Correct, you need to provide a Positive via a Resistor.

brilliant what value of pull-up would I need would 4k7, suffice?

 

Yes, what are you feeding the output into, a microcontroller or other chip?

 

Yes, what are you feeding the output into, a microcontroller or other chip?

another chip, a buffer: http://uk.farnell.com/on-semiconduc...meResp=All&searchView=table&iscrfnonsku=false

 

Yes any value from 4k7 to 20K will do.

 

Yes any value from 4k7 to 20K will do.

brilliant thank you so much I have really appreciated the advice