Brief polarity indicator LEDs circuit

Connecting resistor in parallel but biased in opposite directions allows you to visually see which direction (polarity) the power supply is attached to the circuit at any given time.

Brief circuit schematics with short video – List of pages

Diagram

Using different color LED can be used to color code which direction the voltage is being applied, and that current is flowing.

Simple polarity indicator circuit schematic diagram by electronzap electronzapdotcom
Simple polarity indicator circuit schematic diagram by electronzap electronzapdotcom

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Brief capacitor charging RC time constant demonstration circuit

Video

Quick power supply polarity indicator LEDs circuit schematic to breadboard build

 





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