - Tre' 16:13:19 04/15/25 (13)
- Do you mean the wiper? - Ralph 10:02:43 04/16/25 (12)
- RE: Do you mean the wiper? - Tre' 17:07:35 04/16/25 (11)
- FWIW if you just have a grounded wiper it works exactly the same. - Ralph 08:15:36 04/17/25 (10)
- No it doesn't - Tre' 09:48:01 04/17/25 (9)
- Recommend you try it :) nt - Ralph 14:00:30 04/17/25 (8)
- I don't use a balance control but I can see that it would work. Just differently. - Tre' 14:04:18 04/17/25 (7)
- Without the grounded tap - Ralph 14:15:05 04/17/25 (6)
- RE: Without the grounded tap - Tre' 18:46:37 04/17/25 (5)
- Again, you should try it. nt - Ralph 11:56:06 04/18/25 (4)
- OK. I did. - Tre' 13:25:34 04/18/25 (2)
- You didn't include the load of the input of the next stage - Ralph 14:27:58 04/18/25 (1)
- There isn't one. - Tre' 15:49:31 04/18/25 (0)
- OK. I will. nt - Tre' 12:51:17 04/18/25 (0)
- RE: This is a shunt-style balanced control. - JRMA 15:20:48 04/14/25 (0)
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