Found in Popular Electronics from the 90s, this circuit detects modulated infrared radiation and serves as a test for remote controls. Infrared sensors equivalent to the one indicated can be used.
We find this circuit in an American 80's documentation. No further information about the...
This circuit was found in a 1980s documentation. The operational amplifier is of a common type at the...
We found this adapter in a 1970s American documentation on instrumentation. It is suitable for analog...