The simplistic Salas low voltage shunt regulator - Page 51 - diyAudio
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Old 15th June 2009, 07:56 AM   #501
Salas is offline Salas  Greece
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Quote:
Originally posted by staggerlee



James/Salas,

First off the layout of this board is stunningly elegant. Just fantastic! Is this compatible with the schematic in post 1, which I believe is V1 with the R6 Mod?

Click the image to open in full size.
This one has R6 mod and is compatible.
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Old 15th June 2009, 11:45 AM   #502
iko is offline iko  Canada
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Quote:
Originally posted by Tham
Hi Iko,

Will try the version in post #456...for18Vdc output, do I change both the zeners to 18V diode? Any other changes need to be made?

For 18V output use a 10V and an 8V or two 9V. What is the load? According to the load you may want to change the 6R9 resistor. I used yellow LEDs with about 1.8V drop each, the least noisy I could find. Tell me more about the expected load current/circuit.
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Old 15th June 2009, 12:48 PM   #503
Tham is offline Tham  Malaysia
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Hi Iko,

I am planning to use it to power a B1. Output can be 18 - 24VDC.
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Old 15th June 2009, 01:01 PM   #504
Salas is offline Salas  Greece
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The DC input filter arrangements of normal B1 may compromise it. See to bypass them. It has 1 Ohm R1 in series. Here it kills your shunt's super low output impedance. Then it has C1,C2,C3. There it kills your shunt's bandwidth on 15.000uF of electrolytic and its ESR per divider's side. As it is, it is made to filter noise from wall wart psu's.
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Old 15th June 2009, 01:26 PM   #505
Tham is offline Tham  Malaysia
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Hi Salas,

Any suggestion how to implement it with a normal B1? I have one already built with small (1000uF) filter caps.

Would this shunt regulator work better with your B1 design without output cap?
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Old 15th June 2009, 01:41 PM   #506
Salas is offline Salas  Greece
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For normal B1, and to retain Iko's cascode and buffer version's benefits, delete R1, C1, C2.
If you have an input capacitor in your power amplifier or it has DC fault protection, there is a symmetric B1 with incorporated +/- shunts there.

Click the image to open in full size.
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Old 15th June 2009, 01:43 PM   #507
Tham is offline Tham  Malaysia
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Hi Salas,

Can I connect the shunt output (18 or 24VDC) directly to the voltage divider of the normal B1 and remove altogether R1, C1, C2, & C3?

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Old 15th June 2009, 01:46 PM   #508
Tham is offline Tham  Malaysia
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Sorry Salas, I am typing too fast...Thanks for the advice.
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Old 15th June 2009, 01:47 PM   #509
Salas is offline Salas  Greece
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Quote:
Originally posted by Tham
Hi Salas,

Can I connect the shunt output (18 or 24VDC) directly to the voltage divider of the normal B1 and remove altogether R1, C1, C2, & C3?

Of course. That is what we are talking about.

P.S. How is your phono sound going on? Your shunt must have burned in and be mellower by now. You promised some pictures also.
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Old 15th June 2009, 01:47 PM   #510
iko is offline iko  Canada
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Quote:
Originally posted by Tham
Hi Iko,

I am planning to use it to power a B1. Output can be 18 - 24VDC.
After you rectify and filter the input voltage, what does it measure to? What comes out of the transformer?

Honestly, for B1 I would use the v1 regulator. B1 barely draws any current. And definitely I second salas' point about the 1R input resistor, I would not use it with the shunt.
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