rock soderstrom
Tour de France
I am not Ruud, but he mentioned it in this thread:Ruud, What DC-DC IC does your board use?
"EDIT 29/08; Today I looked with 'better eyes', the chips are CXW8509 and MAX1771."
I am not Ruud, but he mentioned it in this thread:Ruud, What DC-DC IC does your board use?
This of course raises the question of where to get a PE connection? An effects unit could be set up with protective insulation case, but not a tube microphone.The operation with a standard 9V DC wall wart is very tempting.
Hi RuudNL,The output voltage of the DC converter drops, so no excessive dissipation in the resistor.
I have swapped the two DC converters; the one I used for the +210V now only delivers 6.3 V and vice versa.
To my surprise this solved the problem. So it seems one DC converter had a problem.
Still it is strange that the 'faulty' DC converter delivered 210 V without a load, and did the same with a 10 mA load, but dropped the voltage when an R-C load was conneted. Well, problem solved it seems...
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