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Old 5th January 2013, 02:39 AM   #811
quan is offline quan  Australia
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Quote:
Originally Posted by Bksabath View Post
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
Thank you. Pm on your way. BTW i did post on the trade/swap thread but no reply.
quan.

Last edited by quan; 5th January 2013 at 02:53 AM.
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Old 5th January 2013, 07:27 AM   #812
RCruz is offline RCruz  Switzerland
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I used 580Hfe transistors in the shunts and they work perfectly.
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Old 5th January 2013, 09:23 AM   #813
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by PMA View Post
My recommendation, at this stage, would be a GHz FFT spectral analyzer. I was facing a similar problem 3-4 years ago and it was the only way how to disclose and localize the issue.
The Ghz scope is currently in the repair shop EEVblog #405 - Lecroy 9384C Oscilloscope Repair - Part 3 - YouTube
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Old 5th January 2013, 09:27 AM   #814
FdW is offline FdW  Netherlands
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Originally Posted by RCruz View Post
I used 580Hfe transistors in the shunts and they work perfectly.
This (and other experiences reported) make me doubt the Hfe hypothesis. If I read these well it may even be that higher Hfe's work better... I have to think about this.
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Old 5th January 2013, 09:32 AM   #815
PMA is offline PMA  Europe
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FdW, just have sent e-mail to you.
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Old 5th January 2013, 09:33 AM   #816
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by chiily View Post
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
The resistors is easiest, just parallel the 330 by a 56ohm value and when it makes no improvements you can easily remove them.

Maybe the next thing to try is adding the ceramic 10/20 (or even up to 100pf) capacitors, this is also easy to implement and remove (if needed).
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Old 5th January 2013, 10:59 AM   #817
Take5 is offline Take5  Germany
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HFE: all transitors on my boards between 460 - 465, works fine.

Chris
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Old 5th January 2013, 04:19 PM   #818
Marra is offline Marra  United Kingdom
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I finally fired up the Paradise;well regulator sections only as I still need to obtain better matched transistors; and it worked as expected
I used a transformer with 20V secondaries which gave +- 27.3 vdc at the board and was able to adjust the reg output when things had warmed up.The heatsink settled at 50C after 30/40 mins. Back to matching transistors.
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Old 5th January 2013, 05:07 PM   #819
FdW is offline FdW  Netherlands
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Originally Posted by Marra View Post
I finally fired up the Paradise;well regulator sections only as I still need to obtain better matched transistors; and it worked as expected
I used a transformer with 20V secondaries which gave +- 27.3 vdc at the board and was able to adjust the reg output when things had warmed up.The heatsink settled at 50C after 30/40 mins. Back to matching transistors.
Cool, or actually rather warm but not to (e.g. 50degC if fine).
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Old 5th January 2013, 06:15 PM   #820
Take5 is offline Take5  Germany
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One step beyond: impatient i build up a psu with stock parts of my shelf. Works better like the lipo batteries, no hum, no noise, im amazed about the silence.

I think its also the result of the shunt regulator design, thank you FdW!

Click the image to open in full size.

Next step: sending some bucks to italy, buying some cases. I want build it up like my sold pass pearl:

Click the image to open in full size.
Click the image to open in full size.

Chris
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