This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on the XR2206, which is not a component found easily today.
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...