On 11/20/2012 11:28 AM, Gene Heskett wrote:
> But I wanted something at about 40 volts for the lathe & wound up making an
> unregulated linear for 10% of the cost of a switcher at the time. Loaded
> up, its doing about 37 volts so I missed my target, but it gets the job
> done, moving the lathe at very good speeds. The linear runs hotter, but
> both are working well.
A little trick that just might get you to that 40 volts.
1. Find out what the max input current of the power supply is.
2. find a wall wart 5 volt transformer that puts out 5 volts at the
current specified in step 1 (it must be a linear wall wart).
3. Wire the primary of the wall wart to your AC in.
4. Wire the secondary of the wall wart between one side of the AC
input, and one side of the power suply transformer primary. The
goal is to have the 5 volts AC boost the line voltage to the main
transformer by a marginal amount, and increase the output DC
voltage. If the output DC voltage gets lowered, simply reverse the
leads on the 5 volt transformer secondary.
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