Discrete Transistor Oscillator and Amplifier Schematic for 433 MHz TX

The discussion centers on designing a discrete transistor oscillator and amplifier circuit for a 433 MHz transmitter without using integrated modules. Challenges highlighted include achieving correct coil and resonant frequency tuning at 433 MHz, ensuring frequency stability, low harmonic output, and regulatory compliance. Most commercially available solutions use modules or SAW (Surface Acoustic Wave) resonators for frequency control. A suggested approach involves using a discrete circuit with a SAW resonator, similar to a crystal oscillator, to maintain frequency stability. The STX882 module schematic was shared as a reference, featuring discrete components and a SAW resonator. The original poster seeks only the carrier frequency without modulation and prefers building circuits without integrated circuits. The discussion also notes regional frequency regulations and the complexity of building stable, compliant transmitters at this frequency.
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