This flasher for incandescent lamps was found in Radio Electronics magazine from July 1968. The frequency and duration of the pulses are adjusted in R1 and R3 depending also on C1.
The operational amplifier used in this circuit is uncommon today, but the configuration can be...
This power stage with two transistors was found in Radio Electronics magazine from October 1963....
Suitable for operation with high impedance microphones, this circuit was found in American...