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 circuit is from a 1998 Poptronics. The circuit triggers a buzzer after a certain time, waking...
This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to...
We found this circuit in the Audio Handbook of the National Semiconductor of 1977. The circuit leaves...