Why jump pins on a pot?

Discussion in 'General Electronics Chat' started by GRNDPNDR, Mar 25, 2014.

  1. GRNDPNDR

    Thread Starter Member

    Mar 1, 2012
    435
    7
    Just a random question that popped into my head while looking at a schematic yesterday.

    I notice a lot of times pins 1 and 2 on a pot are tied together , like in a 555 circuit.

    What is the reason for this? why not just use the wiper and the pin that's needed?

    is it a failsafe thing, so if the wiper failed the circuit would still run?
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,800
    1,103
    Usually. Wiper contact can go intermittent.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    I agree. It reduces the impact of the wiper going open occasionally. Resistance jumps to the nominal ohms of the VR instead of infinity. It's good form. Not always necessary but never (?) the wrong thing to do.
     
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