This TTL heads or tails circuit was found in the July 1973 Radio Electronics magazine. The LEDs are types of the time. Note the symbolic representation of this component.
This VHF transmitter was found in Radio Electronics magazine from June 1964. The transistor is an...
This two-transistor circuit is from a Radio Electronics magazine from April 1965. The transistors are...
This circuit was found in a 1967 documentation. The switch diode is a component of the time and is...