Spot on :-)
i dont think i will bother with the bigger caps.
1. too power hungry.
2. too big.
3. dont want to go overkill.
i am going to try the 220uf caps tho, just to experiment.
i have changed the sterio pcb socket in my basket for a panel mount one.
total cost per cmoy so far:
components from rapid:£4.20
not too bad :)
Well, if you are using the OPA2132:
you can see that it will tolerate up to a +/- 18v supply. That means you could use x4 9-volt cells to power it. They run well at most voltages, but I would use x2 nine volt batteries in order to achieve a +/- 9 supply. The battery life isn't really affected but they will most likely distort less at higher voltages.
Its better to be safe and use 25v caps if you have room, then if one fails and all the voltage goes through one of them, you won't have to pick pieces of capacitor electrolyte out of your eyes. And trust me, they CAN explode! One of my coworkers almost got a tantalum cap to the face when it blew up after receiving 8 volts more than its rating. It was like the Fourth of July.
So its better to play it safe and use caps that could handle a short in your power supply, just in case.