Hi guys,
Ron, I was looking at the wrong pin, 9 is to vdd its 10 that is grounded.
Boncuk, your divider works fine and I even found a 1k 25 turn pot to use!
Anyway thanks to you guys I have it working, although there must be something iffy somewhere still as I had to as suggested use 10k instead of 100k in the divider because I cannot use the 2v scale. For some strange reason connecting pin 10 to vdd shorts out the circuit entirely so I left that as Gnd and changed the 100 to 1 to a 10 to 1 divider.
But as they say, don't mend what isn't broken so I'm happy enough! Though I would like to know if anyone else builds something with this IC if they can put Vdd to pin 10?
Just a couple more questions, Boncuk should I get the uni or single direction diodes which I assume would be used from Vdd to Gnd to kill spikes?
Or would it be better to use the diode on the circuit Before the 7805 regulator?
What voltage would you suggest to use on either one?
Thanks again Al