This 3 and-a-half digit circuit was found in a Teledyne documentation from the 90s. The circuit uses a thermocouple as a sensor. The integrated circuit used is uncommon today.
January 2017 - Mouser Electronics already has to supply the INA240 evaluation modules for current...
This circuit was found in a Philips documentation from 19678. The transistors are from the period...
The L1 and L2 coils of this receiver depend on the waveband you want to receive. Normally L2 has...