RE: Without the grounded tap

Posted by Tre' (P) on April 17, 2025 at 18:46:37

In Reply to: Without the grounded tap posted by Ralph on April 17, 2025 at 14:15:05:

"The level of the channel that is not being turned down does not change."

That's some pretty good magic!

A voltage divider with 250k as the series resistor and 500k as the shunt resistor will have 2/3 of the input voltage at the output. A voltage divider with 250k as the series resistor and 750k as the shunt resistor will have 3/4 of the input voltage at the output.

If the voltage at the output of the voltage divider is not changing as you change the shunt resistor value from 500k to 750k, then the voltage at the input of the voltage divider must somehow be changing.

Or it's just magic!

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Follow Ups Full Thread

Topic - Scott 299B balance potentiometer question - JRMA 18:53:02 04/08/25 (17)

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)

RE: Scott 299B balance potentiometer question - JKT 20:39:34 04/08/25 (0)

Follow Ups

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: Without the grounded tap

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