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Old 4th January 2013, 09:26 PM   #801
chiily is offline chiily  United Kingdom
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Quote:
Originally Posted by FdW View Post
@chiily, IMO you are using BC327/337 with very high Hfe's in the PSU, it is not exactly oscillating but it is regulating as expected in a kind of semi-SMPS-mode (I would call it ). You could try to use BC's with a lower Hfe or you could try to lower R100, 103, 200 and 203 from 330ohm down to 47ohm. Be sure that C105, 205 are of a high-esr (cheap) type (do not use low-esr capacitors here). Also you could try to add a small (10/20pf or so) capacitor between B and C of Q105, 205.
Thank you for your help...

Okay, I can't remember which hfe bin the PSU BCs came from...I'll try some from the lowest hfe bin, but the hfe of the 337 starts where the 327's hfe finishes . Is that for all the BCs in the regulator stage, or specific ones to target first?

Though Am I better lowering the resistors? Resistors are easier to de-solder
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Last edited by chiily; 4th January 2013 at 09:34 PM.
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Old 4th January 2013, 09:34 PM   #802
chiily is offline chiily  United Kingdom
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Originally Posted by Benedetto View Post
Hello there,
i dont know if it helps anyone.
But, before Chris/Take five, got his Paradise working,
he had very similar issues like noise, oszilation and so on.
He found his solution thru hooking up just one channel,
much better, but still a bit noisy.
Luckyly hes got some accus from his RC Hellacopta.
After installing double mono independent psus, just music !
Because those problems mentioned by other builders sound
similar to me, it might be helpful to know how EXACTLY their
PSUs are hooked up.
Possibly...
I have a simple CRCRC with four QSpeed diodes. R is 0.47, C is about 6,800uF each. Really simple...

As I've only built one board I just have one transformer, CRCRC - a mono supply.
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Old 4th January 2013, 09:36 PM   #803
chiily is offline chiily  United Kingdom
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Originally Posted by Joachim Gerhard View Post
Anyway, when somebody gets frustrated because of our work i really feel the pain.
I'm not frustrated...The help I'm getting on here is wonderful. I'm sure we'll, together sort out the problems I'm seeing. Then other people can learn from what we have done...

there is always hope
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Old 4th January 2013, 09:50 PM   #804
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Originally Posted by Bksabath View Post

TELL IN YOU A LAST TIME you need 2 suply for Paradise


This rhymes beautifully. Is it from a song?
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Old 4th January 2013, 10:04 PM   #805
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Nah not song of mine but obviously serving the purpose
You get 100 points....
BRAVO !!!!
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Old 4th January 2013, 10:25 PM   #806
quan is offline quan  Australia
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Originally Posted by Bksabath View Post
Nah not song of mine but obviously serving the purpose
You get 100 points....
BRAVO !!!!
Very funny man.. I have finished only the PSU stage +/- 18V rocked-solid. Now still waiting for the next bunch of BCs to arrive to measure and complete the next stage itself. In the regulator section i used hFE ~300 BCs.
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Old 4th January 2013, 10:29 PM   #807
chiily is offline chiily  United Kingdom
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Originally Posted by quan View Post
Very funny man.. I have finished only the PSU stage +/- 18V rocked-solid. Now still waiting for the next bunch of BCs to arrive to measure and complete the next stage itself. In the regulator section i used hFE ~300 BCs.
None of the BC337s I have go that low..they start at around 500...
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Old 4th January 2013, 10:33 PM   #808
studeb is offline studeb  United States
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it might be interesting to see what hFE are used and where in the working ones, and what are used in the ones that people are having trouble with.
Especially as JG says 400 is enough.
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Old 4th January 2013, 10:44 PM   #809
quan is offline quan  Australia
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Quote:
Originally Posted by chiily View Post
None of the BC337s I have go that low..they start at around 500...
My GB BC 337 started from 490 upwards and Bc327 from only 310-360 thus not a single match transistor. I bought some BC 327/337- 25 from tayda electronics but most of them measured up to 300 only so the search continues.From Oz the options are limited in ordering components and so expensive.
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Old 4th January 2013, 10:49 PM   #810
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And we are back to BCXXX40 problem

I have started a new tread maybe worth posting there.
The whole Idea is to swap transistors as needed

Paradise BCXXX-40

Chiily I have plenty of low 327 (380 Hfe) as posted there and far to many 327 with Hfe abowe 560 my NPN are around 500 (fairchild) and 420 (GB)
Got 2 batches from Fairchild and the ones in goodies bag

Unless we help each others out matching Hfe is a problem
send PM with your addres and I will send you same of what I have if you need it
I am going to order same from diotec from conrads as soon as my bank account recovers from the recent festivity

But once more my R2 boards where built with the realy hi Fairchilds and are fine

Last edited by Bksabath; 4th January 2013 at 10:52 PM.
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