Hi, I'm just getting into learning the theory behind electronics instead of just tinkering & I have a question that's probably really simple but I can't work out the answer to myself yet. I have a couple of circuits (simple analog audio circuits) I want to combine into one device that use different power supply voltages, and neither of them take the 9v supply I have readily available right now. I know I could simply use a voltage regulator to supply different voltages to different parts of the circuit but I don't currently have any on hand or much disposable income & I'd like to save space on the board if possible regardless. Is this as simple as applying Ohm's law & using 4 or 3/4 times (circuits run off of 1.5v & 12v supplies respectively) the original resistor values or is it more complicated than that? What about capacitor values? These are simple enough circuits I don't imagine I'd have much trouble from that point playing trial & error with regards to swapping out transistors & such.