I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this.
Out of necessity, I am going to fashion a car battery charger from an ATX PSU. I need to draw ~14v to do this, I'm guessing from the +12v rail.
How can I tell if this will be possible for the PSU I have?
What I know:
- This model uses HA17431PNA shunt regulators, which I have located on the circuit.
- I will need to modify that IC's input circuit to adjust the regulator's voltage.
- This may also require me to adjust the output caps, but given the step-up value it also may not.
What I don't know:
- Precisely how to tackle this -- I have a decent soldering station and resistors, but this would be the first time I worked on something other than a phone/doing rework. I found the spec sheet from Hitachi for the regulator. What other resources should I consult?
- What generates DC from AC in an ATX PSU? A transformer? Is the transformer able to generate this voltage for me without affecting other components?
- How this will affect the current output on the rail.
- Any other unknowns regarding how this modification might impact the performance of the PSU.
Can someone please help me accomplish this task?
Thanks for your time.
17
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