The indicator for this circuit is a 0 to 1 mA milliammeter. The operational is from the 70s, when the circuit was published. Modern equivalent can be used.
We found this circuit in the 1974 Ferranti transistor manual. Transistors are from the time, being...
This circuit includes a power stage with an integrated circuit that is uncommon today. Equivalents can be...
With this circuit, a common multimeter can be used to check if there is a microwave leak in a...