AAlamo,
I agree 1000% with George. Please do not get caught in the trap of thinking you can design a power supply for less than you can buy one. I am in the electronics industry and it is my full-time job to design instrumentation products, including power supplies. I would STILL buy one even though I could draw out a schematic and parts list in about 10 minutes. In my present plating shop, I have two which I purchased. It's just NOT economical to do it--nor worth the time.
If you've never done it before, you will sink a ton of time into it and may never have a supply that works anywhere near as well as Caswell's.
Given what you're trying to do, don't mess with light bulbs and batteries. Just buy the power supply. You will be thankful to have a "stake in the ground" and one less variable to deal with when something in the process doesn't work later.
Capital equipment should be thought of as a depreciating expense. From a financial point of view, don't think of it as a big one-time expense. It really "amortizes" over the life of the equipment. A power supply will last 10 years. That is $30/year, or less than $2.50 per month. You'll pay more than that for protective gloves that you throw away.
Kind regards,
Ken
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