TELEPHONE RING SIMULATOR CIRCUIT


Posted on Apr 9, 2012

This project has been specially designed to introduce you to SMD (Surface Mount Devices). Surface Mount is really not new. It started as far back as 1940 with a hybrid circuit in a digital watch. A chip was cemented onto a slab of ceramic material having gold tracks and film resistors. The LED display was mounted in a similar fashion and the whole assembly coated in epoxy to protect it before fitting into the watch case.


TELEPHONE RING SIMULATOR CIRCUIT
Click here to download the full size of the above Circuit.




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