This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
This circuit is from an old American documentation using as indicators for the flip-flops neon...
This circuit that uses only discrete components (transistors) mimics the sound of an American...
July 1017 - Maxim MAX17290 and MAX17292 PWM boost controllers can now be purchased from Mouser...