73510039
Nov 23, 1984
May 27, 1986
MODULATING AMPLIFIER WHICH PROVIDES CURRENT TO A LIGHT EMITTING DIODE, AND WHICH RECEIVES CURRENT OF VARYING AMPLITUDE FROM A PHOTODETECTOR AND SELECTIVELY CONVERTS THE CURRENT TO A DIGITAL OUTPUT BY MEANS OF AN ON AND OFF SWITCH, TO PROVIDE CURRENT FOR A COMPUTER, COUNTER, OR SIMILAR DEVICE
Electrical and Scientific Apparatus