This is the receiver for the earlier system published in the August 1988 Radio Electronics magazine. Optical capabilities can be used for extended range.
This circuit consists of a voltage regulator for 6 V batteries with a very low voltage drop. The...
This simple two transistor timer can be used to measure short time intervals. The power supply...
Other CMOS gates can be used in this sensor, which we found in the July 1995 Electronic Now...