Additional mod to the tach:

1. Added ST L7812 voltage regulator to the circuit. Stabilize the input voltage to 12V

2. Added a 220uF cap on the regulator output.

3. Cleaned and assembled

IMG_20131011_123015

Test will be carried out on weekend on my VWs.

 

Average Rating: 4.6 out of 5 based on 184 user reviews.

One thought on “”

  1. Final Tachometer calibration result, (Based on industrial HP signal generator)

    Input frequency, Theoretical Tach reading, Actual reading, Repeatability, remark

    50Hz ; 1500 rpm ; 1600 rpm ; good ; Conditional accept
    100Hz ; 3000 rpm ; 3000 rpm ; good ; Accept
    200Hz ; 6000 rpm ; 6000 rpm ; good ; Accept

Leave a Reply