I have multiple projects in the queue. Years worth. I've been writing down my crazy ideas over the years, I just didn't have time to bring most of them to light. Now that I'm retired, the risk now is getting "squirrelled." Someone asking about fun future work and me putting aside a current project to answer them which delays both of the projects from getting done.
First in the queue is that I'm wanting to get my magnetics design notes online just in case I don't beat the "Boeing Curve." I want to get the copy of derivation if the (LI)^2/DCR equation for inductor design published (with permission) and then post an excel spread sheet to calculate EI-Core inductors using that equation. This spreadsheet is up and running and will also work for transformers too. Just set the fill factor to 0.45 instead of 0.9. One thing that is great about this tool is you can pick your primary DC resistance so you can see what it costs to improve your damping factor. There is a caution: Like with all design spreadsheets, you can try to "over optimize" something and totally hose it up or push something past the parameters in a material's or process's "un-written datasheet".
I've already added a load line calculator for paralleled tubes that also works for a single tube (set # tubes in parallel = 1). MilliVolt wrote the first version for a school project. (My programming expertise was with Basic and Fortran, MilliVolt can write JavaScript.) I added the load line plot on my own using Google for the programming guidance. MilliVolt helped a little, but insisted that Dad figure it out for himself. It was frustrating for what worked to pass variables between JavaScript chunks for MilliVolt, wouldn't work for the chart plotting script. Don't you just hate it when your child feeds the "Teach a man to fish and you feed him for life" back at you! Paybacks are hell.
https://www.voltsecond.com/Calculators/Parallel_tube_Load_Line/parTubeCalc.htmlI'm wanting to get an array of 600V power supply projects published. I've already posted the "Discharginator" that will discharge the 600V automatically when the power is turned off. I've used fancier versions of this at work, but this is completely divorced from the ones I used at work. I have a 14 second long primary side HV soft start nearly laid out and then I get the news that Express PCB is sunsetting "PCB Classic." (Ouch!) However, I need to finish my 600V power supply tester first before I build the delay. I'm debating if I want to learn Ki-Cad to do it. Why 600V? I want to build what I call a "Demi-CSS" that is 1/2 way between a SRPP feed and a CCS for a power tube. It will need a bit more than 500V to run a 2A3. There was a sentence and a sketch about this topology in TubeCad with small signal tubes a long time ago, but it was never named or made into a full article, so I want to christen it the 1/2 CCS or Demi-CSS so it sounds fancier.
https://www.voltsecond.com/VoltSecond_New/Dischargeinator_files/DisChargeInator.htmlMy alter ego Amp-Second has a few headphone projects to publish. I have one targeted for low Z headphones that runs from 4 AA batteries that works great, it just has a very nasty turn off thump if you don't use matched batteries and you forget to turn it off. If you use the power switch there is no problem. The Math says I should get almost 90 hours from 4 rechargeable AAs. I've done over 40hrs off the batteries at work with Ver 2 so the math is at least 1/2 right. Mrs. Volt even hears the difference between it and from plugging directly into a phone. Version 3, that should fix the turn off thump, is on the ESD mat waiting for for a couple of good eyesight days to do the soldering of the SMT parts.
-Volt
