Found in Motorola documentation from the 1970s, the circuit presented uses a component from the era that is not common today. The characteristics of the coils are given next to the diagram.
This ultra-simple circuit need a carbon microphone to operate. The circuit must be powered from D...
May 2016 - It can be obtained from Mouser Electronics new tricolors chipsLEDs from Broadcom for...
This circuit has a sensitivity of 200 mV providing an RMS power of around 4 W for a load of 8 ohms...