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  • ATX to Lab Bench Power Supply Conversion

    Great idea changing the transistor type I think it will work. Isn't the voltage for the regulators only referenced between their input and ground, not their output? The output voltage to ground would be regulated at the appropriate level but that then would be sourced to a lower voltage for the output ground causing the difference to only effect the load between the two? I am super new to this stuff and I find that I have some misconceptions. I asked a guy I know if that would be a problem and he said that I was correct to think it would work so long as I didn't exceed the amperage rating of the lowest rated circuit. I think I trust your reservations and experience enough to question my conceptions again.I am not doing this for any practical purpose. I am mostly just learning how all of...

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    Great idea changing the transistor type I think it will work. Isn't the voltage for the regulators only referenced between their input and ground, not their output? The output voltage to ground would be regulated at the appropriate level but that then would be sourced to a lower voltage for the output ground causing the difference to only effect the load between the two? I am super new to this stuff and I find that I have some misconceptions. I asked a guy I know if that would be a problem and he said that I was correct to think it would work so long as I didn't exceed the amperage rating of the lowest rated circuit. I think I trust your reservations and experience enough to question my conceptions again.I am not doing this for any practical purpose. I am mostly just learning how all of this works. If the power supply dies I wouldn't be too upset (though finding a 1AMP -12v on a power supply is exceedingly rare so I doubt I'd ever get a 2nd chance after I blow up this one).

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  • ATX to Lab Bench Power Supply Conversion

    I followed your instructions and I have the following voltages available to me:12v 18A (for each of two rails)8.7v 17A (12 to 3.3)7v 18A (12 to 5)5v 22A3.3V 17A1.7v 17A (5 to 3.3)12v 1A (from ground to -12v)15.3 1A (3.3 to -12)17v 1A (5 to -12)24v 1A (12 to -12)My quest: I want to use the 3.3v to turn on the transistor allowing the 24v from my ATX power supply to run a very small motor.My problem:3v3 is using common ground while the 12v is using -12v for groundI think that the 3v3 will now be using the -12v making it 15.3v not 3v3. I don't know if what I'm trying to do is possible.My question:Can I do what I'm trying to do without getting a lot more complicated?

    The ampere draw depends on what you are running, to lower the ampere draw you will need components that don't draw as many amperes. If you would like to limit amperes that the power supply will allow before breaking the circuit then try a circuit breaker. You can get mini circuit breakers for about $18 from a well known online industrial automation retailer rated for as little as 0.5A.

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