This simple circuit found in a 1968 EEE was intended for data transmission over the telephone line. The components are from that time, some are uncommon today.
The transistor of this circuit found in an old American documentation can be the BC548 for T1 and...
This circuit was found in Motorola documentation from 1969. The transistors are from that time. The...
The crystal in this circuit can have frequencies from 100kHz to 8MHz. Capacitor C2 adjusts the...