$4.95 per ea

Quantity Price
ea $4.95
10+ $4.45
25+ $3.45
per ea
All prices shown are (inc. GST)


LM2917 Frequency to Voltage Converter

The LM2917 is a monolithic frequency to voltage converter with a high gain op amp/comparator designed to switch a relay, lamp, or other load when the input frequency reaches or exceeds a selected rate.
The tachometer uses a charge pump technique and offers frequency doubling for low ripple, full input protection as the output swings to ground for a zero frequency input.


  • Ground referenced tachometer input connects directly to variable reluctance magnetic pickups
  • Op amp/comparator has floating transistor output
  • 50 mA sink or source to switch relays, solenoids, meters, or LEDs
  • Frequency doubling for low ripple
  • Tachometer has built-in hysteresis with a choice of differential input or ground referenced input
  • Built-in zener
  • +/-0.3% linearity typical
  • Ground referenced tachometer is fully protected from swings above VCC and below ground

Output swings to ground for zero frequency input
Simple to use VOUT = freq.IN x VCC x R1 x C1
Only one RC network provides frequency doubling
Zener regulator on chip allows accurate and stable frequency to voltage or current conversion

Over/under speed sensing
Frequency to voltage conversion (tachometer)
Breaker point dwell meters
Hand-held tachometer
Speed governors
Cruise control
Automotive door lock control
Clutch control
Horn control
Y Touch or sound switches

Information & Downloads

Warranty & Returns


We offer 12 months warranty on this product from its date of purchase. This is available from Altronics stores, online purchases or Altronics resellers. In accordance with our full warranty terms we will repair, replace or refund if goods you have purchased from us are defective.


Not withstanding our warranty policy, if you are dissatisfied with our goods or service you may return the goods within 14 days of our despatch date. Simply contact us for a return authorisation number and we will refund your purchase in full, less transport costs on receipt of goods. All returned goods must be in as sold condition including all packaging, instructions, invoices etc.