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Old 25th June 2012, 06:30 AM   #1511
kokonut is offline kokonut  Germany
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Default Question about SSLV 1.1 BiB and BHL Audio JFET phono preamp kit

I want to be use the BiB for a BHL Audio JFET phono preamp kit for my MM Phono System.
The phono preamp needs a current draw less than 50 mA by 24V. I want to be using a talema 2x12 416mA (1x24V) as transformer.
What is the recomandation for c101,102,103,104.
C101 220uF,C103 47uF Elkos or
C102,C104 Wima MKS 4,7uF(or10uF) + R1 1R?.

Thanks for your help

greetz kokonut
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Old 25th June 2012, 10:47 AM   #1512
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Hi folks,

can I use 2R2 instead of 1R for the zobel filter. Then I would be able to use my favourite brand.

Best regards, Erik.
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Old 25th June 2012, 10:57 AM   #1513
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Quote:
Originally Posted by kokonut View Post
I want to be use the BiB for a BHL Audio JFET phono preamp kit for my MM Phono System.
The phono preamp needs a current draw less than 50 mA by 24V. I want to be using a talema 2x12 416mA (1x24V) as transformer.
What is the recomandation for c101,102,103,104.
C101 220uF,C103 47uF Elkos or
C102,C104 Wima MKS 4,7uF(or10uF) + R1 1R?.

Thanks for your help

greetz kokonut
Tx 1x24 is OK near 10V difference to target Vout to avoid mains fluctuation.

Prefer C302 MKT except for very sensitive digital like clocks or MC phono, if you have 10uF better than 4.7uF so C101 don't solder nothing.

For C304 also film cap better 10uF than 4.7uF so if you use film C303 don't solder nothing.
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Old 25th June 2012, 10:59 AM   #1514
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Quote:
Originally Posted by acidbrain View Post
Hi folks,

can I use 2R2 instead of 1R for the zobel filter. Then I would be able to use my favourite brand.

Best regards, Erik.
I believe no but you can parallel two 2R2 and measure if the value is 1R
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Old 25th June 2012, 01:58 PM   #1515
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by merlin el mago View Post
I believe no but you can parallel two 2R2 and measure if the value is 1R
I guess that would likely be closer to 1R1 and a simple DMM resistance measurement would, incorrectly, show 1R3-1R5
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Old 25th June 2012, 07:53 PM   #1516
kokonut is offline kokonut  Germany
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Quote:
Originally Posted by merlin el mago View Post
Tx 1x24 is OK near 10V difference to target Vout to avoid mains fluctuation.

Prefer C302 MKT except for very sensitive digital like clocks or MC phono, if you have 10uF better than 4.7uF so C101 don't solder nothing.

For C304 also film cap better 10uF than 4.7uF so if you use film C303 don't solder nothing.
Thanks for the fast info. for c104 i have also to use the 1r resistor. yes.
what will be the best choice for R303 to reach the 24V? 220R + 10k trimmer (more general) or 1k8 + 5k trimmer ?

Thanks a lot
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Old 25th June 2012, 09:29 PM   #1517
Siberia is offline Siberia  Lithuania
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Default back on track

Changed 3K3 instead of 1.8K in Vref and now can regulate my target voltage to 24V. All seems OK. With dummy connected, I've got 31VDC before the BIB onboard cap and around 30.9VDC on it. Salas tells me 6V vin-out is enough.

I get around 135mA CCS current with 10R current setting res. That should be alright as Pearl II RIAA consumption is 60mA max.

Ready to test the negative reg.

Thanks for all your help again, Salas.
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Old 25th June 2012, 10:21 PM   #1518
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Quote:
Originally Posted by kokonut View Post
Thanks for the fast info. for c104 i have also to use the 1r resistor. yes.
what will be the best choice for R303 to reach the 24V? 220R + 10k trimmer (more general) or 1k8 + 5k trimmer ?

Thanks a lot
BiB guide says 10-25V 1K8 + 5K trimmer, my advice is use 1K8 + 10K trimmer and adjust Vout to 24V once adjusted take off the trimmer & measure it so you can replace the trimmer value + 1K8 = fixed low ppm resistor
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Old 26th June 2012, 06:43 AM   #1519
kokonut is offline kokonut  Germany
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Quote:
Originally Posted by merlin el mago View Post
BiB guide says 10-25V 1K8 + 5K trimmer, my advice is use 1K8 + 10K trimmer and adjust Vout to 24V once adjusted take off the trimmer & measure it so you can replace the trimmer value + 1K8 = fixed low ppm resistor
Thanks for your info. i will do that this way
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Old 26th June 2012, 08:35 AM   #1520
AndrewT is offline AndrewT  Scotland
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A voltage reference will perform better than a resistor.
Usually a voltage reference will have a few ohms or maybe tens of ohms of dynamic impedance. A resistor must have a dynamic impedance equal to it's resistance. If you use a 1k0 resistor as your voltage Vref string then the dynamic impedance will be 1k0, If you use a 20V Zener & a 100ohm VR set to 49ohms then the dynamic impedance will be very approximately 60ohms. That is approximately 14 times lower impedance of the Vref. That makes for a better regulator, not 14 times better, but quite a bit better.

Instead of a Zener, you can use LEDs as Vref elements. Most of these Salas regulators use a short string of red LEDs just because they allow the regulator to perform better. 20V from a string of red LEDs would require 10 to 12 LEDs. That is a bit too many, a Zener would probably be better for this higher voltage.

No matter whether a resistor has a 5ppm or 50ppm or 0.5ppm tempco, it can never have a dynamic impedance as low as an appropriately selected Vref semiconductor.
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regards Andrew T.

Last edited by AndrewT; 26th June 2012 at 08:38 AM.
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