Solar receiver (CB20487E)

This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the time. The circuit is from 1991.

BCP56H Medium Power NPN Transistors 80 V 1 A
May 2017 - Mouser Electronics is already in stock with the new BCP1395 transistors from Nexperia....
Freezing Sensor (CB6048E)
This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation...
Gain 100 operational L161 (CB4909E)
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...