https://rfcorner.in/tags/digital-control/Recent content in Digital Control on Dhiru's NotebookHugoenSat, 20 Jun 2026 00:00:00 +0000https://rfcorner.in/posts/digitally-adjustable-pa-supply/Sat, 20 Jun 2026 00:00:00 +0000https://rfcorner.in/posts/digitally-adjustable-pa-supply/<h2 id="related-work">Related work</h2> <ul> <li><a href="https://rfcorner.in/posts/baby-qro-switching-amplifier/">Baby QRO Switching RF amplifier for HF</a></li> </ul> <p>A new generation of the <code>Baby-QRO switching amplifier</code> targets 25W to 50W of RF output for <code>FT8</code> and other FSK modes.</p> <h2 id="goal">Goal</h2> <p>The Baby-QRO amplifier already has a very useful RF power control knob: the PA drain voltage. A bench supply works for experiments, but it is not the right answer for a digital beacon or transmitter stack. We want the MCU controller to set the PA voltage, and therefore the RF output power, in software.</p>