Mini FM Station for Home. Starter Project 7

9AThis Tiny FM Station can transmit the Songs from an MP3 Player though out the home. Its range is around 100 Meters and operates in the 87.5 MHz frequency. The songs can be heard in a Mobile Phone, FM Radio, Music system etc placed in any room. The unique feature of the FM Transmitter is that it has no Trimmer capacitor . Instead a fixed capacitor is added with the coil to form the Tank circuit. So there is no need for tuning the FM Transmitter. The FM radio will pick its frequency during scanning.
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Joule Thief Circuit. Start Up Project 5

J1You can turn on a 3 Volt LED just using 1.5V Battery. It is the Joule thief circuit doing the trick. Joule thief circuit is a self oscillating voltage booster used to drive light loads like LED. The name Joule thief is given to the circuit because; it is stealing the Joule or energy from the battery. That means, it is extracting energy even from an almost dead battery to power a load. Try it. This is one basic circuit you should know as a starter in electronics.
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