Hi Kim, > > +5V -5V +12V -12v > > --- ---- ---- ---- > >150W 15A 0.5A 5A 0.5A > >180W 18A 0.5A 7A 0.5A > >200W 20A 0.5A 8A 0.5A > >230W 23A 0.5A 9A 0.5A > >250W 25A 0.5A 10A 0.5A > > > >You may need quite a load on the +5V output to > >make sure the power supply is in regulation. > > > >Of course your mileage may vary. > > > >- -Mark > No doubt about it, an old PC power supply would be great to run some PIC > projects but how do you 'fake' the 'power good' input, in my experience the > power supplies won't run without this feedback (orange wire I think). As mentioned the PowerGood line is an output from the PSU It is infact a very nice active low reset signal BUT it has very limited drive capability on many PC supplies, I would put a 10K resistor in series with it before trying to use it but you can leave it open. Loading should as suggested be done on the 5V line and 10% of the rated power is usually safe. For the 150W supply you would need 1.5A which is 7.5W of dissapation (a 10W 3.3Ohm resistor will do the trick nicely and you can fit it inside the PSU to the air vent holes with some small screws, WARNING a lot of the heatsinks inside the PSU are at mains potential so when you decide on a place to put your load resistor do not allow it to get NEAR the other components) so you can wire it up with a spare floppy power lead onto the red and black wires and cut the other black and yellow wire short at the PCB. You can also preload the +12 V supply to improve the regulation using 5% of the rated load, the internal fan is usually connected to the 12 V output as well. With the 150 W supply again you can use 0.25A giving 3W and a 5W 47 Ohm resistor will do the trick. The PowerGood line is suitable for driving a PIC MCLR pin with just a resistor and it will hold the device in reset until the power is stabilised. The basic stamp may not co-exist with the Powergood signal but it has already got a small measure of reset circuitry on board so I would ignore the PowerGood signal. Cheers -- Kalle Pihlajasaari kalle@data.co.za Interface Products Box 15775, Doornfontein, 2028, South Africa +27 (11) 402-7750 Fax: +27 (11) 402-7751