I use female banana jacks with wires soldered to the ground points and then connect them together if needed, I also use female banana jacks with wires soldered for the positive voltages - apart from not having a single failure ground point I get rid of all those pesky crocodile clips that fall off from time to time.
I also make use of the current limiting capabilities of my power supplies to make sure that they decrease the voltage if needed. /Martin On Thursday, 23 April 2015 11:20:31 UTC+2, Sgitheach wrote: > On 23/04/2015 03:13, JohnK wrote: > > A similar 'nasty' can happen to experimenters - if multiple voltages are > required on a board, don't 'common up' at the bench supplies with only one > common taken to the board. Lifting that common causes the 'total' voltage > to distribute according to the various resistances - eg your 3V ICs could > get most of the 12V IC's voltage. > [If you are new to electronics, try some calculations. OR just take my > word for it.] > > > John > > Thanks for this warning. It makes complete sense the way you have descibed > it (I'm not new to electronics but then I'm not a EE). My bench PSU is > currently powering an experimental board using -12, +12 and +5V. Loss of > the ground connection would not at all be good for the (expensive) 5V > parts. But how to mitigate the risk? The PSU has a common ground so I have > just run one ground wire to the board. I guess I must be doubly sure that > the connection is secure before I power up and while I use the board. Also, > I suppose I could put a 5V1 or 5V6 zener on the experimental board to try > to clamp the drop across the 5V-to-ground at the board (cheap and reusable > between experiments). Any other protection ideas would be good! > > Grahame > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/5d674fbf-09e8-4924-9752-c43528fdc94f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
