In message <003e01ca3199$8c3ac6e0$5d0010ac@radianse.com>, Olin Lathrop writes >Andy Tuthill wrote: >> I've never worked with these sensors before but understand that they >> provide an edge trigger of about 50 mV when they sense a gear tooth >> within range. > >I assume you mean the magnetic coil type? If so, the output voltage has a >lot to do with how fast the tooth is going by and how close it is to the >sensor. From memory the LM2917 Frequency to voltage converter datasheet/app notes contain some useful info that may help the OP. He might also want to check out the DIY-EFI and EFI332 mailing list archives, they covered the signal conditioning for this type of sensor pretty well including schematics using LM1815 chips, which also have some good info on that type of sensor in the datasheet and app notes. > -- Clint Sharp -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist