WAZIPOINT Engineering Science & Technology: How do you know if a transformer is step up or step down?
![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 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](https://ae01.alicdn.com/kf/HTB1p5JjLOrpK1RjSZFhq6xSdXXan/Ultra-Small-Mini-DC-DC-Step-Down-Power-Supply-Module-3A-Buck-Converter-Adjustable-1-8V.jpg_Q90.jpg_.webp)
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
![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)