AXBB charge pump fault

[john swift]

yes , I think the AA6 is faulty

the first file is just a PDF copy of the 74HC14 data sheet

As the same AA6 transistor is used for all 8 opto-isolated outputs
the only obvious differance I can see is the charge pump has control of output 1
and you via mach 3/4 control of the other 7 outputs

any output should be able to control a relay

John

PS
looking back at an earlier post



I would of thought you should be able to change port 1's charge pump to another pin
for example to pin 2



John