Visit our Slack Channel and join the conversation in between episodes and please review us, wherever you listen (PodcastAddict, iTunes). Speaking of the Super Con all the videos for the talks are live on Youtube so go give those a listen to!.Chris Gammel gave a talk at the recent SuperCon about circuits you should add to your mental filing cabinet.Improve your circuit toolbox – Simple designs that will save your next product.Going to model the whole design to ensure proper fit.Alligator clips for signal patching are not low noise….Ground for signal input is very important – Nearly all noise is dominated by this single point.High Voltage SMPS does not like high capacitive load.Each sub circuit has its own ground return.Multiple ground system with master start.Have taken it up to nearly 60 Watts without problems.Variable Switching from 35KHz to 1000KHz.7 stages of multiplication leads to ~50V per stage.TPS40210 Switching controller into a diode/cap ladder voltage multiplier.Is there an advantage at running at higher frequencies?.Runs at 400KHz – Left open pads for boosting this up to 1.2MHz.LM311 comparator mute circuit for start up mute ~5 to 10 Seconds.Built point to point on an aluminum plate for easy modification and testing.320V phase inverter to 18V buffer drive.Drop signal using voltage dividers and mosfet buffers.
Phase inverter – create differential signals for the power amp input.Vox AC30 preamp – 3 gain stages with a cathode follower and a phase inverter.