Antique VOM Power supply?

Discussion in 'The Projects Forum' started by Axel23, Oct 29, 2013.

  1. Axel23

    Thread Starter New Member

    Mar 27, 2010
    Looking to build a power supply for this old VOM meter I was gifted.
    It is a Triplett VOM Model 801, Type 1.
    I havent been able to locate any schemo's or manuals for this yet.
    It has 3- 9v batteries and an 1.5V battery.
    I would like to be able to save this design for portability/genuineness.
    But would like to build an optional wall wart option.
    Anyone have any pointers to get me started?
  2. wayneh


    Sep 9, 2010
    Those 9V are in series? I haven't seen wall warts go that high in voltage but I wonder if a laptop power brick - typically ~20V - wouldn't work just fine. Or use the +12 and -12 of a computer PSU to give you 24V.
  3. Axel23

    Thread Starter New Member

    Mar 27, 2010
    Havent got ahold of a schemo yet, dunno if those 9V are in series or not.
    I was told by a senior tech that the 27v supply is for high OHM readings.
    That the 1.5V is suitable for most readings now-a-days.
    Hopefully, someone with more knowledge can verify this.
    I cant imagine just hooking up a 1.5 regulated supply(1A) would suffice for this?
    Also, I dont know what scale I should be working with on this supply.
  4. MrChips


    Oct 2, 2009
    Remember, the only reason for the batteries is when you want to measure OHMS.

    For just measuring VOLTS or AMPS you don't need the batteries.