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Salas low shunt Group-design by Salas

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#382
VT67 said:
Anybody here who can give some recommendations for the capacitors.
Generic or boutique types, what to pay attention to, low ESR or not.

Regards
Click to expand...

Vref use the better cap you can afford or can get: BG, Silmic II, Pana FM or FC, etc, low capacitance values use film better to worse: teflon, polysterenes, mkp, etc.

Important thing: one time settled the Vout with the trimmer, measure the trimmer resistance & change for fixed value wiht low temco ppm, here advice; Vishay nude, Caddock TF020, etc. If you like to left the trimmer my advice is to use a Vishay 1280G trimmer (like I use): Bulk metal foil pc mount type, much superior to any cermet or conductive plastic trimmer, the best available… .75W, 15ppm, 26 turns for ultra-precise adjustment. Can buy Michael Percy Audio:

Catalog: http://www.percyaudio.com/Catalog.pdf

E-mail: mpercy@pacbell.net

Enjoy

Felipe
 
#383
VT67 said:
Anybody here who can give some recommendations for the capacitors.
Generic or boutique types, what to pay attention to, low ESR or not.

Regards
Click to expand...

Vref use the better cap you can afford or can get: BG, Silmic II, Pana FM or FC, etc, low capacitance values use film better to worse: teflon, polysterenes, mkp, etc.

Important thing: one time settled the Vout with the trimmer, measure the trimmer resistance & change for fixed value wiht low temco ppm, here advice; Vishay nude, Caddock TF020, etc. If you like to left the trimmer my advice is to use a Vishay 1280G trimmer (like I use): Bulk metal foil pc mount type, much superior to any cermet or conductive plastic trimmer, the best available… .75W, 15ppm, 26 turns for ultra-precise adjustment. Can buy Michael Percy Audio:

Catalog: http://www.percyaudio.com/Catalog.pdf

E-mail: mpercy@pacbell.net

Enjoy

Felipe
 
#384
VT67 said:
Anybody here who can give some recommendations for the capacitors.
Generic or boutique types, what to pay attention to, low ESR or not.

Regards
Click to expand...

Has been modelled with Pana FC 0.3-0.35 Ohm 100Khz impedance for 130deg loop stability margin. For few questions (if not really covered before) look in the original development thread.
 
#386
Salas said:
Has been modelled with Pana FC 0.3-0.35 Ohm 100Khz impedance for 130deg loop stability margin. For few questions (if not really covered before) look in the original development thread.
Click to expand...

These specs are needed for all lytics caps?

Pana FC 220uF 100khz only 350 mOhm 6.3 & 10V...I have 63V 100khz 130 mOhm it's ok?
Pana FC 1000uF 100khz 36 mOhms it's ok?
 
Last edited:
#388
Hi all!
I post the circuit Salas low shunt V1.0 again for you fin the part!
 

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  • Cricuit Salas low shunt V1.jpg
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#400
BOM

B.O.M.

+1.5V to +5V (If need +5V better 5-35V with 2 mosfets)

Diodes
D1-D4 MUR140 or 1N5822 for 1A out x 4

Resitors & trimmers
R1 current adjust.
R2-R3 220R
R4-R5 2K2
R6 27R
R7 10R
VR1 500R

Caps
C1-C4 0.1Uf/63V or not needed
C5 2200-4700uF/16V
C6 47uF/16V
C7 1000uF/12V
C8 47uF/6.3V Pana FC 0.3-0.35 Ohm 100Khz impedance for 130deg loop stability margin

Mosfet, transistor & JFets
Q1 IRF9520 or IRF9540
Q2 BC560
Q3, Q5 2SK170
Q4 BC550
Q6 D45H8

Heatsinks
Q1 & Q6

======================

+5 to +35V

Diodes
D1-D4 MUR140 or 1N5822 for 1A out x 4

Resitors & trimmers
R1 current adjust.
R2, R5 220R
R3 100R
R4 47R
VR1 500R

Caps
C1-C4 0.1Uf/63V or not needed
C5 2200-4700uF/16V-63V
C6 220u/16-63V
C7 47uF/63V Pana FC 0.3-0.35 Ohm 100Khz impedance for 130deg loop stability margin

Mosfet, transistor & JFets
Q1 IRF9520 or IRF9540
Q2, Q3 & Q5 2SK170
Q4 BC550
Q6 IRF9540

Heatsinks
Q1 & Q6

Leds
L1-L4 green generic

====================

-5V to -35V

Diodes
D1-D4 MUR140 or 1N5822 for 1A out x 4

Resitors & trimmers
R1 current adjust.
R2, R5 220R
R3 100R
R4 47R
VR1 500R

Caps
C1-C4 0.1Uf/63V or not needed
C5 2200-4700uF/16V-63V
C6 220u/16-63V
C7 47uF/63V Pana FC 0.3-0.35 Ohm 100Khz impedance for 130deg loop stability margin

Mosfet, transistor & JFets
Q1 IRF520 or IRF540
Q2, Q3 & Q5 2SK170
Q4 BC560
Q6 IRF540

Heatsinks
Q1 & Q6

Leds
L1-L4 green generic


==========

I'm waiting will be usefull

Enjoy

Felipe
 
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