your supply may be capable of 5V, and a gazillion mA
over current wo'nt burn the circuit??
for example this adapter (photo) will be allright to use, BUT we should use a regulator for the voltage (because it's 9-12V) ??
Look at the top right - X1 is barrel connector, D1 is reverse polarity protection diode, U1 is the onboard regulator.
The voltage before the diode should be ~7.5V, the voltage after the diode ~6.5V, and the regulator will output 5V.
i did understood the sketch, well sort of,iv'e couple of questions for that aswell but not now. What's more important is that i still cant understand how should i connect everything, cause u said: "U1 is the onboard regulator" so - i shouldnt add a regulator? and if i should does it matter which 5V regulator (can i use this 7805 Voltage regulator?) ?
does the diode is just optional?