This 600 W reducer uses SCRs and a switching system. The circuit is from Motorola's 1975 documentation. Equivalent components can be tested for other powers.
In the figure we have a practical circuit for use with a magnetic transducer. The 20 M ohms...
Based on the well-known LM3909, this LED pulser circuit was found in American documentation from...
This circuit was found in old documentation but uses components that are still common. The circuit...