This circuit turns off after a time given by capacitor C1. This component can have from 1 to 1,000 uF depending on the desired time. The circuit is from an Electronics Now from June 1995.
We found this complementary simetry configuration in a1980s documentation. Transistors, which are...
Found in a 1968 Motorola documentation, this circuit operates at 1 kHz and can deliver 20 V from...
This circuit was found in an English magazine from 1976. The transistors can be the BC548. The...