This circuit is from the 1990 Motorola Linear Databook, which can be developed with more modern equivalent operating systems. The 1 uF capacitor should be of good quality polyester with small leaks
Random pulses are produced by this multiple oscillator using unijuncion Transistors. The...
Two alternating are produced by this circuit. The output signal must be applied to a power stage...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...