ATX Power for experiments

[BoyntonStu]

Just to make sure I understand correctly...


(+)ATX3(-)---(+)ATX2(-)---(+)ATX1(-)
.|............|............|......|
+15v.........+10v.........+5v.....Grnd

Assuming you used pins 4 (red) and 5 (blk), I don't know your setup. Should work unless you are also trying to do the same with another voltage at the same time. I know that most ATX power supplies use a common ground for all DC voltages.

Which brings up another question... How are you turning on each of the ATX power supplies? Grounding pin 14 is the preferred method. Since you raised the voltage potential of the ground in each ATX, you would be applying +5V to pin 14 on ATX2 and +10V to pin 14 on ATX3. You will need to make sure that you use the ground potential of ATX1 for each.

We may be getting somewhere.

Each ATX has the green wire connected to the black ground inside the box.

he remaining black wires go the the red of the next box.

The mount is plywood and there is a piece of plywood between each ATX.

Here's another clue.

If I use a 9V battery the meter reads right.

If I use a AC/DC 9 V plug the meter is not correct.

I believe that the AC supply is having its effect.

I am using only 2 wired for the AC.

I don't know whether the ATX cases are at ground potential.

I was careful with the polarities while soldering the 2 wire connections.

The output is certainly ~ 15 VDC.

The 10 Volt point measures 10 Volts.

Still confused.


BoyntonStu

[BoyntonStu]

All was needed was a 500 ohm resistor across the 12 V Adapter.

Any stray transients are grounded.

Next, I will try the 10 V tap.

FWIW

BoyntonStu

[Q-Hack!]

All was needed was a 500 ohm resistor across the 12 V Adapter.

Any stray transients are grounded.

Next, I will try the 10 V tap.

FWIW

BoyntonStu

Impedance matching?