I am pretty much new with this adapter thing. I bought an adapter today with a 9 V rechargable battery. I tried my multimeter between the output and found something interesting. The output voltage is 5 volts on the 9V port. But when I am connecting the battery and turning the adapter on the...
So I'm building a project on a PCB-board, and I'm trying to find a replacement for 9v battery that create +-18v.
I'm trying to power a few NE5532 IC-ciruits, so +-15v would be fine. The 9v battery is just a cheap way to get the power, and i rather not use 9v battery.
So I'm trying to power it...