Simplistic Mosfet HV Shunt Regs - Page 51

Ryssen · 29th August 2009, 05:49 AM

2 driver tubes at 20mA each total of 40ma.That would be 6,8w double the current 80mA=13,6w.

Salas · 29th August 2009, 11:41 AM

The CCS Mosfet can take up to 200V across it. Haven't used such a Vin - Vout though. You are talking 170V at 80mA through it. I would at least clamp it with a 190V 5W Zener across and 12V 0.25W Zener from G to S, as well as the output one from S to G, directly on the pins. All Zener cathodes looking up as we view the schematic. Because a small transient would kill easily at such margins. R1=33R at 170Vdiff for 80mA. On the other hand, why not kill some voltage on a series of RC filter stages, so to get the dif down to 70V and benefit by pre smoothing the reg's final Vin a lot?

Ryssen · 29th August 2009, 11:56 AM

Ok,thanks.

Stixx · 29th August 2009, 12:42 PM

I eventually got the headphone amplifier breadboarded that my first HV shunt was intended for. As a reminder: SE spud using D3A, C3G or E810F (playing right now), vintage Saba opt's and so on...
For testing I initally used a Maida reg at 145V since the Salas' shunt is a bit more ...err... sensitive to prying around with probes, disconnecting and connecting and such

The sonic result wasn't exactly overwhelming (even after burn in) so I put the shunt regulator to use.

and

to Salas again! Don't want to repeat myself too often, but what a difference! The shunt is playing at 75mA for about 42mA consumption at 142V (the lower limit of the trimpot) and beats the Maida by a very comfortable margin... Open, sweet, subtle and authentic... very nice!

nicoch58 · 29th August 2009, 01:23 PM

well done !!

Ps don't use mdf is carcinogen.....

Salas · 29th August 2009, 03:04 PM

Quote:

Originally Posted by Stixx

I eventually got the headphone amplifier breadboarded that my first HV shunt was intended for. As a reminder: SE spud using D3A, C3G or E810F (playing right now), vintage Saba opt's and so on...
For testing I initally used a Maida reg at 145V since the Salas' shunt is a bit more ...err... sensitive to prying around with probes, disconnecting and connecting and such

The sonic result wasn't exactly overwhelming (even after burn in) so I put the shunt regulator to use.

and

to Salas again! Don't want to repeat myself too often, but what a difference! The shunt is playing at 75mA for about 42mA consumption at 142V (the lower limit of the trimpot) and beats the Maida by a very comfortable margin... Open, sweet, subtle and authentic... very nice!

Good to know it has served you well in several occasions. Happy listening.

disco · 8th September 2009, 04:45 PM

Still waiting for those A94 to arrive...

Nice bottles you use for the headphones Stixx.
Is the schematic on line?

Stixx · 8th September 2009, 07:10 PM

Those bottles

are 6D22s halfwave rectifiers... the rest is a very straightforward single tube SE-schematic.
The schematic is now online

, shown with the D3A though.. Also bias is now with an orange LED at around 21mA for the E810F.
Not sure about this tube yet, also i am still having a tiny bit of hum on one channel probably due to wiring...
Next in line is C3G which I am using successfully in another headphone amplifier.

Ryssen · 8th September 2009, 07:54 PM

Do you have a picture with higher resolution?

Stixx · 9th September 2009, 08:11 AM

I should be readable when you fully enlarge it (first zoom it and than extend in lower left corner).

29th August 2009, 05:49 AM	#501
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	2 driver tubes at 20mA each total of 40ma.That would be 6,8w double the current 80mA=13,6w. __________________ Regards Åke

29th August 2009, 11:56 AM	#503
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Ok,thanks. __________________ Regards Åke

8th September 2009, 04:45 PM	#507
disco diyAudio Member Join Date: Apr 2006 Location: Holland	Still waiting for those A94 to arrive... Nice bottles you use for the headphones Stixx. Is the schematic on line? __________________ jaap

8th September 2009, 07:54 PM	#509
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Do you have a picture with higher resolution? __________________ Regards Åke

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29th August 2009, 11:41 AM	#502
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The CCS Mosfet can take up to 200V across it. Haven't used such a Vin - Vout though. You are talking 170V at 80mA through it. I would at least clamp it with a 190V 5W Zener across and 12V 0.25W Zener from G to S, as well as the output one from S to G, directly on the pins. All Zener cathodes looking up as we view the schematic. Because a small transient would kill easily at such margins. R1=33R at 170Vdiff for 80mA. On the other hand, why not kill some voltage on a series of RC filter stages, so to get the dif down to 70V and benefit by pre smoothing the reg's final Vin a lot?

29th August 2009, 01:23 PM	#505
nicoch58 diyAudio Member Join Date: Oct 2004	well done !! Ps don't use mdf is carcinogen.....

9th September 2009, 08:11 AM	#510
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	I should be readable when you fully enlarge it (first zoom it and than extend in lower left corner).

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