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Old 29th April 2012, 11:11 AM   #1091
AndrewT is online now AndrewT  Scotland
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It looks like the 200mVgs change is telling you that the 610 does not like what you are asking.
Add in mains voltage changes and the 610 is going to struggle to maintain CCS current constancy.

Basically, I am still disagreeing with Salas.
Your Input voltage rejection ratio is going to suffer, because the Vgs is approaching the Vds of the pass device.
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Old 29th April 2012, 03:10 PM   #1092
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by manamanam View Post
Arcotronics R75?
Sorry is MKT Aroctronics R60
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Old 29th April 2012, 05:23 PM   #1093
manamanam is offline manamanam  Greece
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Sorry is MKT Aroctronics R60
So it's a MKT, not a MKP. Makes sense you got better results with the Auricaps.
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Old 29th April 2012, 09:22 PM   #1094
RCruz is offline RCruz  Switzerland
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SSLV1.1 builds & fairy tales
While waiting for BiB round 2, I decided to try it in p2p style.

I am posting the layout hoping all connections are ok.
Attached Images
File Type: png P2P BiB.png (35.1 KB, 335 views)
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Old 30th April 2012, 06:57 PM   #1095
RCruz is offline RCruz  Switzerland
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I wonder what should be the best values for R3 and R5 to get 14Vout ?
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Old 30th April 2012, 09:16 PM   #1096
Salas is offline Salas  Greece
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Its all in the guides, but a quick answer would be about 5K total series variable resistance in the Vref. Check for ~3mA IDSS Q3. That one you show has those resistors in parallel than in series and misses one or two LEDS VS the PCB one. Will work also, if maybe a bit driftier.
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Old 1st May 2012, 09:04 PM   #1097
merlin el mago is offline merlin el mago
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Quote:
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Arcotronics R75?
Do you know where can buy them?
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Old 1st May 2012, 10:55 PM   #1098
pellesmil is offline pellesmil  Norway
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Hi
have started the build of a single positive bjt reg ( i have a IRF reg to but am building the BJT first).
I am feeding it with a 50va 18v trans. and need 210ma to feed my Dynavector P-075mk2 RIIA, i have used a 6 AH led battery with great success (even when it drains fast)

I built the reg with 4 green leds and a 10ohm R301 that gives me 300ma ccs
it worked smooth with my 240ma dummy load.

But when hooking up my RIIA it refuses to bring it up to 12 v it stops at about 2.5v, when "helping" it whit a battery it starts and works well.

Raising the CCS to 400ma 6,6ohm the RIIA starts if the regulator is powered up and running without load and hooking up the load later.

Raising the CCS again to 536ma 5ohm it starts both hooked up at the 12V side when plugging in the A/C and when hooking up the 12V


So here comes the essence:

-Can i run above 500ma CCS when i only need 210ma? (meaning is it conductive to sound quality)
-Would a different setup work better? am running 4,7uf MKT C304 and BJT
-Would it be wise to use good (Dale maybe) 1ohm r307 in the Zobel ? (and other resitors as well)

Thanks

Per

Last edited by pellesmil; 1st May 2012 at 11:12 PM.
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Old 1st May 2012, 11:11 PM   #1099
Salas is offline Salas  Greece
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Is it a high start up current need from the Riaa, or some instability between the reg and Riaa? It takes to watch it with ameter and oscope to really know. If its a matter of needing more current, using >500mA is no constraint if your sinks are still under 60C. And it is conductive to SQ, though anti energy star. :-) Are there any high value electrolytics on the Riaa +V that they try charge up and demand much instant current? Maybe a good idea to delete them. Don't know if 1R R107 can be picked up quality wise. But it should be present with MKT Zobel. What do you mean helping it with the battery? Touching the battery between V+ & GND Riaa and then it kickstarts?
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Old 1st May 2012, 11:23 PM   #1100
pellesmil is offline pellesmil  Norway
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Thanks

Quote:
Originally Posted by Salas View Post
Is it a high start up current need from the Riaa, or some instability between the reg and Riaa?
yes i guess its a high startup current, when using a battery i see a spark when connecting power.

Quote:
Originally Posted by Salas View Post
Are there any high value electrolytics on the Riaa +V that they try charge up and demand much instant current?
i dont know i will investigate later i suppose so


Quote:
Originally Posted by Salas View Post
What do you mean helping it with the battery? Touching the battery between V+ & GND Riaa and then it kickstarts?
Yes

Thanks gain

Per
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