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 alarm circuit was found in a 1982 publication. It uses components that can still be found...
We found this micro amplifier in a technical documentation from National Semiconductor. The...
This circuit simulates the call tone of a telephone. The transducer is a high impedance capsule, and...