You need 200V out, and 15ma, I think a lite! im sure you use tube 12ax or 6h6!
yes or no??
You see here: http://www.diyaudio.com/forums/power-supplies/134801-simplistic-mosfet-hv-shunt-regs.html
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At the moment, there are two E813CC TechTube but i have also some 6N2P-ER and e83CC Tesla.
The PSU stage in the DAC looks like this:
The PSU stage in the DAC looks like this:
An externally hosted image should be here but it was not working when we last tested it.
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Right, 4XSF4007 --> 47μF --> LL1638 (dual serial connection) --> 2X100μF
All are M-Tcaps.
Now i changed to thicker wires and re-orientated parts to further reduce cable lengths.
Of course for another time is sounds different.
After some listening and evaluation, i will terminate grounds not near the reg, but near the audio board.
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quanghao,
no audible noise and hum anyway, even without regulators. I am using Salas regs for their influence on the sound.
Here is the schematic of my pre. Changed output tubes to PCC88, 47μF electros to film, reduced output caps to 15μF and removed 300Ω output resistor.
dvb-projekt,
are you asking me, because i cannot understand the question.
no audible noise and hum anyway, even without regulators. I am using Salas regs for their influence on the sound.
Here is the schematic of my pre. Changed output tubes to PCC88, 47μF electros to film, reduced output caps to 15μF and removed 300Ω output resistor.
dvb-projekt,
are you asking me, because i cannot understand the question.
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Very nice work. Merry Xmas!Is the R from Selectronic?
Hi Salas,
You mean R on the board?
Merry Xmas to you too and everybody reading
Since you can listen to the cable length difference you may experiment with remote sensing at a point. I.e. using 4 output wires. There are opportunities for oscillation regarding those as well, must twist or use shielded coax for the sensing pair (the pair that closes circuit for the Vref and drive). The cool part is that allows longer wiring without feeling the load nodes moving away. Drops the output wiring influences to a significant extent. Here is an example of wiring like that.
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This is the original chineese R-core i was using with the tube power supply. I now using this just for the 7V filament of PCC88.
Thank you for the remote sense circuit.
I can understand that the remote sense pair will be the one near 2SK170 and MJE350, right?
I think that i have to rebuild the whole reg, because maybe it will be more difficult to modify Disco's board to do this.
Right. The main pair should remain as thick as originally for 2 wires. The sense pair is good to be as thick too, but if just twisted presents some oscillation (can see with a scope, or be aware of subjective roughness showing up), you can try shielded coax. Remote sensing works generally, now I can't be sure for your build, but it is worthy to try out. Don't forget that without the 4 wires meeting at their load ends, the circuit isn't complete for testing.
This is indeed a very interesting approach. Can it be implemented for 400 V 200mA ?
Best Regards,
Davide
Best Regards,
Davide
You would need a 400V PNP driver transistor, larger R4. Also caution, clamping around with Zeners. Surely difficulties with heat. DN2540 TO-220 depletion I would use for CCS in such a case, would cross my fingers and try.😉
I don't know about layout, I do point to point. But I know that DiyAudio.com does not make boards, so you surely must take that line out.
