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Old 9th August 2013, 02:20 PM   #2361
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Marra View Post
I'm sure I read it somewhere back in the thread but can't seem to find the information that I am after. I have two R cores one with 2x15v secondaries and the other of better quality with 15-0-15v is it possible to use the latter to power a bib? Tia.
Seems OK. That'll give you 15V rms across the outside windings with the center tap at ground. Use a 2 diode configuration. Voltage might be a bit high, but you can also use a dropping resistor to bleed a bit of that voltage down if needed.
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Old 10th August 2013, 09:30 AM   #2362
AndrewT is offline AndrewT  Scotland
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15Vac is the usual supply for a regulated 15Vdc.
But the CCS then Shunt drops more voltage than a normal series regulator.

You may find that on low mains voltage the Shunt regulator drops out.

For +-15Vdc I'd suggest you use 18-0-18Vac
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Old 10th August 2013, 10:11 AM   #2363
Marra is offline Marra  United Kingdom
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Thanks Andrew;I do have an Rcore with 2x18v secondaries so I guess thats the one to use.
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Old 10th August 2013, 11:27 AM   #2364
AndrewT is offline AndrewT  Scotland
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That should give plenty Vdrop across the CCS stage.
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Old 8th October 2013, 03:53 AM   #2365
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[QUOTE=Salas]
Quote:
Originally Posted by alexkosha
Hi Salas,

I learned BIB manual and come up with the final setup list.
I need your advice about general set (if I understood what and how correctly) and precision for 301.

1. a. Vin from Raw DC = 39.9V
b. Vout (which I need for BHL) = 24V
c. Constant current (R301) = 200mA (per your advice for current limit)
d. Load consumption = 50mA (measured about 30mA with Fluke DVM on idle)
e. 3 Yellow or Green LEDs = all for 2.1V (D102A Vf = 0)
f. Q103 Idss = 4mA (not measured, and left as is) – how important to measure it in such precision? Also how important to set 302,303 and 305 in gain progressive order?
g. 2 Red LEDs = all for 1.9V
h. R103 = 1k8 1/4W (per EXL with 5k potentiometer) – Any particular brand/% spec/PPM?
i. Temp and safety factor is the same as in your initial table.

So, R301 is calculated to 8R9. I can’t find such value and since you mention “ballpark” values then what should I use: 8R2, 9R1 or 10R?
Kiwame 5W – is this one should be OK? Any other preferable brands and types?

You already advised about heatsink for 8W and I have it.

Last question: if I use Raw DC in separate box based on you Folded manual, then I do not need to use rectifier and (C305) 4700uF in input section of BIB. I need to bypass it. Right?

It will help me a lot.
Thank you.
Answer from Salas:

e. Green are easier to find in 2 to 2.2V than yellow
f. 10% will do. The other two can be randomly populated if not over 5mA.
g. One red led will be enough in your case. Jumper the 2nd led's pads.
h. Vishay or alike metal film no more than 100ppm

R301. Use 8R2 2W Vishay or alike up to 100ppm or Caddock MP925 or 930-8 without sink. Some claim the Caddock is the most synergistic.

Last edited by alexkosha; 8th October 2013 at 03:58 AM.
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Old 8th October 2013, 03:56 AM   #2366
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[QUOTE=Salas]
Quote:
Originally Posted by alexkosha
Hi Salas,

Thank you for that detailed answers. I'll flow your directions as soon as I'll receive BIB kit. tea-Bag committed to sent it over at the end of October.

How about my "last question": If I use Raw DC in separate box with umbilical cord based on your Folded manual, then I do not need to use rectifier and (C305) 4700uF on input section of BIB. I need to bypass it. Right?

One more: can use 9V battery to test JFETs?
They asked for current limited PSU in that guide, but why batter is not enough to use there?

Thank you.
Answer from Salas:

Right, bypass it. Go directly to the pins of the local 4.7mF cap's position. You could also use 470uF there for decoupling and termination of the incoming wires though.

You can use 9V batteries alright.

Last edited by alexkosha; 8th October 2013 at 03:59 AM.
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Old 9th October 2013, 05:48 PM   #2367
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Hi Salas,

I have a question related to BIB manual.
You mentioned that R105, R205 and R305 should be equipped with Trimmer Bourns 3296Y style. I see that all pads on PCBs are in-line and such design required 3296W and not Y. Please see attached SPEC and let me know which is required: W or Y.
Attached Images
File Type: jpg 3296Y or W.jpg (80.1 KB, 182 views)
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Old 9th October 2013, 06:06 PM   #2368
Marra is offline Marra  United Kingdom
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I've just checked my bib pcb's and they are drilled and have solder pads so that you can use either.
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Old 9th October 2013, 06:11 PM   #2369
Salas is offline Salas  Greece
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Yes, that photo is from the prototype. All the circulated boards had both options pads. ;-)
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Old 9th October 2013, 09:06 PM   #2370
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I see. Thank you.
I did not get my BIB PCB yet, but I did see the picture in manual.
At that case I safe...
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