This circuit uses an unusual sensor nowadays, but the configuration can be adapted to more modern types, as well as the operational amplifier. The circuit is from an 80's documentation.
This circuit can be used with 5 to 15 V sources and the zener diode must be chosen according to...
Here we show how a Constant Current Source can be created in the Multisim Blue using a common BJT...
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...