We found this traditional flasher configuration in a June 1969 Radio Electronics magazine. SCRs are controlled by the power of the lamp.
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operative. However,...