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Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /home/admin/domains/scienceflicks.com/public_html/bcms/bcmscore.lib.php on line 1616 eBay Cheap: $0.75 Electronic Doorbell Kit NE555 in Electronics Technology Videos | Science Flicks
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 http://www.ebay.com/itm/Perfect-Doorbell-Suite-Electronic-Production-Doorbell-Suite-DIY-Kit-NE555-F5-/111947302037
