Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
This circuit was found in a 1990 Electronics Handbook. The transistors can also be the BC548 and...
This circuit can be used to obtain control signals from an infrared emitting source. The circuit is...
The integrated circuit used in this project is not the most common. The use of a crystal...