This flasher for incandescent lamps was found in Radio Electronics magazine from July 1968. The frequency and duration of the pulses are adjusted in R1 and R3 depending also on C1.
This circuit was found in the December 1957 Radio Electronics magazine in the patent section. It...
This power supply for tube heaters was found in a January 1961 Radio Electronics. The circuit uses...
This configuration with FET and Unijunction can be found elsewhere on this site. The JFET admits...