Talk:PH Meter

Revision as of 12:11, 2 March 2010

Question : in the large circuit schematic, there seems to be a contradiction. The configuration table for the 14V version shows R1/R5/R6 as 10/10/12k respectively. It states on the right-hand side that the schematic itself is for the 14V version, but the schematic shows the other values.

I assume the schematic is correct and the column headers in the table are swapped. Please confirm ?

The voltage is swapped. pin 8 is Vcc+ and pin 4 is Vcc-

2009/03/23 - The above mentioned images have been corrected, and a capacitor was added to improve stability in noisy environments. :D

• I cant seem to get this to work on 0-14 or 0-5v. The readings will not go low enough.

op-amp: http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2294.pdf

hmm, will it read but just not entirely to 0? Have you adjusted vr2 ? You may try changing the values of one of the two resistors r5 or r6..

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