The simplistic Salas low voltage shunt regulator - Page 477 - diyAudio
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Old 31st January 2012, 02:12 PM   #4761
klewis is offline klewis  United States
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Quote:
Originally Posted by Salas View Post
There is something wrong going on initially. There should always be 4mA available to charge the filter capacitor. Can 2000uF be overkill to start up? Here is an alternative routing by the way.
Hi Salas
Regarding post #4703 the Reflektor board layout, I don't see cap C1. It shows 1uf on the schematics. What type of cap should it be? MKP? C3 on your schematic shows as C4 on the board should it be MKP? And C2 1000uf panasonic FM ok?

Best
Ken
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Old 31st January 2012, 02:14 PM   #4762
Salas is offline Salas  Greece
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MKP in the RC across the output. C2 FM OK. Board has its Eagle designations (C1+). There is up to C3 only, which is the included rectification's filter capacitor.
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Old 31st January 2012, 03:28 PM   #4763
klewis is offline klewis  United States
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Quote:
Originally Posted by Salas View Post
MKP in the RC across the output. C2 FM OK. Board has its Eagle designations (C1+). There is up to C3 only, which is the included rectification's filter capacitor.
So, omit C1 shown in the schematics?
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Old 31st January 2012, 03:39 PM   #4764
Salas is offline Salas  Greece
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Will post here again, from Eagle so you can picture it easier. M2 is a Mosfet also, BJT symbol used for library reasons, same for J1, is a JFET. Rectification of two type diodes choice and filter capacitor are also on board.
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Old 31st January 2012, 04:21 PM   #4765
klewis is offline klewis  United States
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Thank Salas,

It's a bit different from post #4287.

Ken
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Old 31st January 2012, 04:34 PM   #4766
Salas is offline Salas  Greece
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It misses a snubber across C2 to the first inception that after subjective evaluations of members was judged not adding much. So it got even less parts count. Has a trimmer for adjustable Vo instead of R6 also.
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Old 31st January 2012, 07:33 PM   #4767
branet is offline branet  Croatia
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I have Pro Ject Phono Box SE II and I want to make external power suplay.
I need 16V 215mA suhunt regulator.
Which version of salas shunt regulator would you recommend?
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Old 1st February 2012, 03:15 AM   #4768
Salas is offline Salas  Greece
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Any. Reflektor and SSLV1.1 the easiest to make.
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Old 1st February 2012, 05:23 PM   #4769
mns80 is offline mns80  Finland
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Default 6 shunts?

I have been "experimenting" with some pre amps and phono amps and have settled on the ones I'd like make or already have made. The phono will be the 37dB Salas simplistic RIAA as per the pdf, at the moment on breadboard. First I tried it out with a CRCRC+317 to get some kind of a feel, sound was good but there was too much noise so just for fun I tested the V1.2R up to 45V on a breadboard. What a difference, totally silent and the sound is soo much better! The preamp then is a slightly modified version of the cascoded jboz that Juma posted in the Jfet BOZ thread which sounds great. I tried some other versions too but did not like them as much.

As the RIAA sounded that much better with one shunt for 2 channels I was thinking of doing shunts for all the supplies, 2pcs for 40V (preamp), 2pcs 24V for the RIAA and 2pcs for the -3.5V (preamp). I have one transformer 2x40V 150VA and one transformer 2x12V 80VA. For the 40V and 24V I was thinking of using the 150VA 40V transformer and for the -3.5V the 80VA 12V.

Do you think this will be too much for the transformers or too overkill for the application that I am thinking of or do you have any other comments?

Regards,
Mats
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Old 4th February 2012, 04:27 PM   #4770
branet is offline branet  Croatia
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I decided to bulid salas SSR1.1.
I read SALAS REG SSR v1.1 BIB GUIDE REV2 But because of my poor English and poor knowledge of electronis I need a little help.
My Pro Ject Phono Box SE II need 215mA + 70-150mA excess max load-350mA.
DC in is 26V and V-out 16V.
I use calculator from salas but I would love someone to just check the value of
R101,201- 10,2 ohm
R103,203- 2500 ohm
R105,205- trim 550 ohm
Is it o.k!?
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