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Old 19th November 2002, 03:51 AM   #11
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One could use it like that: fixed resistor to ground and switched series element. Since only one resistor is always connected, purists don't have much to complain and it can be used for up to seven independent channels. Also, no signal volume shoots up to maximum every time you rotate the switch, because shunt resistor is connected permanetly.
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Old 19th November 2002, 04:16 AM   #12
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Quote:
Originally posted by Peter Daniel
One could use it like that: fixed resistor to ground and switched series element. Since only one resistor is always connected, purists don't have much to complain and it can be used for up to seven independent channels. Also, no signal volume shoots up to maximum every time you rotate the switch, because shunt resistor is connected permanetly.
Wouldn't that limit the range of your volume control, and if not, wouldn't it still get damn loud when it has no connection when switching? That is what I was thinking of earlier when I posted, but I don't see how it would work well?

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Old 19th November 2002, 04:31 AM   #13
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I don't think it would limit the range any more than fixed series element and switched shunt resistor (this is what I'm using currently). If no conection when switching, there is no signal at all because of an open circuit.
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Old 19th November 2002, 01:54 PM   #14
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Hi,

Quote:
One could use it like that: fixed resistor to ground and switched series element. Since only one resistor is always connected, purists don't have much to complain and it can be used for up to seven independent channels. Also, no signal volume shoots up to maximum every time you rotate the switch, because shunt resistor is connected permanetly.
And this is exactly how I build these for attenuating the signal in a tube preamp.
When the next stage uses a fixed gridresistor to bias that tube it is important not to shunt it since that would change the tubes' operating point.

Since you put only one resistor and one contact in series with the signal it is also the most "purist" approach.

See also:

Ladder attenuator: Where to solder resistors

Ciao,
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Old 19th November 2002, 02:07 PM   #15
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One other thing; it may seem that 20 positions might not be enough, but I'm using 24 positions Elma and in fact, I'm mostly switching between 6 positions anyway.
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Old 19th November 2002, 02:15 PM   #16
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Hello,

Quote:
I'm mostly switching between 6 positions anyway.
Yep.
And that is where I spend money on resistors.

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