Quick single switch controlled alternating flashing LEDs circuit

Table of Contents

Alternating flashing LEDs with a just a single mechanical switch can be done. This circuit is probably not practical, but building it helps understand electricity better.

Diagram

Simple single switch controlled alternating flashing LEDs circuit schematic diagram by electronzap electronzapdotcom
Simple single switch controlled alternating flashing LEDs circuit schematic diagram by electronzap electronzapdotcom

Affiliate link ad.Nice looking supply.

The circuit as shown in the diagram will work well with a 5V supply for Vcc. Higher voltages will likely need more than 220Ω from Vcc to the switch if the current/power limits of any component is exceeded.

2 LEDs of the same color will need twice the voltage to conduct as a single LED with little to no resistance added to it. Switching the single LED on drops the voltage across the 2 LEDs enough to turn them off.

Video

Quick single switch alternates flashing LEDs circuit schematic to breadboard build by electronzap

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