This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in old documentation. Operational equivalents can be used.
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...
This filter, which uses an operational 741, passes the frequency band from 500 Hz to 1 500 Hz,...
This circuit is from a 60's documentation. The circuit uses components from the era and serves to...