This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be current equivalents. The circuit has period adjustment and symmetry.
This 1 kHz circuit was found in American documentation from the 90s. The original operational...
This circuit triggers a remote doorbell when the phone rings. The circuit is for the 110 V mains...
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...