eBay Cheap: $0.75 Electronic Doorbell Kit NE555
A very cheap electronics kit bought on eBay for just 50p. It makes a nice two-tone sound. But there were a few hiccups along the way.
Perfect Doorbell Suite Electronic Production Doorbell Suite DIY Kit NE555 F5
Perfect Doorbell Suite Electronic Production Doorbell Suite DIY Kit NE555 F5
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