Quote Originally Posted by Luciano View Post
Hi Magu,

For the next test you will need a signal generator.
(5V square wave of about 1.5 Hz).

If you don't have a signal generator, build this circuit:

(Click to enlarge the picture).

Let me know when you have the square wave signal ready.

Best regards,

Luciano

ok Luciano, i build the circuit. The led Blinks. NEXT? (What do i have to test with this circuit?)