Through the TTL output this circuit can be used as a shield. The sensor is a platinum probe, and the operational amplifier can be replaced by a modern equivalent, preferably of low voltage.
We found this circuit for an anti-theft radar that operates at 400 MHz in a Radio Electronics from...
In the figure we have a diagram of a thermostat using an NTC and an operational amplifier 741. The...
This version of a call-fish is from 1981 using, for this reason, a 90 V battery that is no longer...