I have an MXR iso-brick mini power supply mounted under my test pedalboard, usually outputting 9V DC to the pedals up top. However, there is a recessed dip switch on it that changes one of the outputs to 18V. It looks well designed and unlikely to be accidentally 'knocked', but of course... sh*t happens!
So, my PedalPCB Mofeta (Sunn Model T) was one of the pedals connected to the 18V output at the time. It had been working beautifully (I especially love it on bass), but now it no longer passes any sound when engaged, although the LED still lights up. I assume I've fried something, but nothing appears visibly 'blackened' inside. I know there is a charge pump in the circuit (TC1044SPA) that normally increases the 9V up to something higher... could that be the damaged part? Is there a simple way to check before ordering a replacement chip?
Also note that I had added a 100nF capacitor across pins 8 and 3 (ground) of the charge pump, per the suggestion of the original designer of this circuit (the Model feT) - John from Electronic Audio Experiments.
So, my PedalPCB Mofeta (Sunn Model T) was one of the pedals connected to the 18V output at the time. It had been working beautifully (I especially love it on bass), but now it no longer passes any sound when engaged, although the LED still lights up. I assume I've fried something, but nothing appears visibly 'blackened' inside. I know there is a charge pump in the circuit (TC1044SPA) that normally increases the 9V up to something higher... could that be the damaged part? Is there a simple way to check before ordering a replacement chip?
Also note that I had added a 100nF capacitor across pins 8 and 3 (ground) of the charge pump, per the suggestion of the original designer of this circuit (the Model feT) - John from Electronic Audio Experiments.
