![]() ![]() One NEMA standard three prong outlet, along with a power on switch, and fused both on the input and output would do the trick. I also wanted simultaneous voltage and current metering. What I envisioned was the smallest enclosure with the largest practical variac that I could cram into it. Also, I wanted more power than my little two amp unit would put out. However, I was sure I could build one a lot cheaper and that’s what this article is all about.įor starters, that pile of leads and even the DMM had to go. Since deluxe versions of these variacs can run $500 and up, I just could not afford or justify buying a new one. Then, one evening when I inadvertently connected the wrong end of this test lead to the wrong end of that jumper lead, the whole project went up in smoke! It was at that point I said “enough” and set out to forever correct this messy situation. You can imagine that after a while, a “rats nest” of twisted, jumbled meter leads and jumper leads were all over the place - quite annoying! Then, when any change was needed or performed, it was swapping leads back and forth again. Common scenario: Measure the variac’s set voltage, connect load, disconnect DMM and change leads for current measurement, reconnect everything, and hook up to load. To perform tests in this manner, it was awkward to say the least. ![]() Up until recently, my barebones test setup consisted of a two amp variac, a DMM, and a collection of test/jumper leads. For the last 10 years, I have needed to use a variac for various bench testing. ![]()
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