This power supply was found in a RCA publication from the 1970s. The circuit uses transistors from that time. Modern equivalent transistors can be used.
For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The...
This circuit was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...
Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz....