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Old 13th January 2005, 05:30 PM   #1
Stabist is offline Stabist  Slovenia
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Default fake Alps with 4 legs - how to connect it

Hi!

Got one of those fake Alps with resistors inside and 4 legs - I would really be very grateful if someone can give me a tip how to use it correctly - I mean the "layout" for the pins! I've tryied few different versions - but none of them was OK! The closest one was when I mixed up IN and GND (I guess) - so it was the opposite way of turning - and there was some difference between 2 chosen positions (one did act as some how loudness effect) ... But after rewiring that - nothing?!?!?!? Now one position is even "dead"?????

Which pin is ussualy "doubled" in such pots? IN, OUT or GND??


I mean - I use it in a pure passive preamp - does that mean I can't make it into the "loudness" effect? I mean - will I gain anything with switching between two positions??

THANKS!
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Old 13th January 2005, 05:58 PM   #2
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Ground is shared between input and output.
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Old 13th January 2005, 06:36 PM   #3
Stabist is offline Stabist  Slovenia
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Hi!

Thanks - yes - I also guessed that this additional pin must be some kind of quasi ground - because at the min position - there is some resistance between out and it - than it falls and reaches 0 - and from there on it raises - so after some steps it becomes ordinary pot - BUT - hot to wire it now? I mean - my latest wiring is such that I have a toggle switch with which I choose "real" GND or this quasi one - BUT - at 1st position everything works as it should - at 2nd - NOTHING! ???? No sound, just hum!?!?!
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Old 13th January 2005, 08:55 PM   #4
markp is offline markp  United States
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The 4th pin is most likely a 40% tap used in some tone control circuits.
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Old 13th January 2005, 10:15 PM   #5
Stabist is offline Stabist  Slovenia
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Quote:
Originally posted by markp
The 4th pin is most likely a 40% tap used in some tone control circuits.

And that in praxis with mine passive preamp means?
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Old 13th January 2005, 10:19 PM   #6
markp is offline markp  United States
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Quote:
Originally posted by Stabist



And that in praxis with mine passive preamp means?
just dont hook anything to it and it will be fine. It works as a normal pot too.
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Old 13th January 2005, 10:41 PM   #7
Stabist is offline Stabist  Slovenia
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I've already installed toggle switch in to the frotn plate

Altoughg - as said - when IN and GND were connected in the opposite way - it actually worked OK in both positions - only the turning direction from min--max was wrong ...
I just don't understand how come now it doesn work at all ??!!
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