The integrated circuit used in this configuration for noise reduction on FM radios is not common today. The circuit is from 80s documentation and the reduction rate obtained is in the 10dB order.
This circuit is recommended for alarm systems since it has a good output stage. The circuit is...
) Suggested by Philips in a 1968 documentation this circuit has very high 10 ohm on-load voltage...
No information is given about the transformers in this circuit suggested by Motorola in a 1968...