A alband Senior Member Feb 11, 2009 #81 Once, I took that look at the datasheet and found the 10K pull up resistor I did. This the explained why all the chips were working before, but when I simplified (or over simplified) they didn't.
Once, I took that look at the datasheet and found the 10K pull up resistor I did. This the explained why all the chips were working before, but when I simplified (or over simplified) they didn't.
S sghioto Senior Member Feb 12, 2009 #82 alband, This is a test circuit that will determine if the chips are OK. Double check the pin locations on all four comparators. Steve G. Attachments LM339 Test Circuit.JPG 50.6 KB Views: 11
alband, This is a test circuit that will determine if the chips are OK. Double check the pin locations on all four comparators. Steve G.
A alband Senior Member Feb 12, 2009 #83 Thanks, I may need to refer to that later, but I've got it working now, and in combination with a whole heap of other stuff!
Thanks, I may need to refer to that later, but I've got it working now, and in combination with a whole heap of other stuff!
