The illusive Boxford 260vmc

[Ricardoco]

see my post above... connected to BOB ground alongside pin 8

Thanks Irving, its working now, had to connect the rtn to chassis ground... Next job is put together the TACHO!!! this is just a temporary one as im going to give cash to this person who is designing "The Ultimate Rev Counter"!!:naughty:




Rick

[irving2008]

Thanks Irving, its working now, had to connect the rtn to chassis ground...

That suggests a ground fault... is your BOB optoisolated?

Next job is put together the TACHO!!! this is just a temporary one as im going to give cash to this person who is designing "The Ultimate Rev Counter"!!:naughty:

Lets just see if we can get the project off the ground first.... so many toys to play with, so little time to do so....

[Ricardoco]

That suggests a ground fault... is your BOB optoisolated?
....

Yes it is, its the one from cncdoctor co uk

Lets just see if we can get the project off the ground first.... so many toys to play with, so little time to do so....

Hey ive got the simple one, thats fine, im willing to wait, ive lots of toys to be getting on with too lol

[irving2008]

Yes it is, its the one from cncdoctor co uk

Ah... which position have you got J1 in... are your commons +5v or ground? If you have the commons at +5v then RTN needs to be connected to the -ve (ground) side terminal of the power supply input for the BOB, rather than a general chassis ground...

[Ricardoco]

Ah... which position have you got J1 in... are your commons +5v or ground? If you have the commons at +5v then RTN needs to be connected to the -ve (ground) side terminal of the power supply input for the BOB, rather than a general chassis ground...

I will check in the morning, out of interest does the gnd pin on the BOB go to ground..lol