This circuit is from a 1969 General Electric manual. The SCR may be the TIC106. Similar circuits from other sources are found on this website.
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....
This 80's circuit makes use of a photomultiplier valve. The circuit also requires a scintillation...
This is the conventional astable configuration of the 555 integrated circuit already explored in...