Of course, I meant +200V, not +300V! On Sunday, April 2, 2017 at 1:58:40 PM UTC-4, Paul Andrews wrote: > > Next installment. First I tried the current mirror with 2K resistors > between +300V and the emitters. This works fine, but is also no more stable > than the first solution. It presumably also wastes more power as R2 has to > be higher - it is setting the current, so I chose 100K here to get 2mA: > > > <https://lh3.googleusercontent.com/-jZxqDiexrus/WOE53m-lGiI/AAAAAAAAAic/jUVDBH1pLhMrDElle_f30WLp2QJZCw3IwCLcB/s1600/CMF.JPG> > > Next I tried the current limiter as described in several places, but in > particular here > <http://electronicdesign.com/power/current-limiter-offers-circuit-protection-low-voltage-drop>as > > suggested by Tomasz. I used an Rsense (R3) of 330 Ohms as I wanted 2mA. > This was not successful. With test loads it delivers <2mA (or exactly 2mA > for a short circuit!). So I tried a 6844A nixie (which is what started off > this whole current source thing). It delivered approx 0.5mA, so the tube > barely lit. > > > <https://lh3.googleusercontent.com/-DzPAZS8OZN8/WOE63Kl33WI/AAAAAAAAAio/l24DP892H8QI40j-AlBtayGszcil7W1RgCLcB/s1600/CL.JPG> > > > >
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