This circuit works with the previous two by demodulating the signals received modulated in FM. The circuit is from the Radio Electronics magazine of December 1992.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This configuration with complementary transistors causes an LED to flash at a frequency that is...
This circuit was found in a 1968 documentation. It makes use of both NO and NC reed-switches and small...