Electronic Circuit Basic Low Power AM transmitter Based on Transistor

Radio. - Here is Electronic Circuit Basic Low Power AM transmitter Based on Transistor like in Figure 1 below. In this circuit the basic component used is transistor and capacitors and inductor used to generated AM signal.

Circuit Schematic

Component Part
  1. L2 450 uH
  2. C7 0.1uF
  3. Q1 and Q2 2N3904
  4. Resistors (see in Figure 1)
  5. Capacitors (see in Figure 2)
Description

Electronic schematic like in Figure 1 above is Electronic Circuit Basic Low Power AM transmitter Based on Transistor. According Electroschematics site that This transmitter is basic but allows transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, together with a modulator stage, which mixes the incoming audio and the RF. A signal appears on the output, which has an AM component that can be picked up on a nearby AM radio receiver.

The transmitter consists of oscillator stage Q1 and modulator/buffer stage Q2. Q1 is biased via R1, R2, and R3. L1, C3, and C4 form the tank circuit with feedback network C3-C4 providing feedback to the emitter of Q1. RF voltage at the junction of C3 and L1 drives buffer/modulator stage Q2. Q2 is biased by base current produced by RF rectification in the base emitter junction of Q2. C6 is an RF and AF bypass capacitor. C9, C10, and L2 form the tank circuit for the collector of Q2. RF is taken from the junction of C9 and C10 and fed to a short-wire antenna. Audio is fed to modulator Q2 via C8 and isolation resistor R5 and mixes with the RF signal in the collector circuit of Q2, producing a signal that has sum and difference frequencies if the RF carrier and AF input  along with the carrier signal.

Please read more this description about Electronic Circuit Basic Low Power AM transmitter Based on Transistor using link here.
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