M15MK1 : Big POP when I switch the channel or the FAT switch

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    • M15MK1 : Big POP when I switch the channel or the FAT switch

      Hi ,
      I have just finished to build the M15MK1 amp without the footswitch option.
      Everything seems to work fine but I have a big POP when I use the FAT switch or when I change the channel with the switch.
      Do you have an idea how to kill this POP please or maybe I have made a mistake on wiring?
    • New

      Hi and welcome to the forum,
      there should be no loud pop when switching (presuming we have the same understanding of "loud"). Did you measure all voltages and are they OK? Do you measure any DC at the center taps of VR7 or VR2? There should be not much more than 0.9V DC at pin 8 of V1a.
      Regards,
      Martin
      ========== MAD = Martin Adams / Digital ist nicht alles / madamp.de ==========
      ========= Meine Alben: musikding.rocks/index.php/AlbumList/6475/ ========
    • New

      Hi, thank you.
      yes I have 0.9V on pin 8 of V1a.
      I have read some threads on this kind of problem and it seems to occur when a capacitor has one pin with no voltage when the switch is triggered.
      So I wonder if I can add a resistor with high value (1MOhm) at the pin connected to the switch of C14 ? Will it change the sound or have a impact on VR7 or VR2 ? More oven I wonder if I could connect a resistor (1Mohm) between the ground and the pin not connected of C2 ?