This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very common today. The power supply must be symmetrical.
This circuit obtained in a 1965 magazine indicates when all signal from a transmitter is going to the...
This common circuit with two transistors was found in an old French publication. The supply can be...
This symmetrical power supply uses only one zener diode in its regulation, supplying voltages of...