Suggested by Raytheon in 1967 documentation this circuit uses a lightbulb and LDR optical coupler of the time. The transistor determines the maximum current.
Any high-gain Darlington transistor can be used on this touch circuit. The load can be formed by...
This sophisticated transmitter was found in the June 1993 issue of Electronics Now magazine. The...
Antenova Grandis antennas can be purchased from Mouser Electronics for frequencies from 868 MHz to...