This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
This circuit was found in an English publication from the 80's. It triggers a buzzer (with...
This circuit can generate signals in the audio range between fraction of hertz up to approximately 10 kHz...
This 9 + 9 V symmetrical power supply was obtained in a 1977 symmetric publication but can still be...