Introduction: Transistor Instead of Relay for Car Horns
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.