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Old 11th June 2009, 09:10 AM   #431
Tham is offline Tham  Malaysia
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You are right. I just turn it the other way and I get 24.7VDC. Many thanks for the help.

Rgds
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Old 11th June 2009, 09:13 AM   #432
Salas is offline Salas  Greece
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If you listen to it, and have photos too, let us know. What you want to power with it?
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Old 11th June 2009, 12:23 PM   #433
Tham is offline Tham  Malaysia
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Built a Le Pacific MM RIAA clone and was thinking of powering it with your V1 shunt regulator design.

Will post photo once it is working.
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Old 11th June 2009, 03:08 PM   #434
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better you mod Le Pacific in Salas phono !!
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Old 11th June 2009, 03:13 PM   #435
jam is offline jam  United States
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Salas,

Have you measured the noise performance
of the various versions of the regulator?

Jam
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Old 11th June 2009, 03:25 PM   #436
Salas is offline Salas  Greece
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My scope just showed straight lines indistinguishable in thickness from its GND reference line.
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Old 11th June 2009, 03:33 PM   #437
Salas is offline Salas  Greece
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P.S. James has made various V1s for current and Voltage, feeding his headphone amp (about half an Amp CCS), his lightspeed etc. He is chuffed as he wrote me and plans to give to Than for detailed examination that has access to some lab.
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Old 11th June 2009, 03:35 PM   #438
jam is offline jam  United States
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Salas,

I built a version of V1 and it was very quiet, I thought that the zener would compromise the noise performance buy apparently not. Same results with my scope.

Thanks,
Jam
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Old 11th June 2009, 03:39 PM   #439
Salas is offline Salas  Greece
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If you up the Zener bypass cap to 1000uF, it will guard even better against its residual noise in case it is not the best Zener you could find. I had once some plastic cased 36V ones that upped the noise floor of the phono on FFT. 1000uF did better on them, but not better than the 100uF on the 1NXXXXA glass encapsulated ones. So I changed them.

Did you listen to it too? What you power?
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Old 11th June 2009, 04:28 PM   #440
jam is offline jam  United States
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Salas,

I have built several shunts before and I can honestly say that your design is one of the best if not the best that I have heard.
I only ran about 150ma through it and the current source was a bipolar with a led reference that was fed by a jfet current source.I like this better than the two transistor current source by a small amount. For higher currents the fet current is probably better.

I hear that temperature compensated zeners that are used in aerospace applications are quiter but they cost between $35 and $50 and have to be specially ordered. Talking to one of the engineers at the plant he let me know that a temp. compensated zener was made up of a zener and some reversed biased diodes in series.

Sonically your v1 sounds the most natural in the midrange and seems to have a nice balance to the sound and before I forget ,it is very quiet. I prefer it to any series regulator I have tried. Increasing the loop gain seems to improve the bass and extreme high end ( by a small amount) but at the expense of the midrange (not so good).

What brand of Zeners do you use?

Regards,

Jam

P.S. Sorry no pictures.
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