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.
We find this circuit in 1975 documentation. The circuit can be used with other operational...
The circuit shown makes use of a symmetrical 15 V source and an LM3900 transconductance...
This circuit from a 2001 publication converts binary values programmed in 4 keys into hexadecimal values...