We found this circuit in the June 1987 issue of Radio Electronics magazine. With it, it is possible to receive signals from the bands determined by the crystals in a common medium wave receiver.
This circuit is suggested by Texas Instruments and can be used on an assembly line to drive an...
In the figure we have a interfacing circuit of TTL logic as CMOS logic using a 6N139 optical...
This alarm with sensors in series and parallel was found in the 1995 Encyclopedia of Electronic...