The simplistic Salas low voltage shunt regulator - Page 475 - diyAudio
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Old 25th January 2012, 08:17 PM   #4741
RCruz is offline RCruz  Switzerland
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O... I did not read the inscriptions... What type of chip is it ?
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Old 25th January 2012, 08:27 PM   #4742
krivium is offline krivium  France
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Calmart, try page 429 post #4287 of this thread for Reflektor description.


Quote:
Only if you can cool Q3 with TO-92 minisinks. Its a matter of dissipation for that high Vout. The others in the current mirror don't suffer as much voltage drop.
Salas, please excuse me i wasn't clear with my last question, 2sc2240 or BC639 for cascode CCS? (for Q1,2,3,4 KSA1381 planned).

After quick look at schematic, for R1, approx 23r for 30ma seems right?

Last edited by krivium; 25th January 2012 at 08:34 PM. Reason: question about R1 added
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Old 25th January 2012, 08:46 PM   #4743
Salas is offline Salas  Greece
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Both are good for implementing a ring of two 2mA CCS for over 60V. R1 will be giving current as Vbe/R1. Depends on the transistor used, but 0.6-0.7V should be ballpark.
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Old 25th January 2012, 08:47 PM   #4744
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
O... I did not read the inscriptions... What type of chip is it ?
Mini shunt reg.
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Old 25th January 2012, 08:54 PM   #4745
krivium is offline krivium  France
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Thanks Salas.
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Old 25th January 2012, 11:50 PM   #4746
Salas is offline Salas  Greece
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You got to run extra current for the reg itself remember, its a waster.
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Old 26th January 2012, 12:27 AM   #4747
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Quote:
Originally Posted by krivium View Post
Calmart, try page 429 post #4287 of this thread for Reflektor description.
Sorry about the Reflektor confusion. I didn't know what it was.

What voltages can be implemented, in versus out, for those component values in post #4287?
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Old 26th January 2012, 12:46 AM   #4748
Salas is offline Salas  Greece
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Not more than 40V max In if you got 2SK170, no more than 30V max In if you got BF245B (470R R4 when with 245B) for J1. 34V out and 24V out respectively. 10K trimmer for R6 connected as rheostat should cover all that range. Won't go lower than about 7 Vout in both cases.
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Old 26th January 2012, 11:19 AM   #4749
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The regulator looks quite flexible. No concerns about minimum or maximum currents?

Good to know about the BF245B, which I think I can get here in Brazil.

What about the IRF types? Some flexibility with them too?

I have to check which ones might be available here. In any case I think the SK170 and those IRF can be found on eBay, probably with the same JC-2 kit vendor.
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Old 26th January 2012, 12:08 PM   #4750
krivium is offline krivium  France
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Quote:
You got to run extra current for the reg itself remember, its a waster.
Thank again Salas, planned as 3x current needed by load in reg, and 3x reg current need for prefiltering.
I asked about R1 just to be sure about calculation, not missing something from your explanation.

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In any case I think the SK170 and those IRF can be found on eBay, probably with the same JC-2 kit vendor.
Be careful about SK170 at the ebay... many many fakes.
Be sure that seller accept return and cash refund and check your whole lot at arrival for Idss as you'll have to do it anyway. If off spec they're fakes so send them back.

Last edited by krivium; 26th January 2012 at 12:10 PM. Reason: adding arguments.
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