This circuit without sensors in series triggering an SCR was found in volume 5 of the 1995 Encyclopedia of Electronic Circuits. The circuit can have the number of sensors changed.
This high impedance and low capacitance buffer employs a junction FET that can be BF245 or...
This circuit was found in an American documentation from 1966. The transistors are from that time...
This circuit for the 85 to 95 MHz band has a gain of 15 dB. We find it in a 1980s documentation. The...