Build this, put it in an ideal location. Instant flashing security system warning light for your cars. I did, and everyone thinks I installed a security system. That is one cost effective car alarm.
This is a good little project for a beginner just learning how to assemble. I used this to simulate an auto alarm. Works great!
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Easy and quickly bought my TV component and used tutorial to fix. Now have a working TV again for a tiny fraction of cost of a new TV, so very satisfied.