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Show a circuit diagram of AM transmitter

2016-04-09 12:32  
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The following shows the AM transmitter circuit. The circuit is very simple, and very practical. Recommend Duokanjibian The schematic in order to master this principle. I hope to be helpful to your work. Before you read this diagram, in order to better grasp the principle, perhaps you can first understand what an important component of the circuit: BC109C . This circuit is in two general, audio amplifiers and radio frequency oscillator. This oscillator is based on Q1 and related components. Tank circuit L1 and VC1 is tunable from about 500 kHz to 1600 kHz. These components can be used from an old MW radio, if available. Q1 to regenerative feedback oscillation, which is achieved by connecting the base and collector of Q1 to the ends of the tank circuit. 1 nf capacitor C7, couples signals, based on 100 years, and C2 L1 pf ensure oscillation through the collector, emitter, through the internal resistance of the transistor base-emitter, once again return to base. Resistor R2 has an important role in this circuit. It ensures that the oscillation will be transferred to the ground through a very low internal emitter resistance, reinsurance Q1, also increased the input impedance, so that the modulation signal will not be diverted. VC1 oscillation frequency adjustment. Q2 is wired as a common emitter amplifier, C5 separation emitter resistor and realized that at this stage the total gain. The microphone is an electret condenser microphone and volume modulation is based on the 4.7 k is preset resistor P1.

 


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