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.
Found in a 1960's Mullard transistor manual, this circuit has an input current of 4.4 A and an...
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
This is the basic configuration of an operational amplifier as a current regulator. We found it in...