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Old 16th December 2012, 09:43 AM   #521
beetle is offline beetle  Germany
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Quote:
Originally Posted by FdW View Post
Yesterday I did not manage to do this, I will try to do it this evening
Did you found time so far?
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Old 16th December 2012, 09:50 AM   #522
rsbay is offline rsbay  Germany
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Default DC Input Connector

I want to place a WAGO 231 type connector to the DC input.

My question :
What is the distance between the pads 5.0mm or 5.08mm?

Thanks for your support

Ralph
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Old 16th December 2012, 10:07 AM   #523
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5.08 mm.
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Old 16th December 2012, 11:37 AM   #524
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Hello all
I posted earlier (#472) measurement of some Fairchild BC337s.

You will find below measurements of BC337s manufactured by ON Semi, purchased from Digikey Canada in early December. Part number BC337-040GOS-ND, Date code April 2010, made in China. Again the circuit used is as shown in Post #72.

Results:
HFE #
>465 20
460-465 8
455-460 6
450-455 10
445-450 1
440-445 9
435-440 8
430-435 12
425-430 19
420-425 6
415-420 15
410-415 19
405-410 21
400-405 24
395-400 29
<395 36

These are lower values than the Fairchild devices.

BC227s measurements are next. ON Semi first, then Fairchild.

Pierre
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Old 16th December 2012, 06:10 PM   #525
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by beetle View Post
Did you found time so far?
Yes I did, and I do not know what to say

The attached picture has your numbers in it, it is fed from the voltage you gave, it generates the output voltage you measured. Then I added your measured voltages (test points, Vbe’s and Vak’s of the LED’s) and I sat back and watched

And my conclusion is, I DO NOT UNDERSTAND IT

There are no Si based transistors with a Vbe of 0.2V (as calculated) or 347mV (as you measured).

The PSU is operating as expected, outputting +18.23V and -18.21V, the current sources seem to work. Now we need some smart person to figure it out.
Attached Images
File Type: png PSU riddle.PNG (94.8 KB, 260 views)
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Old 16th December 2012, 07:06 PM   #526
hesener is offline hesener  Germany
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Quote:
Originally Posted by sq225917 View Post
Hopefully this will spur on some responses.

Click the image to open in full size.

All soldered up just wondering about how to wire up the loading resistor? Am i right in thinking it just goes from signal to ground. If so can I place it at the input on the pcb
Looking good!! Yes, the input resistors can go on the second pair of input contacts, thats why they are there. They should be connected "floating" from that point, that means, do not connect the input resistor to GND at the resistors but only here.
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Old 16th December 2012, 07:09 PM   #527
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
That looks very good. So you have a Paradise R2.
Ah yes..... the final bug.... the PCB on the picture is R3 (as can be seen from the input offset adjustment trimpot) but the text on the PCB says R2... so sorry about the confusion.....
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Old 16th December 2012, 07:54 PM   #528
hesener is offline hesener  Germany
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Quote:
Originally Posted by FdW View Post
Yes I did, and I do not know what to say

The attached picture has your numbers in it, it is fed from the voltage you gave, it generates the output voltage you measured. Then I added your measured voltages (test points, Vbe’s and Vak’s of the LED’s) and I sat back and watched

And my conclusion is, I DO NOT UNDERSTAND IT

There are no Si based transistors with a Vbe of 0.2V (as calculated) or 347mV (as you measured).

The PSU is operating as expected, outputting +18.23V and -18.21V, the current sources seem to work. Now we need some smart person to figure it out.

Thats a good one... just spent 30min looking at the same picture, in wonder....

BTW, VBE of Q104 is -1.79V, not 1.79V. It should be fully off. Still, Q103 seems to be conducting, else there would be no output current. But it is doing something between open and short circuit, else V(TP103) would equal the input voltage.

@beetle:

Does this problem happen when you turn on the prereg voltage very quickly (e.g. plugging in a plug) or also when you ramp it slowly (with the voltage button of a lab supply)?

And, are you shure you have no solder joints on the bottom side where they are not supposed to be?

And, can you please check with a resistance meter between the collector tabs of all power transistors (when power is turned off, of course) to see if there is no short through the heatsink?
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Old 16th December 2012, 08:51 PM   #529
beetle is offline beetle  Germany
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Hello Alfred,
hello FdW,

Power transistors are isolated. I had to to this as I mounted them to the sink with screws. The mosfets are in a plastic case so not needed here. But to make sure, I measured 6MOhm from GND to metalcase.

My soldering looks good. But to make extra sure, I'll wash the PCB in alcohol tomorrow.

At 21V both currents are 130mA.
24V: -138mA, +147mA
26V: -147mA, +161mA
28V: -151mA, +170mA
30V: -155mA, +178mA


Thanks for your help.
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Old 16th December 2012, 08:51 PM   #530
hesener is offline hesener  Germany
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@ beetle:

Sorry, one more question: Are you sure and certain you put BC337 in for Q102 and Q104, and not BC327? I know you checked 4 times but these are below the heatsink so they may be difficult to see....
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