This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The phone is crystal. We found it in a 1968 American documentation.
This 80's National Semiconductor circuit uses an era integrated circuit and symmetrical 5V power...
This circuit was found in old English documentation. It can be improved by using resistors of...
Based on a PLL 567, this circuit serves as a receiver for the CB9574E circuit. S tuning is done in R1...