Found in a 90s American documentation, this circuit can be used as a shield, just change the coupler for one that uses a phototransistor.
This simple detector uses a coil consisting of 150 turns of 30 or 32 wire on a ferrite rod as a...
This circuit is used to convert audio signals from na amplifier into infrared modulated signals....
This circuit is intended for signal amplification of electronic musical instruments. We found in a...