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Peavey Nashville 212 power supply question.

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  • Peavey Nashville 212 power supply question.

    Hello, this is my first time posting, so please be kind I have a Peavey Nashville 212 and have a question about the +-15 power supply circuit. What is the purpose of R54 (700 ohm 5 watt) on the input of the positive 15 regulator (U6)? Why only on the positive regulator and not the negative regulator? I'll try and upload the schematic. Thanks
    Attached Files

  • #2
    This resistor was installed later, when debugging the circuit,
    when the device whistled when turned off. That is why it has such a position index - R54.
    Capacitors at the input of on-chip stabilizers are rather large in nominal value.
    And not only the amplifier chips are powered from +15 V, but also the control switch on U6. Here it is de-energized earlier by a sharp discharge of the capacitor at the input of 7815.
    Also, a quick disconnect of 7815 disables Q7 on input U3, putting the latter in MUTE mode​
    Last edited by x-pro; 03-12-2024, 10:01 PM.

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    • #3
      Well thank you X-Pro for that tidbit.

      Comment


      • #4
        Thank you X-Pro for the explanation, it was driving me nuts. I appreciate the reply.

        Comment

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