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Old 16th May 2013, 12:43 AM   #421
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Join Date: Aug 2009
Location: Smederevo, Serbia
Yes, I'm great man, I have almost 100 kg.

Well, I'm stuck with enclosure. I don't have much free time, proper tools and experience. Two months and yet not finished.

Tomorrow I'll post PDF.

Regards to shaan, my friend Miomir and all peeceebee diyers.
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Old 16th May 2013, 12:57 AM   #422
naf is offline naf  Indonesia
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Quote:
Originally Posted by JOHN BALI View Post
Dear Shaan,
if I changed some parts is that okay...
on the picture I replace BD139-140 with something different
not soldered yet, if it is okay I will solder if not I will replace with 139-140 instead...

In my PeeCeeBee also we can add a pair more 1000uF at the rails if needed
BTW what is the HFE of your input pair?
I don't have any matched yet,

Regards
Nice progress Bli, are you using toshiba's 1360/3423 ? Yea..good choice, i used it on my my SSA peeceebee..
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Old 16th May 2013, 11:04 AM   #423
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My layout, as promised.
Some components aren't standard, for instance input cap is very big (RM 37,5). I've made peeceebee according to components I already had at home. Basically, it's shaan's peeceebee.
Attached Files
File Type: pdf VSSA Shaan layout.pdf (818.7 KB, 579 views)
File Type: pdf VSSA Shaan bottom.pdf (249.6 KB, 350 views)
File Type: pdf VSSA Shaan silk.pdf (220.0 KB, 349 views)
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Old 16th May 2013, 11:21 AM   #424
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by shaan View Post
...................Approximately 380. BC559B/BC549B.

Try using the ones having the highest rated ones, i.e. 'C' suffixed ones with hFE of 600 or more.
bc5xxC have hFE from 400 to 800.
That 400 minimum limit is only 5.3% more than the 380 he measured.
There is a high probability that a group of C grade will be substantially in the hFE range of 400 to 450.
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Last edited by AndrewT; 16th May 2013 at 11:25 AM.
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Old 16th May 2013, 01:12 PM   #425
shaan is offline shaan  India
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Most of the PNP group 'C' trannies I own have higher hFE than 650. But I didn't use them coz the all the NPN counterparts are all between 500 to 550. The 'B' rated pairs, although low gain, are more close in this regard, hence chosen.

Hi dovrivoje. Thanks for uploading the layout files.
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Old 16th May 2013, 01:32 PM   #426
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Quote:
Originally Posted by shaan View Post
Approximately 380. BC559B/BC549B.

Try using the ones having the highest rated ones, i.e. 'C' suffixed ones with hFE of 600 or more.
Ok thanks, as I match BC550-560B I also get two matched pairs around 380 but different manufacture/brand.
I'm also matched two pairs 2SA-SC and get around 400, & I will use it.
My PeeCeeBee is designed for BC but I think I can put it on with a little trick

Quote:
Originally Posted by AndrewT View Post
bc5xxC have hFE from 400 to 800.
That 400 minimum limit is only 5.3% more than the 380 he measured.
There is a high probability that a group of C grade will be substantially in the hFE range of 400 to 450.
Hi Andrew, it is hard to find real C grade here, lately I found few 550C after measure hFE with cheap DMM it show bellow 300. I only have BC549C & hFE 700+ and some 2SC that around 600-800+ but no 2SA.

BTW can we hear the difference between HFE of 400 & 600 or more?
I think it is okay to use it (hFE 380-400) because I can wait any longer that I want to made it

Quote:
Originally Posted by PMI View Post
Speaking of transistors, I wonder if Shaan, or someone else, should say a little about measuring/matching the transistor pairs, at what current, and how closely they need to be matched.

What I do NOT know is the best method for this specific circuit. I can make a guess, but perhaps this is something that has come op in one of the other SSA or TSSA threads... ?
Hi PMI just use cheap but trusted DMM, I have use two kind DMM & still like the cheaper one ...
We are matching to "compare" one & another to get matched one but with some variable (time, temperature, what we use, etc)
My point is:
use same DMM
almost same time
same temperature & don't let your hand touch the DUT because it is very sensitive, the higher hFE even more.

BTW I use my bare hand to put it on the DMM & wait for a moment and then note the result. After it is done I leave the DUT so it is back to room temperature & measure again to make sure the result
I know it is not so accurate also time consuming too
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Thank you, I wish you happy
peace & G B U

Last edited by JOHN BALI; 16th May 2013 at 01:36 PM.
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Old 16th May 2013, 04:29 PM   #427
shaan is offline shaan  India
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Link to dobrivoje's peeceebee added.
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Old 16th May 2013, 06:05 PM   #428
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Default how to first power up

Hi Shaan, I wish I have a link too , later...
BTW
There is no guidance how to safely power up our PeeCeeBee & what we need to measure at first time... (maybe I miss it)
Actually I don't know how to measure current that flows on the LatFet, usually I measure at the power resistor (0,22-0,33R) if any

Added link for quick guidance for newbie like me is very good
and
This how I put 2SA-SC transistor on BC PeeCeeBee
Attached Images
File Type: jpg WP_000560.jpg (123.6 KB, 1188 views)
File Type: jpg WP_000561.jpg (147.2 KB, 732 views)
File Type: jpg WP_000569.jpg (246.9 KB, 718 views)
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Thank you, I wish you happy
peace & G B U
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Old 16th May 2013, 06:30 PM   #429
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Hi Shaan,

Alfet now is beautifully singing. Based on your peeceebee design. I re-designed the output side in paint to accommodate the alfet. The vocal is crystal clear, very very detailed, the highs very smooth and the bass is there well balance. I modified some components values to suit my taste. Running at low temperature in normal listening volume with small heat sink. I like this very much than previous one. Dc offset 0.0mV - 0.5mV. When using analog tester, the pointer stays at zero at 0.1 DCV setting.

Regards,
Boyet
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Old 16th May 2013, 07:42 PM   #430
PMI is offline PMI  United States
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@boyet: Which Alfet did you use? With or without external protection diodes?
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