The main feature of this circuit found in an old American publication is that it is powered by the very signal it converts. The transistors are of the time and can be replaced by current types.
The 4093 or any other NAND gate can be used for the very sensitive configuration of a R-S...
This circuit was obtained from Radio Electronics magazine of June 1964. The SCR may be a modern...
This circuit causes an LED to flash if the monitored voltage exceeds the value set in the pot. The...