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Old 23rd June 2014, 07:27 AM   #281
Corpius is offline Corpius  Netherlands
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I included the formula in my Bill Of Materials. That way I could just fill in the needed output voltage and the value of one of the resistors and other resistor value will be calculated automatically.
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Old 23rd June 2014, 08:10 AM   #282
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Good idea! But be aware that, depending on the output voltage range, other changes may be required.
For instance, with a 6.9V ref, the Vout can never be below 6.9V (and that is when one of the resistors is zero).

So for a 5V Vout you should change to a lower ref. Ideally, the ref should be around half Vout, so an LM4040-2.5 would be good for 5V.

Also the zener in series with the output of the opamp which is required to get that output at around half Vout might also be needed to be adapted.

Finally, make sure the opamp can run from the Vout - not all opamps work on 5V for instance.

Jan
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Old 23rd June 2014, 10:03 AM   #283
Corpius is offline Corpius  Netherlands
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The excel formula also includes the ref voltage, but it does not check if the desired output voltage is the same or higher as the ref voltage. This can easily be added to the formula of course. I will post the Excel file (BOM) when I get home, so it can be used by anyone who thinks that it's useful.
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Old 23rd June 2014, 10:25 AM   #284
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by jan.didden View Post
Ideally, the ref should be around half Vout, so an LM4040-2.5 would be good for 5V.

Also the zener in series with the output of the opamp which is required to get that output at around half Vout might also be needed to be adapted.
Ah, missed that in my 24 Volt 'BA3 as a pre build'. Should I replace the zeners and references for around 12 Volt ? It is working properly now.
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Old 9th July 2014, 07:34 AM   #285
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Default Sorry to butt in, but

I have inherited 3 super reg boards set for 15v.

Will adjusting the trim pot allow me to "up" the voltage to 20v or higher?

Sorry for disrupting thread with kindergarten level question.

Hope you can help, I would like to adapt them to use with Juma Preamp for my F5
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Old 9th July 2014, 01:27 PM   #286
WalterW is offline WalterW  Netherlands
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Depends on what value of trim pot is on the board. Normally there is no trim pot. Can you read the value on the trim pot? Otherwise just try :-)
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Old 9th July 2014, 01:55 PM   #287
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I am building a phono stage using a one regulator per channel. I am at the point where i have to decide whether to feed these two regs with dual psu's or a single. What advantages are to be had from a "true" dual mono setup and how distinguishable wold you predict it to be.
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Old 13th July 2014, 12:17 AM   #288
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Quick question about an issue i am having. When i power the regulator on the LEd lights up, but then turns off. I get the full supplied voltage on the output of the reg. The other channel appears to be working perfectly. I haev used the original version of the circuit with the LM317 as a prereg. It would appear that the LED is fine and the with power off, the pass transistor measures the same when checked against the good channel. I would assume the opamp, but both were fired up at the same time and evrything has been triple checked in terms of soldering.
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Old 13th July 2014, 08:00 AM   #289
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What is the voltage at the opamp inputs and its output?
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Old 13th July 2014, 10:29 AM   #290
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11V on the input. 51V on the output.
LM329 cooked?
While the other channel is providing the proper output voltage, I suspect it is oscillating, as the led flickers rapidly as the power is turned off. got a scope, but was hoping it would be a trouble free build. Oh well. Know how that goes.
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