This circuit was obtained from an 80's Radio Electronics. The circuit decodes “scrambled” or sinusoidal encoded signals by providing an audio signal at the output.
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
This circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit uses...
This modulated siren has frequency adjustment and modulation in the trimpots. For 220V use 1N4007 as...