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.
This circuit was found in an old European documentation. When R2 is cut off the circuit triggers...
This 45 to 90 Hz hum elimination circuit was obtained from a 1980s documentation. The operational can...
This circuit was found in a 1989 documentation and was intended to be part of a presence...