Upon pressing the switch, the circuit generates a pulse whose duration depends on C. The transistors can be BC548 and the power can be between 1 and 6 V. The circuit is from a 1975 publication.
This transistorized shield also functions as a logic gate. The power supply can be in the range of 4.5...
You can adjust the frequency produced by a ring oscillator with three inverters inserting a...
This circuit was obtained from old documentation and has a very simple 6 or 12 V configuration...