This is a small transmitter is a good stable QRP transmitter, which has many uses, from the HF bands AM transmitter, radio control models, or AM / CW ham-band transmitter. Circuit is almost ridiculously simple, and construction is even simpler. It is basically a single transistor oscillator with very low output impedance, suitable for driving [...]
The circuit is in two halfs, an audio amplifier and an RF oscillator. The oscillator is built around Q1 and associated components. The tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz. These components can be used from an old MW radio, if available. Q1 needs regenerative feedback to oscillate and this [...]
The picture to the left is a high quality radio transmitter for the A.M. broadcast band. The transmitter legally operates with “micro-power” and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is excellent. Although the schematic looks somewhat complex, the circuitry is easy to build and [...]
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