Compact, Non-isolated, adjustable linear voltage regulator module utilizing a LM317 IC for a wide range input/output voltages. Built in heat sink and filter capacitors. Ten turn voltage adjustment pot. Easy to connect terminal strips for input/output voltage. Small enough to build into projects. Ideal for converting 5V to 3.3V on those Arduino experiments. Input: 4.2 40VDC Output Voltage: ~1.2-37V Vin -3V (4.2V-40Vin) Input to Output Differential: 1.6V Min Output Current: 1.5 A Regulation: 0.01%/V L: 1-7/16 W: 5/8 T: 1 WT: .02
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This is a good little regulator if you dont need a very low output voltage. I used one to replace a AA battery and set it to 1.5v and it worked for about 10 minutes and then failed. I thought it was just that one but a second unit failed in the same way. Seems like the scaling resistors are wrong and when using for a low output the pot heats up and fails.
Almost wonderful but great for the price.
I bought 5 of these because it would take many $$$ more to build them. One of the 5 proved to be defective when I tested them, the 317 shorted out. Ill probably just replace it with an LM350. They should have used about 350 ohms for R1 because the 200 ohms wastes much of the pots range. The pot should be mounted 180 degrees from the way it is. That way CW rotation will increase output voltage AND it would keep the heat sink from interfering with captive adjustment tools. So I would give future production units 5 stars if they bumped up R1 to around 350 ohms and reversed the pot mounting. The mfg. costs should be the same. Basing it on the LM350 would make the same board even better.
- Joe Stanko, IL
Good little supply
Can be a little tricky to get exactly the voltage you want, but they do a great job for the price. I use a ton of these for Arduino, lasers and video. They are great for POE.