Re: +/- SENSE and A SWITCHING PS

In article <jrbyk.1011$393.331@trnddc05>, jamessweet1@xxxxxxxxxxxxx
says...

James Beck wrote:
In article <78454c12-42a9-493c-ad56-
20eef0e96e7e@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, nabours@xxxxxxxxxxxx says...
On Sep 9, 8:03 pm, vettor...@xxxxxxxxx wrote:
Hey all,
I have a cyberball machine that I am trying to put a new switcher
into. On the schematics, there are +/-senses with the 5V and GND. In
previous posts, some have said these sense wires could be hooked up to
the 5V and GND, yet some said they can be left unattached. What is
the best way to hook up power in this case. Thanks.
Whenever I have come across this, (Atari used this a lot) The plus
sense went to +5 and minus sense went to ground. I didn't blow
anything up and my games worked again, although hook up at your own
risk. Good Luck!

Yep, the sense lines are just a way for the power supply to adjust for
the voltage drop of the wires and connectors on the way to the load.
Normally they would be connected to the power on the PCB, but for
"normal" use, you are correct. +Sense to the +power and -Sense to
ground is the proper way to do things.

Jim


Leave them disconnected, if you get an open circuit on the main power
wires, the current will flow through the sense wires instead, usually
they're thin and will burn up. Additionally, you can use them to
conveniently measure the voltage at the board and adjust the power
supply accordingly.

You don't understand, hook then to the + and - AT THE POWER SUPPLY, not
the PCB. Floating sense lines can cause problems depending on the
design of the supply. One thing is for sure, if you hook them, as I
stated, you will not have any problems.

.

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