RF circuits
Small radio circuits you can build on a bench. Each one comes with its coil, capacitor and bias values worked out, and with the legal power limit that applies in India.
Pages in this section
Lessons behind these pages
- Transistor oscillatorsColpitts and Hartley, and the loop-gain condition.
- ResonanceWhy one L and one C pick one frequency.
- Crystals and resonatorsWhen a free-running LC tank drifts too much.
- Impedance matchingGetting power from the stage into the antenna.
- The decibelReading dBm, dBi and path loss without a calculator.
- VaractorThe diode that turns audio into frequency deviation.