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.
I found this circuit in an English publication from 1989. This configuration can be mounted with...
This circuit can be used to amplify signals up to 150MHz. The JFET can be MPF102 or BF245 and the...
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...