This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.
The power source shown for powering for small TTL circuits was found on a Radio Electronics...
This circuit serves as a power stage for the CMOS alarms and oscillators given in the previous...
Found in a 1965 General Electric documentation, this circuit uses a zener diode to obtain the...