This circuit was found in General Electric documentation from 1965. The transistors are from that time. The diodes consist of a component that contained them.
The clock circuit shown in the figure is suggested by Murata and is based on a ceramic resonator of the...
The operational amplifier of this configuration from the 70s is the 741 in its Motorola version from...
This circuit was found in the September 1971 Radio Electronics magazine. The buzzer can be...