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 circuit should be used with low frequency signals only. The circuit is from a documentation from the...
For the low channels (2 to 6) the coil is formed by 5 turns of wire 20 or 22 in a form of 1 cm...
This circuit is from an old French documentation from the 70s. The coupler admits equivalents and...