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Old 6th September 2002, 10:35 PM   #21
jag is offline jag  United States
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So it should be like this?
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Old 6th September 2002, 10:42 PM   #22
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Yes.

I think it's better to do it after 221 resistors. Also 100k is too much for the output. Both this resistor's value and 5k to ground should be carefully chosen for best operation.

Any advice Mr. Pass?
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Old 7th September 2002, 03:24 AM   #23
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Alps does have a supposedly very high-quality quad potentiometer but costs about $200-250.
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Old 7th September 2002, 04:32 AM   #24
jag is offline jag  United States
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Quote:
Peter:

I think it's better to do it after 221 resistors.

That will essentially put the pot in parallel with the load (speaker). Well, I guess you can control volume that way, but wouldn't that imply that the pot will need to dissipate a lot of power
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Old 7th September 2002, 05:12 AM   #25
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take a look at lohk's pics:

Passive Preamp

If your worried about the pot dissipating to much heat simply put some resistors in series with the pot then take the output from in between the resistors and the pot.
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Old 7th September 2002, 02:41 PM   #26
jag is offline jag  United States
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Quote:
That will essentially put the pot in parallel with the load (speaker).
Stupid, stupid me! We are talking about the pre-amp here. Nevermind...
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Old 7th September 2002, 02:41 PM   #27
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I've had same problem, finding a quadruple pot for BOSOZ.
Resolved with a bit of mechanics, as shown. Pots are Alps Blue,
I was a bit worried of channel levels mismatch using two separate pots... but no, nothing at all... very good quality pots.

Roberto Amato
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Old 7th September 2002, 02:47 PM   #28
skaara is offline skaara  Slovenia
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nice
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Old 7th September 2002, 02:57 PM   #29
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Roberto,

This is very nice. I was thinking about it too, but couldn't find suitable parts.
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Old 7th September 2002, 02:59 PM   #30
fcel is offline fcel  United States
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Default Gear Specs

Roberto,
I find your solution very interesting and I think it probably cost less than $10 but it does require some work. Could you provide some specs on the 3 gears? Spacing between the 3 gears, # of tooth per gear and may be a drawing showing the dimensions? If I were to go to a R/C hobby shop, what should I ask for? Thanks.
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