With this circuit it is possible to modulate pulses from a pulsating input signal. The PNP transistor can be the BC558 and the power must be supplied with 5 V.
July 2016 - It can be obtained from Mouser Electronics new trinkets Adafruit. These trinkets are...
This configuration enables the use of low current switches or sensors to control high power loads...
This 5 V power supply was found in the January 1992 issue of Radio Electronics magazine. The...