This circuit of a 1964 Electronic Design uses a photodiode from the time. Modern equivalent can be used. The standby current is 1.2 mA.
This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a...
This circuit was found in the October 1993 Electronics Now magazine. The circuit can be used in a...
This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made...