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Friday, June 14, 2013

FM Transmitter using a single transistor!

Intro: (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. This contrasts with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency remains constant. wikipedia

Many thanks to Richard McWhorter (AllAmericanFiveRadio) for the idea and circuit diagram.

In my setup I biased the transistor in a different way. I used 3.5 volts to power the circuit. 
Here is my modified circuit. It works with 1.5 volts and has an excellent range without an antena.
Please note that the 1uF capacitor and the positive terminal of the 1.5V both are connected to the center of the coil.

Tuesday, June 11, 2013

1.5W Tesla Coil / Exciter - Test 2

In this test I added a 5pF parallel to the primary coil. The circuit draws less than 
100 mA at 18V(about 1.5W). In the first test the circuit consumed 6W of power.

Saturday, June 1, 2013

New Tesla coil - First test

My new and bigger tesla coil running at 30V/200mA 
I realized its capable of working as an AM transmitter on multiple frequencies (from 3V) 
and also FM frequency !!