This unijunction transistor circuit was found in Radio Electronics magazine from July 1968. The circuit operates up to approximately 100 kHz depending on C1.
This voltage inverter circuit is from a Radio Eklectronics from October 1965. It was used in...
Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990....
The circuit presented was found in a 1988 documentation. It consists of an alarm siren that it...