This circuit is from a 1967 documentation. It consists of a sensor for memories used at the time. It can be made with modern equivalent transistors. Note the 4 V symmetrical power source.
This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according...
This circuit makes an incandescent lamp blink in order to vary its brightness with a candle...
This configuration was found in a 1970s American magazine. The circuit uses both CMOS logic and...