This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
This circuit activates an incandescent lamp at dusk and goes out at dawn. The sensor is an LDR and...
This circuit that simulates the sound of a drum is part of an article published in the Radio...
This version of the Pierce oscillator with the 2N3904 was found in the January 1994 issue of...