This circuit was found in a 90s Popular Electronics. The circuit uses components from that time, intended to receive signals in the range of 150 to 250 kHz.
September 2017 - Arduino Lucky Shield shields containing a 5 V OMRON-g6RL relay, a Everylight...
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...