Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an old tape recorder. It can be adapted for other purposes.
This two-transistor circuit is from a Radio Electronics magazine from April 1965. The transistors are...
This 2 meter (144 MHz) preamplifier is intended for use with portable transceivers. The...
This circuit is of great use today, when solar energy is becoming increasingly important. The...