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Old 22nd November 2003, 02:35 AM   #11
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Quote:
Originally posted by Solid Snake
I also wanted to do something like you are doing. I wanted to use a digital volume control or maybe one of those digital pots but they are not very linear so I drew this up one day when I was bored in class, tell me if it makes sense.
Good Lord man!! Get yourself a circuit drawing program!!!


As for a simple solution...find someone to sell you a 8 module Clairostat, like this: http://www.potentiometer.com/partdat...03112110113389
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Old 22nd November 2003, 10:44 AM   #12
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MS Paint to the rescue...
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Old 22nd November 2003, 11:25 AM   #13
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That first transistor is there to allow control by voltage, if you're using a pot, you can put it in the transistor's place.
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Old 22nd November 2003, 10:03 PM   #14
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Solid Snake,

Have you tried breadbording this? Any suggested values for the resistor and the transistor?

This is really interesting

BTW, Thanks for sharing.

JojoD
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Old 22nd November 2003, 11:04 PM   #15
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No I haven't tried breadboarding this. It seems that a 470-1K ohm resistor on the input should work okay. For the ATT resistor you may want to try something like 100K, you can play with different values but don't go too low or it may burn up. You can use a 2N2222 and it's complement, since the signal doesn't actually go through the transistor I don't think it matters much. If you try this, let me know how it works for you.
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Old 22nd November 2003, 11:43 PM   #16
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Hi,

I will try to breadboard the circuit when I can. I will inform you of any developments asap.

JojoD
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Old 25th November 2003, 07:39 AM   #17
EDUM is offline EDUM  Netherlands
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Another option not mentioned yet is the use of toothed wheels and connect as many potmeters as you like. This option gives also the possibility to choose different quality potmeters for the main L/R channel and the "effect" channels.

Use toothed wheels with as many teeth as possible for the wheel diameter you can handle. Take care for the reversal of direction by mounting every second potmeter mechanicaly reversed as well.
This "simple" mechanical solution migth even offer a better channel separation. Or is usable for a "passive" upgrade for an existing stereo preamp.

success!

Ward
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Old 25th November 2003, 06:06 PM   #18
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Default Great idea but...

EDUM,

Using gears for controlling several pots has already been in my mind but I am not a "mechanical" person and implementation could be extremely difficult however doable. But still, the idea is very good.

I just had this weird idea!!!!!!

Consider a resistive network (in series) of resistors with one end as the input and the other end connected to ground, with a CD4066 (bilateral switch??) I can select where to tap for the output using dc voltage right? Now isn't that an excellent idea? Maybe a patent?

I sure hope that I can "dream" of a solution in the design tonight.

Good Night,
JojoD
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Old 25th November 2003, 06:34 PM   #19
subwo1 is offline subwo1  United States
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This modification of the earlier circuit may work better because it isolates each of the six circuits more from the poteniometer.
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