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Old 20th November 2012, 01:24 PM   #61
klewis is offline klewis  United States
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some update results on the SSR-02. I increased in input supply voltage to -12v and got it running correctly. I had built it for -5v but, for some reason, I'm getting -8.18v out. (will work this out with Peranders) With the increased input voltage, the led lit up and all seems good. The new 0 to 2k plot is vastly improved. Note the vertical scale is now 1uVrms, prior plot was 100uVrms.

Ken
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Old 12th December 2012, 01:22 AM   #62
klewis is offline klewis  United States
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I built the Jung Shunt Regulator posted in AudioXpress. I built it as shown in the schematics and following the layout tips in the original articles - except for the opamp which is an LME49710 (had a few on hand). The measurement results are powered from the same lab bench supply as the Sjostrom regulator in the prior post. One note, it is a bit sensitive to supply voltage, if input voltage is to high the output voltage decreases. Seemed to like the range between 19 to 21 volts in about for 15.77 vout. Above 21 volts the output drops - at 22 volts in output is 10.3v. It also takes 5 seconds or so to come up to a stable voltage.
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Old 12th December 2012, 08:45 AM   #63
AndrewT is offline AndrewT  Scotland
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Once again the 3rd harmonic (180Hz for a 60Hz supply) is the worst.
Why?
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regards Andrew T.
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Old 12th December 2012, 03:54 PM   #64
klewis is offline klewis  United States
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I have a commom mode choke prior to the regulator, maybe that eliminates the 1st and 2nd, or the lab supply it is being fed from makes big 3rds. I measure and post the spectrum from the lab supply.
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Old 13th December 2012, 07:45 PM   #65
klewis is offline klewis  United States
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Quote:
Originally Posted by AndrewT View Post
Once again the 3rd harmonic (180Hz for a 60Hz supply) is the worst.
Why?
Andrew,
Here is the lab supply output, note change of scale.
Ken
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