Alright, so here it is. I e been racking my brain for a few days trying to figure it out, but I just can’t think of a reason for it. Apologies if this has been asked before, but I couldn’t find anything about it.
In the Chasetone Secret Pre circuit and the Catalinbread Epoch Bias circuits, the Clandestine Preamp and Eschaton Preamp respectively on PPCB, the pedals use a voltage multiplying power supply circuit to bump the voltage to around 22volts, but the JFETs are only biased to less than half that. The Clandestine I built is biased at around 7 volts, and the Eschaton has a 22k resistor at the drain, which I just measured, biases to 4.12 volts. It also has a Bias knob that connects to the Source. But, why have the voltage multiplying power supply, if it only uses half or even a quarter of the power that is being made??? Sorry if this is a dumb question, but I can’t see any point in it. Wouldn’t the circuit sound the same with a standard ‘ole 9 volt power supply? I’ll attach the schematics too. Thanks in advance! -Don
In the Chasetone Secret Pre circuit and the Catalinbread Epoch Bias circuits, the Clandestine Preamp and Eschaton Preamp respectively on PPCB, the pedals use a voltage multiplying power supply circuit to bump the voltage to around 22volts, but the JFETs are only biased to less than half that. The Clandestine I built is biased at around 7 volts, and the Eschaton has a 22k resistor at the drain, which I just measured, biases to 4.12 volts. It also has a Bias knob that connects to the Source. But, why have the voltage multiplying power supply, if it only uses half or even a quarter of the power that is being made??? Sorry if this is a dumb question, but I can’t see any point in it. Wouldn’t the circuit sound the same with a standard ‘ole 9 volt power supply? I’ll attach the schematics too. Thanks in advance! -Don
