Comments on: Homemade Arc Welder using Microwave Oven Transformers (MOT)

By: Delta Digit

Delta Digit — Sat, 05 Feb 2022 05:23:48 +0000

In reply to Kevin. If you have 110V in your home mains then you can set the primary input in parallel to take 110v but make sure your circuit breaker can provide that much current in 110v circuit. In case of your secondary, put the 10 AWG cables of both transformers in series to add up voltage. For the power switch and light indicator, you need to put them in the primary input circuit.

By: Kevin

Kevin — Fri, 04 Feb 2022 23:02:30 +0000

I have 2 wire o coming out from each primary and two from my wound 10 AWG secondaries. I plan on using a 110v power cord connected to each of the primaries and then i have my secondaries wired in parallel i think. Is that correct and how do i connect a light switch to turn on and off and a small power light to indicate power on.

By: Delta Digit

Delta Digit — Fri, 01 Jan 2021 10:35:39 +0000

In reply to simonsokotela. That is quite thick. It may be hard to put many rounds of wire in the secondary winding with 4AWG. Try to put a bit thinner cable so that you can get around 15 turns and 15 volts.

By: simonsokotela

simonsokotela — Fri, 01 Jan 2021 09:59:32 +0000

I don’t have a 12 gauges wire,only have 4 gauges wire,can it work when I put together the 4 gauge wire.

By: Delta Digit (Delta Digit Media)

Delta Digit (Delta Digit Media) — Tue, 07 Nov 2017 04:32:45 +0000

In reply to Murugan. You need a transformer from oven. It originally steps up voltage but you cut the secondary and wind a new thick coil to step down to about 15 volts from one transformer.

By: Murugan

Murugan — Tue, 07 Nov 2017 04:19:07 +0000

Which type of transformer can be used stepup or stepdown transformer and which volt transformer I need to buy