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BrianG · 05.22.2008, 04:50 PM

I found a couple places online that stated the output to be about 10A. If the output current dropped, the main pass transistor was likely bad. The other one with the high voltage was either the actual regulator IC (or zener diode in some designs) that went bad, or maybe just a dirty trim pot. Too bad you threw them away already.

Be wary of high currents on the 12v line when looking for computer PS units, especially the cheaper ones. Many times, that high current value is actually two 12v rails combined. Try for a PS with a SINGLE high current 12v rail. And be aware that the voltage WILL drop to under 12v when loaded heavily, which is all the more reason to get the highest current supply you can get for the money. Depending on the design, you may be able to tweak the voltage back up to ~13-14v unloaded via a trim pot.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	05.22.2008, 04:50 PM I found a couple places online that stated the output to be about 10A. If the output current dropped, the main pass transistor was likely bad. The other one with the high voltage was either the actual regulator IC (or zener diode in some designs) that went bad, or maybe just a dirty trim pot. Too bad you threw them away already. Be wary of high currents on the 12v line when looking for computer PS units, especially the cheaper ones. Many times, that high current value is actually two 12v rails combined. Try for a PS with a SINGLE high current 12v rail. And be aware that the voltage WILL drop to under 12v when loaded heavily, which is all the more reason to get the highest current supply you can get for the money. Depending on the design, you may be able to tweak the voltage back up to ~13-14v unloaded via a trim pot.