Re: one supply = two supplies

Rich Grise wrote:
On Sat, 08 Jul 2006 03:04:22 -0700, Big House wrote:

Hello

is there a way to "split" one 12 volt DC supply in two different output
still of 12volt DC each?

That is, I have one +12VDC and GND. From this, I need two +12VDC/GND
outputs where if I measure the +12V of one output with the GND of the
other output (and viceversa) I do not get anything. Like if I had two
different supplies.

I need this because I have two devices (a home alarm system and a GSM
dialer) that are connected by a phone cable. If I use the same power
supply, the line of the GSM dialer is always in USE (pciked up), if I
use two different sources of power, everything works fine.

Since one of my customers has to use these two devices in is truck and
he needs to use the 12volts coming from the battery, the goal should be
to have two different output.

Is there any simple way to do it?


First, I'd diagnose what is causing the circuit to malfunction when the
devices have a common power supply and ground - if merely using a separate
supply clears the malfunction, then there is some kind of wiring error.

Good Luck!
Rich

The OP apparently wants to stick something like this in a vehicle. He
should be aware that attaching anything to a vehicle battery is
applying 'the power supply from hell' to quote a LTC app note. He would
be better off just buying power supplies designed to plug into the
cigar/ette lighter socket which will at least provide clean power.
Alfatronix makes a nice range of them.

I currently design for the automotive market and it's quite a challenge
to meet the requirements for droop and load dump (ISO 7367) [in the EU
we also have to get what's known as an 'E' mark for anything connected
directly to a vehicle battery].

Cheers

PeteS

.

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