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Old 3rd March 2006, 03:13 PM   #1
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Default Modifying Jung Regulator For 5V Output

Hello All,

I currently have a Jung Regulator PCB made by AOS. Is it possible to modify it to output 5V without significantly altering the board? In the schematic (here: http://www.aoselectronics.com/gfx/jsr/jung_pos.gif), you can see that the reference voltage is 6.9V, so that clearly would have to be dropped below 5V for a 5V output. Any ideas?

Thanks,
Bryan
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Old 3rd March 2006, 03:15 PM   #2
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Lightbulb Re: Modifying Jung Regulator For 5V Output

Quote:
Originally posted by bryman79
Hello All,

I currently have a Jung Regulator PCB made by AOS. Is it possible to modify it to output 5V without significantly altering the board? In the schematic (here: http://www.aoselectronics.com/gfx/jsr/jung_pos.gif), you can see that the reference voltage is 6.9V, so that clearly would have to be dropped below 5V for a 5V output. Any ideas?

Thanks,
Bryan
Other reference?

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Old 3rd March 2006, 03:37 PM   #3
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Any hints on a substitute reference that would equal the LM329 in performance? I see that some use the TL431... has anyone measured the noise at the output vs. the LM329?

Thanks,
Bryan
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Old 3rd March 2006, 04:18 PM   #4
GaryB is offline GaryB  United States
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Bryan,
Try an LM385-2.5v. Its a good quality reference thats available in voltage ranges appropriate for a 5v regulator.
---Gary
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Old 4th March 2006, 07:20 AM   #5
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Gary,

Will substituting the LM385 require any other part changes (e.g., the 4.99k resistor)?

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Bryan
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Old 12th March 2006, 03:05 PM   #6
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I've since run across ALW's pdf article that suggests using the LM336Z-2.5 and the AD817. I've emailed him, but no response. As such, I have two questions:

1. Why the change from AD825 to AD817? I've heard that both will operate at voltages below 5V...

2. Anyone have experience (listening or measuring) with the LM336Z-2.5 vs. the LM385-2.5?

Thanks,
Bryan
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Old 12th March 2006, 04:08 PM   #7
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I have tested with AD825 at 5 volts, even down to 3.1 volt and this is under the specs but it worked.

As reference a LM431 will work and surely many other references at 2.5 volts.
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Old 12th March 2006, 04:18 PM   #8
moamps is offline moamps  Croatia
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5 volt version of the Updated super regulator.
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Old 2nd April 2006, 06:18 AM   #9
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Old 2nd April 2006, 08:57 AM   #10
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Lightbulb 5 V reference

You can use a 5V reference with a gain of 1 amplifier. In other words the regulator must have unity gain then.
LT1021-5, MAX6250, AD586, REF02.
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