Experiment of 1 transistor TV transmitterI will show you a simple TV transmitter. But this is planned only for experiment. You can not make TV station with such a simple circuit. And experiment of this gear makes some interference for TV. I recommend you that you should make this experiment on the midnight. As you can see on the circuit, this is a VHF oscillator. The circuit of it is same as the oscillator on the TV convertor. Therefore you must use a transistor being sold to use for TV convertor. The ft of the transistor must be 650MHz or more. The video signal is put on the base of the oscillator. That makes a amplitude modulation. The video signal is generated by the video player or a digital camera. Of course a video camera can be used. Do not connect the antenna with this project! Connect the 10cm wire on the TV set on the same room as the antenna! The upper photograph shows the figure of received by the TV. Is it beautiful? My wife and my daughter and my thard son. Is becomes a colorless as you can see. The oscillator of this transmitter acts as a base grounded. Therefore the base must be grounded by the capacitor "47pF". Therefore the color signal of the video signal is omitted(terminated). The coil of this oscillator is made by 1mm enamel wire. It is winded around the blue pencil. Four turn coil oscillates a signal for the 1 to 3 channel of TV. Two turn coil oscillates a signal for the 9 to 12 channel of TV. You must tune the trimmer capacitor by the bamboo driver. You must also tune the potentiometer in order to get a good modulation. The change of the Vcc makes a change of the frequency. Therefore you must use a regulated power supply. I think 10mA will be enough. You will be able to enjoy a electric home brew with this project. But , be care not to make TVI for your neighborhood!
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