Another Jung (ALW) Supereg built – It sounds excellent - Page 6

HiFiNutNut · 12:31 AM

If I were to use a C-Multiplier, and if it does not resonate, I would still add a large low impedance capacitor, plus a 10uF film cap, plus a 0.1uF film cap, after the C-multiplier and before the JSR. In that case, at higher frequencies it betters the LM317/337 tracking pre-regulator. Yes I guess it may sound better.

By the way, if you would like to do the "film cap" mod, please don't copy the resistor values I gave earlier. As you may know that the resistors I chose are still considered not high at all for the JFET opamps. This is only because my load is OPA627 that has a solid 120dB PSSR below 100Hz, and I made the -3dB frequency a bit higher at 6.6Hz than the original 3.19Hz. If your load has lower PSSR, you should scale up the resistors more.

HiFiNutNut · 12:39 AM

analogu_sa,

The schematic you posted in #14 is the simplest opamp based shunt reg I could imagine! Is it the one called syn08? Would you mind posting the link? My guess is that the slightly more sophisticated Sala v1 would sound better. But you obviously compared that simple shunt reg with JSR, and you said that you liked both the JSR and the simple shunt.

By the way, the schematic you posted is obviously opamp based. But in your note it was MOSFET.

Regards,
Bill

Ava12 · 28th December 2009, 01:04 PM

I'm currently building two ALWSR, and have a problem, sadly I'm unable to find a thread where I can ask this question, I hope noboby minds, that I ask this here.

I use a LT1086CT with R1 and R2 @1k, which the partslist say so. Strangely I get 3,6V output on both regs. I tried 215R and that's closer to 2,5V, which I'm trying to achieve.
Maybe the solution is really a stupid mistake of mine, but I'm still learning.
My source is a 9V wallwart.
Could anybody help, I'm really stuck.
Greetings Ava

ikoflexer · 28th December 2009, 04:39 PM

Why don't you open a thread in the power supplies section, asking the questions. I would recommend that you post the schematic, or link to it, and some measurements at important points.

Until then, check that it doesn't oscillate. If you don't have an oscilloscope try listening to a radio set on AM. Bring it close to your regulator and search for noise that gets larger as you get nearer the regulator.

8th October 2009, 12:23 AM	#51
HiFiNutNut diyAudio Member Join Date: May 2004 Location: Sydney	If I were to use a C-Multiplier, and if it does not resonate, I would still add a large low impedance capacitor, plus a 10uF film cap, plus a 0.1uF film cap, after the C-multiplier and before the JSR. In that case, at higher frequencies it betters the LM317/337 tracking pre-regulator. Yes I guess it may sound better. By the way, if you would like to do the "film cap" mod, please don't copy the resistor values I gave earlier. As you may know that the resistors I chose are still considered not high at all for the JFET opamps. This is only because my load is OPA627 that has a solid 120dB PSSR below 100Hz, and I made the -3dB frequency a bit higher at 6.6Hz than the original 3.19Hz. If your load has lower PSSR, you should scale up the resistors more. Last edited by HiFiNutNut; 8th October 2009 at 12:31 AM.

8th October 2009, 12:30 AM	#52
HiFiNutNut diyAudio Member Join Date: May 2004 Location: Sydney	analogu_sa, The schematic you posted in #14 is the simplest opamp based shunt reg I could imagine! Is it the one called syn08? Would you mind posting the link? My guess is that the slightly more sophisticated Sala v1 would sound better. But you obviously compared that simple shunt reg with JSR, and you said that you liked both the JSR and the simple shunt. By the way, the schematic you posted is obviously opamp based. But in your note it was MOSFET. Regards, Bill Last edited by HiFiNutNut; 8th October 2009 at 12:39 AM.

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28th December 2009, 01:04 PM	#53
Ava12 diyAudio Member Join Date: Apr 2008 Location: Darmstadt	I'm currently building two ALWSR, and have a problem, sadly I'm unable to find a thread where I can ask this question, I hope noboby minds, that I ask this here. I use a LT1086CT with R1 and R2 @1k, which the partslist say so. Strangely I get 3,6V output on both regs. I tried 215R and that's closer to 2,5V, which I'm trying to achieve. Maybe the solution is really a stupid mistake of mine, but I'm still learning. My source is a 9V wallwart. Could anybody help, I'm really stuck. Greetings Ava

28th December 2009, 04:39 PM	#54
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	Why don't you open a thread in the power supplies section, asking the questions. I would recommend that you post the schematic, or link to it, and some measurements at important points. Until then, check that it doesn't oscillate. If you don't have an oscilloscope try listening to a radio set on AM. Bring it close to your regulator and search for noise that gets larger as you get nearer the regulator.

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