Simplest RF Transmitter


Posted on Feb 6, 2014

This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission is useful. It runs on 1. 5 to 3 Volts, with small hearing aid batteries or lithium coin  ce


Simplest RF Transmitter
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lls being ideal. A thermistor or photoresistor can be inserted in series with R1 to have a varying output frequency dependent on the input. The frequency can also be changed by changing the value of C1. A 2N2222 transistor is recommended, but you can try other types also. Performance tends to vary from type to type as well as from transistor to transistor. L1 is 20 to 30 turns of thin magnet wire (24 to 32 ga. ) close wound around a 1/8 to 1/4 ³ diameter non-conductive form. The coil is tapped 1/3 of the way from one end and the tap connected to the emitter of Q1. Experiment with all of the values in this circuit. Nothing is critical, but performance can be varied considerably. Tags: cheap RF Transmitter, easy RF Transmitter, RF Transmitter circuit, RF Transmitter design, RF Transmitter diagram, RF Transmitter schematic, simple RF Transmitter, The following diagram is the circuit diagram of Voice Transmitter which use FM signal carrier to transmit the vioce signal to the FM receiver device. Components List: R1 = 4. 7K R2 = 330 ohm C1 = 0. 001uF (1nF) C2 = 10-40pF C3 = 4. 7pF Q1 = 2N3904 L1 = see text Misc = Electret mike, . This the Good Quality FM transmitter for your stereo or any other amplifier gives you a pretty good signal strength up to a range of 500 metres having a power output of about 200 mW. This circuit can be operated with a 9V battery. The audio-frequency modulation stage is constructed close to transistor...




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