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Old 23rd June 2012, 01:14 PM   #1501
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by merlin el mago View Post
I compared a trimmer vs a low ppm Vref resistor.

How do you say "Balderdash !!"
However if you use a 300ppm VR instead of Vref device then expect anything to happen to output voltage.
Understand how the regulator works and give it a chance to work properly.

The idea of using a VR as the sole device in the Vref string is defeating the whole SALAS reg philosophy.
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Old 23rd June 2012, 01:29 PM   #1502
merlin el mago is offline merlin el mago
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AndrewT I don't want to discuss with you I know we hear AC but don't forget all is DC powered.

I understand also semis have tempco & surely affects more to the reg.

I know Salas philosophy and I know LEDs are less noisy than resistors.

Still don't answered how do you say: "Balderdash"
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Old 24th June 2012, 01:18 AM   #1503
alazira is offline alazira  United States
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Quote:
Originally Posted by merlin el mago View Post
AndrewT I don't want to discuss with you I know we hear AC but don't forget all is DC powered.

I understand also semis have tempco & surely affects more to the reg.

I know Salas philosophy and I know LEDs are less noisy than resistors.

Still don't answered how do you say: "Balderdash"
"Balderdash" is just a colorful way of saying "Poppycock" , at least as far as low tempco resistors goes according to his analysis.
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Old 24th June 2012, 08:16 AM   #1504
AndrewT is offline AndrewT  Scotland
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In a regulator passing constant !!!
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Old 24th June 2012, 08:51 AM   #1505
samoloko is offline samoloko  Bulgaria
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Quote:
Originally Posted by merlin el mago View Post
You aren't alone: welcome to the "Golden Ears Club"
well I have an AXON 4,7 uF PP at output and clearly see his dark signature
that Is why ask

for me AXON Is not a option at all
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Old 24th June 2012, 09:29 AM   #1506
Swarky is offline Swarky  Canary Islands
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Balderdash is a concise but polite and slightly old-fashioned way of saying "I´m sorry but my experience prevents me from agreeing with that. = pamplinas (con cariño).
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Old 24th June 2012, 03:10 PM   #1507
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by alazira View Post
"Balderdash" is just a colorful way of saying "Poppycock" , at least as far as low tempco resistors goes according to his analysis.
Thanks

Quote:
Originally Posted by Swarky View Post
Balderdash is a concise but polite and slightly old-fashioned way of saying "I´m sorry but my experience prevents me from agreeing with that. = pamplinas (con cariño).
I think balderdash = tonterias
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Old 24th June 2012, 04:03 PM   #1508
Siberia is offline Siberia  Lithuania
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Default where's my voltage gone

Hello,

I'm building a two box Pearl II RIAA setup with SSLV1.1's. Tx, rectification bridges and first caps (4700uF) are in the PSU box. 0V lines are tied together when entering 3 wire umbilical. Shunts with additional 4700uF caps and RIAA boards are placed in the other.

At the entering of RIAA box I've got nice and steady 35.3VDC. Meanwhile after connecting SSLV with dummy load (600R) attached, I've got 30.5VDC on board smoothing cap and can't get my target 24V right.

I used two red leds, 1.8 kOhm for R303 and 5K trimmer for my Vref setting. With the trimmer at the max there's above 22Vout.

What might cause the lowdown? I've tried PSUD2 simulations and none of them confirm the actual voltage behaviour.

Thanks.
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Old 24th June 2012, 06:34 PM   #1509
Salas is offline Salas  Greece
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SSLV1.1 builds & fairy tales
Normally the 35.3 to 30.5 should be bcs you CCS load your Tx and rectification stage.
Lets assume a 3mA (in circuit Id) mid way GR K117 in your Vref and 6.8K max resistance. That gives 6800*0.003=20.4V plus Vbe and Led(s). Looks normal. Boost your Vref. How high you wanna go? No more than 24-25Vo with your Vi I would suggest. Try 3K3 instead of 1K8 and see what happens.
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Old 25th June 2012, 07:30 AM   #1510
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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