This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
This voltage regulator circuit has 1 A of maximum current for a TIP32 and 500 mA for a BD136. The...
We found this circuit in an American documentation of the 80's, being indicated for the test of...
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...