We found this circuit in a Linear Technology documentation from the 80's. It has a demodulator, being suitable for links and remote controls. Note the unusual type of detector configuration.
This circuit switches on an external load after a certain interval given by the capacitor. The...
This version of the previous circuit uses a common transistor Hartley oscillator for modulation. We found...
This circuit was obtained from an English publication in 1979 but can be easily assembled with...