tach ckt using LM2917 - Frequency to Voltage Converter
Thanks to 3VO, KCHRISTE and ERICGIBBS
Here's something I found that might work as a tachometer for me. I'll have to order the part.
LM2917 - Frequency to Voltage Converter
**broken link removed**
• Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups
• Op amp/comparator has floating transistor output
• 50 mA sink or source to operate relays, solenoids, meters, or LEDs
• Frequency doubling for low ripple
• Tachometer has built-in hysteresis with either differential input or ground referenced input
• Built-in zener on LM2917
• ±0.3% linearity typical
• Ground referenced tachometer is fully protected from damage due to swings above VCC and below ground
I don't know why the image didn't present itself, but
more info. on this site:
**broken link removed**