Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz. Modern equivalent transistors can be used.
Found in documentation from the 1980s, this circuit can be used with other operational ones. The...
This circuit warns you if you forget to turn off the car light and leave it. The circuit is from a...
We find this efficient emergency lighting system in a 1987 publication. The circuit keeps a...