This circuit for communications receivers was found in the January 1974 issue of Radio Electronics magazine. The transistors are Japanese types of the time, as the circuit was part of equipment of that origin.
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...
This circuit using an operational amplifier was found in old American documentation. It can be...
The relationship of values between R1 and R2 determines the reference voltage for this circuit that...