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| This 14-pin DIL IC is extremely easy to use since VOUT = FIN x VCC x VR1 x C2 where VR1 is the resistance between pin 3 and ground and C2 is the capacitance (in Farads) between pin 2 and ground. Features include ground referenced tachometer whose input interfaces directly with magnetic variable reluctance pick-ups; op-amp comparator with floating relays, solenoids, meters or LEDs etc; frequency doubling with low ripple; tachometer with built-in hysteresis for either differential or ground referenced input; built-in zener for accurate and stable frequency to current conversion and linearity typically ▒0· 3%. Applications include over/under speed sensing, tachometers, speedometers, breaker point dwell meters, hand-held tachometers, speed governors, cruise control, touch or sound switches etc. |
| A printed circuit board is available to make a frequency to voltage converter building block using the LM2917. A particular application is shown for a 20 LED display rev counter where this PCB is connected to the LM3914 pcb. |
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