This 4-transistor amplifier can work from 4.5 or 6 V power supplies. We found it in a Mullard transistors manual from 1960. The transistors are from the time.
This circuit turns off after a time that depends on C1. The circuit is from an Electronics Now...
This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July...
Dynamic analyzer is another name given to a signal follower or signal chaser. This circuit is from...