The picture above shows a 2km FM transmitter circuit. This circuit is divided into three stages: oscillation, frequency doubling, and power amplification. V1, C2--C6, R2, R3 and L1 in the circuit form a capacitive three-point oscillator. Its oscillation frequency is mainly determined by the parameters of C3, C4 and L1, and its oscillation frequency is 44 ~ 54MHz. The signal is from the center tap of L1 The output is then coupled to V2 through C7 to amplify. The double frequency signal of 44 ~ 54MHz is selected by C8 and L2, that is, 88-108MHz. This signal is coupled from C9 to V3 for power amplification. V3 consists of three 3DGl2 transistors connected in parallel , Can expand the output power. When the circuit works normally, the current is about 80-100mA. The three 3DG12s that make up V3 can be added with appropriate heat sinks to prevent overheating. During the production, L1 ~ L3 are wound with a single layer of 0.31mm enameled wire on a round rod with a diameter of 3.5mm.
Fiber Attenuator ,generating a adjustable Loss to the fiber optic link,are used to control the power level of optical signals at the outputs of light sources and electrical-to-optical (E/O) converters. Fiber Attenuators use several methods of attenuation,including air gaps, micro-bends, acoustic-optic modulators, and electro-optic modulators.The attenuation range is from 1dB to 30dB.Meanwhile,They are high attenuation accuracy and working temperature from -40 C to +75 C.Series of Fiber Optic Attenuator include Variable Optical Attenuator,Inline Optical Attenuator and Fixed Optical Attenuator.They are compatible with the fiber optic products currently available in the international market.Foclink,a reliable supplier of fiber attenuator,is always beside u 7*24.
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