Swapping a resistor for a potentiometer

Started by foureyes, September 30, 2019, 10:40:35 PM

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foureyes

I have a small three leg potentiometer that I want to put in a fuzz circuit to bias a Germainium transistor.

I have only built two pedal circuits so far and am learning. I thought I remembered reading somewhere that i needed to connect the middle leg to the third leg and then solder it into the place of the resistor. (Noob question... bear with me...)
Is this correct? ???

Thanks so much for your help!
Mike

antonis

Welcome 4eyes..!!

Basically yes, you're right..

In more details, it depends on specific job you want to do your pot (which is wired as variabale resistor)..
(e.g. if you wish to raise resistance clockwise, short wiper with lug3 - if you wish the reverse effect, short wiper with lug1)

Can't figure your circuit but if pot is to replace Emitter resistor you should wire it with wiper shorted to lug1 (GND or voltage lower than on lug3) for clockwise raising gain..
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

GibsonGM

Welcome Mike! 

Yes, what Antonis said.  When I first was starting out, I would get an old pot and with a couple of jumper wires, use my meter to convince myself of which terminal did what.   With a probe on the middle (wiper) and one of the outer lugs, I would turn it to one side or the other, and watch my meter (set to "ohms", omega symbol).     This is the variable resistor connection.
   
Once you have mastered that connection style, you can move on to 'voltage divider' connection of a pot, which uses all 3 terminals! 

~Mike
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foureyes

Thank you both for your help! I hadn't had time to get back to my computer since posting. I'm going to give it a shot tonight.

;D

GibsonGM

I gave you your first "like" because you are "going to give it a shot tonight", which shows initiative, ha ha!   

Hope it is going well.  Tell us how you made out.
  • SUPPORTER
MXR Dist +, TS9/808, Easyvibe, Big Muff Pi, Blues Breaker, Guv'nor.  MOSFace, MOS Boost,  BJT boosts - LPB-2, buffers, Phuncgnosis, FF, Orange Sunshine & others, Bazz Fuss, Tonemender, Little Gem, Orange Squeezer, Ruby Tuby, filters, octaves, trems...

antonis

I also gave you your 680th like for giving 4eyes his first like, Sir..!!!  :icon_biggrin:
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..