Obtained from an English publication in the 1980s, when a weather station operated in that country at 60 kHz, this circuit employed only two general-purpose transistors.
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....
This circuit, in addition to providing an output that corresponds to the absolute value of the...
This circuit works with the previous two by demodulating the signals received modulated in FM. The...