Semi-finished tachometer

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.

 

One thought on “Semi-finished tachometer”

  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

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