I have built 20 positive and 20 negative Borbely shunts, they are stable.
The output C15, 16 are 100uf and C 17, 18 is 0.1 polypropelene film bypass, if any problems don’t use low ESR cap and maybe leave off the 0.1 uf film. I didn’t use film cap because I used Blackgate FK electrolytic
C11, C12 C is 220 pf silver mica for the driver.
D1, D2 is Semitec E102
D3, D4 Is Semitec E202 or 1.5 k resistor
The output C15, 16 are 100uf and C 17, 18 is 0.1 polypropelene film bypass, if any problems don’t use low ESR cap and maybe leave off the 0.1 uf film. I didn’t use film cap because I used Blackgate FK electrolytic
C11, C12 C is 220 pf silver mica for the driver.
D1, D2 is Semitec E102
D3, D4 Is Semitec E202 or 1.5 k resistor
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.. as in your picture of post 8 ?
I can confirm that shunts like this are not particularly prone to oscillation.
I can confirm that shunts like this are not particularly prone to oscillation.
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Did You ask me?
I design the schematic, sim it with LTSpice. My friend made pcb layout. We share it at local audio community.
It is similar to that of Borbely it seems.
Not sure when and where Borbely 906-255 was published for the first time,
however the Waagbo article of AudioXpress 2-2008 is not original but in many
aspects a rip off from an earlier one in Audio Amateur Magazine, predecessor
of AX.
Not sure when and where Borbely 906-255 was published for the first time,
however the Waagbo article of AudioXpress 2-2008 is not original but in many
aspects a rip off from an earlier one in Audio Amateur Magazine, predecessor
of AX.
The 2008 article was probably the first time I saw Erno's shunt regulator. I bought many kits from Erno, but then he stopped selling.
Jim's Audio on eBay sells a similar shunt regulator board. He gives a parts list if you buy it, I think all the resistors are same as Erno's, but he has a few semiconductor substitutions. I used this board from Jim's Audio and built a number of Erno's super shunts with it, it works just fine. I had the original semiconductors so I can't say if the substitutions work or how they sound. They also have a BJT shunt regulator, but I never bought or built it
Borbely all FET low-noise super shunt regulator PCB one piece - JIMS Audio
Jim's Audio on eBay sells a similar shunt regulator board. He gives a parts list if you buy it, I think all the resistors are same as Erno's, but he has a few semiconductor substitutions. I used this board from Jim's Audio and built a number of Erno's super shunts with it, it works just fine. I had the original semiconductors so I can't say if the substitutions work or how they sound. They also have a BJT shunt regulator, but I never bought or built it
Borbely all FET low-noise super shunt regulator PCB one piece - JIMS Audio
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Yes it is. But I use BJT, instead of JFET. I do not know the value of resistors and capacitors in Borbely version. In simulation it worked. It have good PSRR, low noise, good transient response, etc.
I need to look to be sure, its been a while since I built them. But 99% sure its 220 pf. I got the first kits directly from Erno.
Yes it was 33pf on the Millennium 200 amplifier's series regulator. (this cap isn't on the pc board or parts list, but it was a later note I got from Les Bordleon who bought the license to continue some of Erno's designs.
Yes it was 33pf on the Millennium 200 amplifier's series regulator. (this cap isn't on the pc board or parts list, but it was a later note I got from Les Bordleon who bought the license to continue some of Erno's designs.
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I did it in 5V shunt regulator, but I do not share it. The constant current source still use mosfet. It tested.
there is a 5 volt version of the Borbely shunt.
it used a bipolar differential pair (no cascode theres not enough voltage), a 2,5 volt reference (Walt Jung's Gled is a great 2.5V reference but need 8-9 ma for lowest noise, current source a 9 ma idss 2SK170), and 2013/313 fets as the current sources and shunts
it used a bipolar differential pair (no cascode theres not enough voltage), a 2,5 volt reference (Walt Jung's Gled is a great 2.5V reference but need 8-9 ma for lowest noise, current source a 9 ma idss 2SK170), and 2013/313 fets as the current sources and shunts
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Thank you for this. Surely it will work fine (what do you need a 5 V shunt for?).
I thought Tick wanted to share the 5 V Borbely version.
I thought Tick wanted to share the 5 V Borbely version.
5 volt shunt = dac d/a converter chips
Borbely dac 8 x BB 1704 K - 300 ma +/- 5 VDC
The Jung Gled uses Zetex transistor with very low rbb for low noise, BC 237 and BC 337 are not as low. the current mirror in Bimo’s shunt is interesting
Borbely dac 8 x BB 1704 K - 300 ma +/- 5 VDC
The Jung Gled uses Zetex transistor with very low rbb for low noise, BC 237 and BC 337 are not as low. the current mirror in Bimo’s shunt is interesting
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