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- Jun 12, 2014
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You are looking at a very large transformer (650-800VA) to put out 25-30A rectified DC at the other end, most computer chargers are 1-2A (maybe 30VA). A transformer of this size would be very heavy, shipping alone would be expensive, not something you have laying around. Just being practical, I think you are better off with a switching power supply at the end of the day. As mentioned you want fusing, power switch, enclosure, etc. which is going to add up. 30A is a lot of current, if you want to pursue a transformer design I would fuse both the input (6A) and output (30A). A DC motor would not typically need a regulated output, but may benefit from some filtering (RC), you would need very robust capacitors and resistors for this level of current. This is an 800VA 20VAC output that once rectified will be in the 24VDC range.
http://www.antekinc.com/an-8420-800va-20v-transformer/
If you just want to see if it works, get/borrow two car batteries and connect them in series with some jumper cables.
This one on eBay is $35 + FedEx shipping is $14.40, total under $50 is a deal, these normally sell for $250+.
https://www.ebay.com/itm/ARTESYN-Power-Supply-LCM600Q-Out-24VDC-27A-Max-4B/163146238161
http://www.antekinc.com/an-8420-800va-20v-transformer/
If you just want to see if it works, get/borrow two car batteries and connect them in series with some jumper cables.
This one on eBay is $35 + FedEx shipping is $14.40, total under $50 is a deal, these normally sell for $250+.
https://www.ebay.com/itm/ARTESYN-Power-Supply-LCM600Q-Out-24VDC-27A-Max-4B/163146238161