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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