Tach input from spark voltage ** ERROR **

[tom cloud]

>>
>>I've been working on various inductive tach schemes with some success.  I 
>>want to try a new approach which would be to take the input to the tach 
>>from the "points" or "tach" signal from a car distributor (or whatever).

ERROR: *****************

>Example:  to trigger a CMOS gate:  put 100-k R in series.
>>From the gate input, put one diode with Anode connected to the supply,
>and the other with the Cathode connected to GND.

ERROR **** in the above ... I got it upside down.  Switch
"Anode" and "Cathode" above, elst you'll have a shorted supply!!

        [ snip da rest ]


Tom Cloud <cloud at peaches.ph.utexas.edu>