Found in old American documentation, this receiver receives modulated infrared signals and converts them into sound. The audio amplifier circuit can be replaced by a modern equivalent.
This circuit with 5 times gain was found in European documentation from the 1980s. The input and...
Suggested by Siliconix documentation from the 90's, this circuit uses power MOSFETs according to the...
Other operational amplifiers can be used on this unit gain amplifier. The circuit is from the 1993...