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This is a very useful circuit for the people who have cars and vans because this circuit operates with 12V.Operating frequency of this circuit is 160 Hz.And you can send signals about 2M-5M or 2M-15M it depends on the audio transformer which you use.by tuning 100K you can get the maximum distance # Use common audio transformer # Build this circuit on a PCB # Be patient and tune carefully # don't supply over 12V

I think most of you like to make transmitters today I'm going to give you a video transmitter.The special thing of this transmitter is you can operate this circuit with 9V power supply and you can send signals about 100M.I have used this circuits for my security camera system it's working well and also when we do a concert or a musical show we need to send live videos to a big screen or a projector normally video transmitters are quite expensive but you can build this circuit with less than $10 Here I used Bc 108 Transistor If you are unable to find Bc108 you can use similar Transistors like BC337, BC546 , 2N2222   Note # Build this circuit on a PCB # without connecting an antenna don't give the power to the circuit # Build this circuit in a little space

I think this circuit will be very useful for you all to get some electricity when you are in a power cut.You can get  power to light up several LED bulbs. I suppose Even a LED is very valuable when you are in the dark.after building this circuit connect your circuit to the telephone line through red and green wires. to get power connect your cables to + and _ lines.  This is only for educational purpose .Free circuit diagrams 4U team doesn't get any responsibility of  misusing this circuit. # Build this circuit on a PCB

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