This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the waveforms of the generated signals. The transistor admits equivalent.
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...
It can be obtained from Mouser Electronics the new 1,500 W RF high power transistor MRF1K50H fro m...
This is the basic operational amplifier configuration for gain 10. R2 can be changed to other...