Introduction: Transistor Instead of Relay for Car Horns

About: Autistic person who's interests include utility cycling, recreational cycling, cycling safety, electronics, gardening, Arduino, and LEDs.

Instead of relays, you can use transistors for switching your car horns.

For my latest car horns for bicycles setup, I used an IRFZ44N N-channel MOSFET instead of a relay. MOSFETs use less current than relays and switch faster. So far, it seemed to work as well as relays. The pictures of my setup are in the next pages.

Step 1: Horn Setup

Step 2: Horns on Bicycle