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Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove
Turbidity is not
Count Rate of 35MHz
The 74HC Family use silicon gate CMOS technology to achieve operating speeds similar to the LSTTL family but with the low power consumption of standard CMOS integrated circuits
Polarity marked on the case
DC Motor/Stepper/Servo Driver Shield for Arduino 9 v Patented technology by Spectra SymbolDC Motor Stepper Servo Driver Shield for Arduino (L293D) is a dual channel H Bridge motor driver capable of driving a pair of DC motors or single stepper motor. The shield offers total 4 H Bridges and each H bridge can deliver up to 0. 6A to the motor. It can drive up to 4 bi directional DC motors with individual 8 bit speed selection (so, about 0. 5% resolution). It can drive up to 2 stepper motors (unipolar or bipolar) with single coil, double coil,