I have a problem designing a small project of mine.
I have the need to switch the outputs of a COmputer ATX Power supply. Its about 200W and it's purpose is for testing motherboards.
the problem is, Im using shunts to get a small Voltage the reads back to a Atmel Arduino to scale it and provide a Current Value to display on a Grahing LCD.
If I use a Relay to switch the PSU ouput between the Board under test, or a Dummy Load (a few 5 Ohm, 5 Watt Resistors arranged to draw about 1A from each of the Voltages 3.3, 5, 12). The relay contacts will have some resistance each time they open and close and that will throw off my current readings. I need a Solid-Contact way to switch <=10A on the 12V and 5V side with little/no resistance from contacts.
Any help is appreciated
I have the need to switch the outputs of a COmputer ATX Power supply. Its about 200W and it's purpose is for testing motherboards.
the problem is, Im using shunts to get a small Voltage the reads back to a Atmel Arduino to scale it and provide a Current Value to display on a Grahing LCD.
If I use a Relay to switch the PSU ouput between the Board under test, or a Dummy Load (a few 5 Ohm, 5 Watt Resistors arranged to draw about 1A from each of the Voltages 3.3, 5, 12). The relay contacts will have some resistance each time they open and close and that will throw off my current readings. I need a Solid-Contact way to switch <=10A on the 12V and 5V side with little/no resistance from contacts.
Any help is appreciated