SOLUTION 2

Build a pulse voltage limiter/regulator.

You will need the following components.

1) 1 x 4K7 resistor (0.25 watt) [order code 9463739 Have to buy many]

2) 1 x 5.1 volt zener diode (0.5 watt) [order code 3162412 have to buy 10 or more ]

Can get these online @ www.farnellinone.co.uk

Parts total should cost more than £1.50
Postage will cost MORE than parts and they have a minimum order price of £20

Could buy much cheaper elsewhere but I like online delivery they do



Resistor has no polarity. Label ends A and B.

Zener diode IS polarity sensitive.
The end with the black band/stripe is the POSITIVE, the other NEGATIVE.



1) Connect resistor end A to the coil negative. (Pulse input to our circuit)

2) Connect the NEGATIVE end of the zener diode to EARTH.

3) Connect resistor end B to zener diode POSITIVE and to the rev counter.


Thats it !!!


You do this at your own risk as if you make a mistake, its possible to
damage your new rev counter.