WAZIPOINT Engineering Science & Technology: How do you know if a transformer is step up or step down?
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5 pcs Mini DC DC Buck Converter Step Down Module 1.3A Adjustable Step Down Conversion 12V 24V to 5V 3.3V 9V|buck converter|5v to 12vstep down dc-dc - AliExpress
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Ultra Small Mini DC DC Step Down Power Supply Module 3A Buck Converter Adjustable 1.8V 2.5V 3.3V 5V 9V 12V for Arduino diy kit|Integrated Circuits| - AliExpress
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5A 75W XL4015 DC DC Converter Adjustable Step Down Module 4.0 38V to 1.25V 36V DIY Adjustable Power Supply|power module|power supply modulecan module - AliExpress
![1 Phase Buck & Boost Step-Down Transformer - 240V Primary - 208V Secondary at 26.6 Amps - 50/60Hz - - Amazon.com 1 Phase Buck & Boost Step-Down Transformer - 240V Primary - 208V Secondary at 26.6 Amps - 50/60Hz - - Amazon.com](https://images-na.ssl-images-amazon.com/images/I/31l4Wmlb1nL._SR600%2C315_PIWhiteStrip%2CBottomLeft%2C0%2C35_PIStarRatingFIVE%2CBottomLeft%2C360%2C-6_SR600%2C315_ZA7%2C445%2C290%2C400%2C400%2CAmazonEmberBold%2C12%2C4%2C0%2C0%2C5_SCLZZZZZZZ_FMpng_BG255%2C255%2C255.jpg)