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Old 30th August 2017, 07:17 PM   #1311
peranders is offline peranders  Sweden
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Super Regulator
Pin 2 and 3 should have the same voltage within a few millivolts.

I'll suppose you use a LM329 as voltage reference?

Values for R6, R7, 1k+1K? If yes, you should get 14 V out but you must have 17 V in. What is you supply voltage?

Edit: Do you really use JRC4556? This is dual opamp, can't be used for this.
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Last edited by peranders; 30th August 2017 at 07:23 PM.
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Old 30th August 2017, 08:05 PM   #1312
jan.didden is online now jan.didden  Europe
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Originally Posted by jan.didden View Post
Well you really do need to connect those jumpers to make it work. But be aware that when you feed them 15V you won't get 15V out.
They probably need at least a volt headroom, probably more to be on the safe side.

So if you want 15V out you need to feed them 17V. Or, leave the 15V in and set the output to 13V. If you are feeding modern opamps in a preamp or filter, 13V is just fine.

Jan
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Old 1st September 2017, 05:20 PM   #1313
nuryev is offline nuryev  Australia
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Originally Posted by peranders View Post
Pin 2 and 3 should have the same voltage within a few millivolts.

I'll suppose you use a LM329 as voltage reference?

Values for R6, R7, 1k+1K? If yes, you should get 14 V out but you must have 17 V in. What is you supply voltage?

Edit: Do you really use JRC4556? This is dual opamp, can't be used for this.
Yes, as per BOM: LM329 is voltage reference and R6, R7 are 1k + 1K.

No, I just stuck the JRC4556 for test purposes, I do have the recommended AD825 but haven't sourced the adaptor.

The supply voltage is 15v-0-15v. I will need to get 18v
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Old 1st September 2017, 06:45 PM   #1314
jan.didden is online now jan.didden  Europe
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Originally Posted by nuryev View Post
Yes, as per BOM: LM329 is voltage reference and R6, R7 are 1k + 1K.

No, I just stuck the JRC4556 for test purposes, I do have the recommended AD825 but haven't sourced the adaptor.

The supply voltage is 15v-0-15v. I will need to get 18v
You could just check by temporarily paralleling the top 1k with another 1k; that should give you just above 10V. Just to check correct operation, if you are impatient. ;-)

Jan
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Old 14th September 2017, 03:22 AM   #1315
kinku is offline kinku  United States
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Hi Jan, is there any issue in using your positive supply board with nelsons B1 design ? He uses a voltage divider with Two 10K resistors to pull down the gate of jfet? Just wondering if I need to use the 15000u cap in B1 as it may cause the regulator to oscillate ?
http://www.firstwatt.com/pdf/prod_b1_man.pdf
C1 C2 and C3 and 1 ohm 3 watt resistor could be skipped in attached schematic in page 2?
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Old 14th September 2017, 07:21 AM   #1316
jan.didden is online now jan.didden  Europe
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Originally Posted by kinku View Post
Hi Jan, is there any issue in using your positive supply board with nelsons B1 design ? He uses a voltage divider with Two 10K resistors to pull down the gate of jfet? Just wondering if I need to use the 15000u cap in B1 as it may cause the regulator to oscillate ?
http://www.firstwatt.com/pdf/prod_b1_man.pdf
C1 C2 and C3 and 1 ohm 3 watt resistor could be skipped in attached schematic in page 2?
There should be no problem at all. In the B1 you should leave out both the 1 ohm R1 and the 1 15000uF cap. The superreg looks pretty much like a battery - a battery better than a real one ;-)
C2 also becomes rather useless, but maybe leave C3 for good measure, possible down to 100nF.

Jan
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Last edited by jan.didden; 14th September 2017 at 07:23 AM.
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Old 14th September 2017, 10:23 AM   #1317
kinku is offline kinku  United States
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Awesome, thanks.
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Old 14th September 2017, 12:15 PM   #1318
AndrewT is offline AndrewT  Scotland
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I would keep C2. The 15mF (or 10mF) maintains a low impedance for the bias voltage to a low frequency.
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Old 14th September 2017, 12:21 PM   #1319
jan.didden is online now jan.didden  Europe
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I would keep C2. The 15mF (or 10mF) maintains a low impedance for the bias voltage to a low frequency.
Andrew did you do the sums?
For a very clean power supply like the superreg, this is a prime example of thoughtless overkill, only serving to waste space, waste money and increasing potential RF pickup. Bad.

Jan
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Last edited by jan.didden; 14th September 2017 at 12:24 PM.
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Old 14th September 2017, 12:31 PM   #1320
AndrewT is offline AndrewT  Scotland
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I did not do any sums.

I simply looked at the schematic and saw that the resistor ladder divider uses the low impedance of C2 to provide a low impedance to the bias points of the two amplifiers.
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