Polarity Tester
thingiverse
Create a simple polarity tester with a bicolor LED and 1500R resistor. Use nuts and bolts to form probes for checking circuits from 3-15V. The green light indicates the right probe is positive, red signifies left probe positive, while yellow signals AC voltage. Place electronics inside a 3D printed housing, ensuring resistor placement is correct. Attach nuts to hold components in place and secure with cap. Tested up to 15V; LED may appear dimmer due to higher resistance. View assembly instructions on YouTube.
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