Alexanderfitu
New Member
Hi all
First of all, I have always been a tinkerer, but never properly understood the more complicated electrical circuits.
Anywho, I am trying drive a tachometer, that takes 12v pulses from a compression ignition engine (therefore no spark ignition to measure RPM).
My idea is to have a Magnet on the flywheel, then a proximity sensor feeding 12v to the tach when the magnet passes by.
The proximity sensor I am going to use is a Cherry Mp1013:
![vss.JPG vss.JPG](https://www.electro-tech-online.com/data/attachments/48/48107-fcc97f912860569649bba458bfcf7bae.jpg)
This shows it needs a pull up resistor between VCC and Ground. based on a 13V input voltage, what resistor would I need.
Can anybody confirm that my circuit diag here isnt completely wrong![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![rev2.JPG rev2.JPG](https://www.electro-tech-online.com/data/attachments/48/48108-03e89901d90bd95b6dbf9a1ef6f90210.jpg)
Thanks in advance
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
First of all, I have always been a tinkerer, but never properly understood the more complicated electrical circuits.
Anywho, I am trying drive a tachometer, that takes 12v pulses from a compression ignition engine (therefore no spark ignition to measure RPM).
My idea is to have a Magnet on the flywheel, then a proximity sensor feeding 12v to the tach when the magnet passes by.
The proximity sensor I am going to use is a Cherry Mp1013:
![vss.JPG vss.JPG](https://www.electro-tech-online.com/data/attachments/48/48107-fcc97f912860569649bba458bfcf7bae.jpg)
This shows it needs a pull up resistor between VCC and Ground. based on a 13V input voltage, what resistor would I need.
Can anybody confirm that my circuit diag here isnt completely wrong
![rev2.JPG rev2.JPG](https://www.electro-tech-online.com/data/attachments/48/48108-03e89901d90bd95b6dbf9a1ef6f90210.jpg)
Thanks in advance