The difference between this circuit and the previous one is that it uses PNP transistors. The circuit is from Radio Electronics magazine from July 1968. The frequency depends on R1 and C1.
When the equipment powered by the SO1 socket is turned on, the SO2 socket is automatically...
This microcircuit that fits in an aspirin box was published in Radio Electronics magazine in...
This circuit was found in an American publication from the 50's. The transistors are made of...