FM transmitter with a range of 1,500 meters, this very simple wireless microphone has a reach of ov

FM transmitter with a range of 1,500 meters, this very simple wireless microphone has a reach of over 1.5 km. Basically it is a jednotranzistorový LC oscillator tuning signal coming from the microphone via a decoupling capacitor on the base of the transistor. current The coil is formed directly on a printed circuit board, but if someone wants to do this, it is possible to make ordinary varnished wire. It has about 5 and 1 turn wound on a 5 mm diameter. The length of the antenna should not exaggerate, I use plain wire length of about 1 m, but it is good right direction. For this purpose I made a simple multimeter to the receiver, which is in Figure 2 multimeter switched to 200mV and the antenna is placed in the direction of the estimated revenue. After shooting a transmitter antenna to a maximum voltage of the receiver. I usually current have to have the antenna slightly bowed, from about half-cocked, I had it on another side to me in good stead wooden stick and tape. The microphone is very sensitive, so I disconnected the resistor that feeds the microphone (4k7) and entry to the country, current I joined trimmer 10k. The input trimmer I joined volkmen and on it I tuned a station in the AM for me to recognize it on the radio the other, or it is good to let go to be volkmenu Easy English. Described transmitter can be used for many things. Can be used as a basis for wireless control, but beware! Operation of the transmitter is disabled in the Czech Republic and its use is at your own image plates, it is needed current to halve a print with dimensions 2 cm 4 cm NOTE: Everything you are describing is true, because I have the microphone built and tested. You said I was trying to reach with ordinary FM receiver, so who has a sensitive range is even greater. In experiments I came to such an interesting thing: For us, the earth hard and therefore the range is so great, but I tried it in areas with soft sandy soil and there was a much smaller range. current I did not use to power nine-volt battery, but twelve volt battery due to increased current demand. If you want to reduce consumption of resources, it is possible to increase the value of resistance connected in the emitter of the transistor, but it also reduces current the power
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