This signal injector and tracer (follower) was found in an old American documentation. The transistors can be general use and power is made with one or two common cells.
This circuit using a SIDAC is suggested by ON Semiconductor in its thyristor manual. The circuit...
August 2017 - Mouser Electronics announced the availability of a full range of Mean Well regulated DC-DC...
In this circuit from the 60s, the power supply is made with 22.5 V, which is the voltage of the...