Question from a reader: Getting enough current for my car horns

I recently got the following question: "I wanted to ask your help. I have two horns on my car, they draw about 10A. I want them to honk with a little delay. How would I set up a circuit so that I can supply enough current for them? Thank you" ​ The question was asked in an article about using a 555 timer to create a delay. But a 555 timer can only provide about 0.1A… So when you want to control something that needs more current, you have two main options: Add a transistor, or add a relay. A transistor is a good and simple solution. But when we're talking about currents as high as 10A, you need to take care. You must choose a transistor that can handle as much as 10A. And you must make sure that all connections, connectors, and wires are thick enough for that amount of current. An easier way: A relay module. Choose one that is sized for the voltage and current you need, and the connectors and everything should be properly sized for you. ​ You just need to make sure you choose wires that are thick enough. ​ ​Keep On Soldering! Oyvind @ build-electronic-circuits.com PS: Wherever you are on your journey, if you want to improve your electronics skills - here are two ways I can help you learn electronics: ​Getting Started With Electronics is the first eBook I wrote to help people get started. It's a step-by-step guide with simple instructions to get started building electronics. Perfect for complete beginners. ​ ​Join Ohmify: Ohmify is for people with little or no electronics understanding who want to be able to confidently create electronic gadgets and tools – and who are prepared to take action to make it happen.

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