Found in American documentation from the 1990s, this circuit receives modulated infrared signals. The baud rate depends on the operative used. The main application is like audio link.
This VCO with a common operational amplifier was found in an old American documentation. The...
This circuit of a Popular Electronics from the 80's selects tones around 60 Hz, acting as a filter...
This circuit can be used as a receiver for the CIR10534 transmitter or others described in this...