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.
In fact, this 1992 circuit consists of a demonstration circuit of a 5-channel remote control that...
This circuit is from a French book from 1981. The components used are common and the indicator...
When approached by a circuit that operates with RF signals, this circuit captures them by...