This powerful motor control was found in a Philips publication from 1970. The components are from that time and the circuit was designed for the 220/240 V power grid.
We found this oscillator in a documentation for radio amateurs from the 1970s. The circuit can use...
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...