Simplistic Mosfet HV Shunt Regs

[dadedady]

Here is my SSHV2. Row pcu, heater psu and SSHV2 all in one pcb 10x15 cm, including the sinks.
I made some changes in layout of SSHV2, to use the same sink for IRF840 and DN2540. I replaced 2sk117GR and KSA1381 whith 2SK170 and mje350, and I used 10u/450V electrolytic. I used 4 uf4007 rectifiers and 4 // 47n/680V, and after that RC filter (2 100u/400V electr., 2 1u /400V MKT, 1 10u/400V electr. and 2 resistors)
The in + raw is 298V. After power on I turned R4 and R11 for 30mA and 240V, then I conected my preamplifier and power on again.
The reading started from 235V, then rised slowly to 245V (in about 15 minutes) and then stay steady as rock for about 2 hours I lisened to music. I tried that next day and once again for more than 2 hours. The readig was the same as the first time. The sink was just warm. I hear no hum, buzz and other noise at all.
The sound was very clear and detailed for for bass, mind and high.
I love SSHV2. You can use it as variable psu
The only I have to say is congratulation Salas
I tried to attach two pictures but Iwas waiting for more than 1 hour and nothing. Perhaps tomorow I' be more lucky

[Salas]

That's nice. Congratulations. With K117 could drift less but its still OK since you just got K170. At least it stays put after the warm up drift. Weird you could not attach. Maybe they were too big?

[dadedady]

The picture was to big. Now is OK

[Salas]

And are those sinks to the right the heater's supply on same pcb? Better twist each sense and force pair of cables, makes for a tighter loop area.

[dadedady]

Yes, the sinks to the right are for heaters. I'll twist the cables and all arangments when I finish the test. The SSHV2 is conected to pream. and as I mentioned no hum or other type of noise. It's quiet as dead.

[Salas]

Could you hear more detail and dimension in music from what you used for B+ filtering/reg before? What was that, and on what kind of preamp you tested?

[dadedady]

Allthough I'm not so good in listening, I think I hear more detail in music. I used a TL783 as +B that works like a LM317 and simple RC filtering. My pream. is a tube pr. whith 2 6n3, but I'll test whith an other tube 6n1. http://diyaudioprojects.com/Tubes/EC...e-SRPP-Preamp/

[rclourenco]

Originally Posted by Salas

With lower Vref resistors. Make them half.

Hi Salas,

You mean R11 and R12?

Thanks

[Salas]

The ones in series under the led if you talk SSHV2. But SSHV1 CCS can give much more current if you are looking for some solid state 85V application to cater for.

[Salas]

Originally Posted by dadedady

Allthough I'm not so good in listening, I think I hear more detail in music. I used a TL783 as +B that works like a LM317 and simple RC filtering. My pream. is a tube pr. whith 2 6n3, but I'll test whith an other tube 6n1. DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamplifier

TL783 is 125V max. You floated it I suppose for the B+ of that SRPP.