We found this circuit in a Japanese 1968’s documentation. The circuit makes use of transistors from that country common at the time of publication. Observe the symmetrical power supply for the circuit.
This circuit was found in an 80's Radio Electronics. The circuit multiplies the frequency of a low...
This Motorola circuit, found in old documentation, keeps the voltage applied to a load by a triac...
This circuit was found in an Argentine Radio Escuela Gráfica magazine published in the 1970s. The...