This blinker for LEDs up to 500 mA was found in General Electric documentation from 1970. Transistors can be replaced with current equivalent types.
In the absence of a modulation signal, the carrier of this simple short-range transmitter is cut...
Found in a 1969 documentation on neon lamps, it actually takes advantage of the durability of the neon...
This circuit was found in an old Philips publication. The circuit supplies a voltage corresponding to 4.5 V...