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This is what older style thermostats used to turn a heater or air conditioner on or off
Thedata is loaded into the associated flip flops and appears atthe outputs after the positive transition of the clock input
all outputs are forced LOW and unaffected by the data or address inputs
74HC157 (Quad 2-input Multiplexer)
All inputs are protected from damage due to static dis-charge by internal diode clamps to VCCand ground
Hall Effect Sensor (3144) drop sensor This is what older styleIntroduction : The hall effect 3144 is an integrated Hall effect non latching sensor. Holding a magnet near the sensor will cause the output pin to toggle. The hall effect 3144 is a digital output hall sensor. Features : Output: Digital. Operating voltage: 4. 5V to 28V (typically 5V). Output Current: 25mA. Output voltage: 4. 5V to 28V (typically 5V). Applications : Magnetic field Detection. Switching circuit. Magnetic door alarm system. Speed encoder.
US$ 28.00
US$ 836.50
US$ 100.91