Quick question about this wiring diagram.

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by GuitarInnovations, Dec 15, 2019.

  1. GuitarInnovations

    GuitarInnovations Member

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    The hot from the power cord and the black from the power transformer both go to what appears to be the back (ground?) of the volume pot. It says "power switch" where the wires go, but this is confusing. Why don't they go to an actual switch? And if the potentiometer is acting as the switch, why do they appear to be simply soldered to the back of the potentiometer as if they were grounded?

    [​IMG]
     
  2. GuitarInnovations

    GuitarInnovations Member

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    Wait, it appears it's going to a switch, but why is it overlapping the potentiometer?

    Sorry for the dopey questions, I am just learning how to read schematics. Rob's site is an awesome resource.
     
  3. Jeff Gehring

    Jeff Gehring Silver Supporting Member

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    Because the Champ is so small that it doesn’t have a separate power switch; it’s part of the volume pot.

    [​IMG]
     
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  4. GuitarInnovations

    GuitarInnovations Member

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    Thanks for clarifying. I had no idea, but this looks like a good starting place for me to build an amp.
     
  5. HotBluePlates

    HotBluePlates Member

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    Make sure you have some very good instructions. A Champ is a simple circuit, but it's in a very tight space. Things need to be installed in a specific order to fit inside the chassis, and wires routed a certain way so you have clearance to get your soldering iron where it needs to go.
     
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  6. Glitch Magnet

    Glitch Magnet Member

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    Technically, that's not a schematic diagram. It's a component placement and wiring diagram. And not a great one at that, in that the control and connector components don't accurately resemble the actual components. Thus your confusion.

    In this amp, the volume pot has three terminals on the side for audio, and two additional terminals on the back for the integrated power switch.
     

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