If you want to increase the range of the transmitter then you must install the long high antenna with any wire. The coils and the antenna can be designed as a part of the PCB as an antenna if you make it on PCB. You can easily make this transmitter on PCB or without PCB because it consists of very few components. In this circuit, we have used an electret condenser microphone as an input source that gains signal in analog form. In this project, we are going to design a single transistor FM transmitter circuit that works effectively in a 1-2 km range.
#C200I TRANSISTOR FM HOW TO#
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Measure the current with the meter to about 2-3 mA. Using finger kickoff to stretch or shrink coil. Should adjust the total current of the circuit. If can not find the transistor number 2SC838. To tap out to the antenna at 3 turns (from input voltage) then adjust the all current of this circuit by Stretching or shrinking the coils and adjustable TC (trimmer) to have the current approximately 3mA the frequency in 90-100 MHz range.įigure 2 the components layout connection The coil-L is 8.5 turns of 22 swg wire wound with a inside diameter air core of about 5mm. Today lets to see the simple FM transmitters,90-100MHz that use two transistors, apply power supply with 1.5V battery T1_Transformer, Primary : 8 ohms, Secondary: 1.2KįM transmitters, 90-100MHz using two transistors and low voltage The T1 use the OUT PUT transformer of small RF receiver. The coil-L is 8 turns of 18 swg wire wound with a inside diameter air core of about 5mm.
This is the small FM transmitters using one transistor and 1.5 volts battery as power supply, in 98MHz to 100 MHz FM frequency range. Then adjust the all current of this circuit by Stretching or shrinking the coils and adjustable TC (trimmer) to have the current approximately 3mA the frequency in 88-108 MHz range.ĩ8-100MHz FM transmitters using one transistor and 1.5 volts battery You can use all transistor number : 2SC461, 2SC784, 2SC785 instead of 2SC183 transistor and 2SC668, 2SC77 for 2SC185. Then stretch the coil to width of 9 mm.Īnd to tap out to the antenna at 3 turns. The coil-L is 8 turns of 22 swg wire wound with a inside diameter air core of about 5mm.
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