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Old 1st January 2013, 11:06 AM   #701
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Join Date: Dec 2006
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Hello guys and a happy and healthy new year.

Yesterday I found a little time to try a first seating test in the enclosure,
I have taken 2 pics

[IMG]Click the image to open in full size.[/IMG]
Click the image to open in full size.


I beg you all to have a look at my posting #682, where I told of my 3 problems. I have no idea what to do to fix them.

I truly like to run my paradise,

regards,
Christoph
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Old 1st January 2013, 11:35 AM   #702
PMA is offline PMA  Europe
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Christoph, if the layout you have shown is a MC preamp, it must have hum and buzz like a hell. MC preamp is one of the most difficult audio components regarding wiring, shielding, grounds, pickup of magnetic field from transformers. I hope someone who designed this project would also give some recommendations and construction hints. My hint is to keep the input of the MC preamp as far as possible from any transformer and avoid any loops (loops of analog ground).
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Old 1st January 2013, 03:05 PM   #703
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For those who have Fairchild BC327 and BC337 devices, measurements below show they can be matched with devices from ON Semi purchased from Digikey. Now that this is done, it is time to return to my Paradise build.


hFE*
(mV)
BC337-40
Fairchild
NPN
BC337-40
ON Semi
NPN
BC327-40
Fairchild
PNP
BC327-40
ON Semi
PNP
595-6008
595-6008
590-5958
585-59012
580-58510
575-58014
570-57522
565-57015
560-56518
555-56011
550-55511
545-5501412
540-5454511
535-5403610
530-535148
525-530277
520-5253710
515-520702
510-51570
505-51080
500-505361
495-50016
490-495
485-4901
480-4852
475-4801
470-4751
465-4702
460-46581
455-46061
450-455103
445-45013
440-44593
435-44086
430-4351210
425-4301915
420-425612
415-4201527
410-4151933
405-4102123
400-4052422
395-4002913
390-39513
385-39019
380-38511
375-38015
370-37522
365-37034
360-36536
355-36038

*hFE approximation using the circuit shown in Post #72. All measurements made at room temperature with fan blowing on transistor.

Happy New Year to all!
Pierre
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Old 1st January 2013, 05:00 PM   #704
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by brozatus View Post
Hello guys and a happy and healthy new year.

Yesterday I found a little time to try a first seating test in the enclosure,
I have taken 2 pics

[IMG]Click the image to open in full size.[/IMG]
Click the image to open in full size.


I beg you all to have a look at my posting #682, where I told of my 3 problems. I have no idea what to do to fix them.

I truly like to run my paradise,

regards,
Christoph
Did you leave it connected for some time ?

Output offset should go down after caps settle.
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Old 1st January 2013, 05:12 PM   #705
PMA is offline PMA  Europe
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Quote:
Originally Posted by RCruz View Post
Did you leave it connected for some time ?

Output offset should go down after caps settle.
Do they really need to to "settle"? I guess I have built hundreds of DC servos and caps never needed to "settle". They only needed to charge during RC time constant, this should last no more than seconds with max. like 10s.
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Old 1st January 2013, 05:35 PM   #706
hesener is offline hesener  Germany
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Quote:
Originally Posted by PMA View Post
Do they really need to to "settle"? I guess I have built hundreds of DC servos and caps never needed to "settle". They only needed to charge during RC time constant, this should last no more than seconds with max. like 10s.
The "settling" that happens is the input caps (elcaps, connected in series with the cartridge and they have DC). It actually is like Ricardo is describing, let them settle (turned ON) for a couple weeks and see what happens
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Old 1st January 2013, 05:35 PM   #707
chiily is offline chiily  United Kingdom
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Default Fun and games...

Just been putting together the first board of a Paradise brace and I'm having a couple of problems.

The power supply side is working fine, providing the +/-18V quite steadily.

I'm measured voltages at the test points as in the pdf for the schematic linked in this thread. The picture below (which may be a little large, but lots of detail!) shows the results.

Shame the text is too small

Click the image to open in full size.

I firstly had a problem with a couple of solder bridges on transistors, I've highlighted those. I did power the board with the bridges in place so the transistors may be damaged. I removed the bridges, but not the transistors.

I misplaced a BC327 instead of a BC337 (Q51 I think - don't know my way around the board yet!). Again, I powered the board before I spotted the problem.

The problems I'm seeing are:

Output is at -10.9v

The EXT RIAA is at -12.5V

TP9/TP10 measure at -13V

Q22 (BC327) and Q18 (BC327) run very hot, can't touch for more than five secs.

Additionally:

TP5/TP6 measure at 16.5V
VCASCH is 14.4V
VCASCL is -14.4V

All three are inline with the published schematic.

I'm tempted to just replace all the transistors in the centre current sources, starting with the BC337, as that is where the voltages are incorrect.

Grateful for any hints and guidance

Thank you.
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Last edited by chiily; 1st January 2013 at 05:47 PM.
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Old 1st January 2013, 05:37 PM   #708
hesener is offline hesener  Germany
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Quote:
Originally Posted by brozatus View Post
but I have ca. 5 V at pin 6 of the opa134 (should be around 0,5 V), on both of my boards.
Don't know how to fix this.

Christoph
thats not a big problem, it is the servo compensating the offset of the amplifier. 5V is high but still within the capabilities of the opamp. I would suggest to let it settle another two weeks turned ON and see what happens, eventually this voltage will come down or at least become stable.
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Old 1st January 2013, 05:39 PM   #709
hesener is offline hesener  Germany
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Quote:
Originally Posted by PMA View Post
Christoph, if the layout you have shown is a MC preamp, it must have hum and buzz like a hell. MC preamp is one of the most difficult audio components regarding wiring, shielding, grounds, pickup of magnetic field from transformers. I hope someone who designed this project would also give some recommendations and construction hints. My hint is to keep the input of the MC preamp as far as possible from any transformer and avoid any loops (loops of analog ground).
PMA, your advice is good (as usual ).

Guys please check the assembly guide, it has my arrangement as an example, worked fine for me and is very low noise. I do use an external pre-regulator (as most of the builders are probably looking at doing anyway).
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Old 1st January 2013, 05:42 PM   #710
PMA is offline PMA  Europe
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Quote:
Originally Posted by hesener View Post
The "settling" that happens is the input caps (elcaps, connected in series with the cartridge and they have DC). It actually is like Ricardo is describing, let them settle (turned ON) for a couple weeks and see what happens
Thank you for the explanation, anyway it is quite unhappy solution to put elcaps between the cartridge and input of electronic circuits. What is the reason, is there any input bias current flowing into input?? I would always try to avoid elcap coupling capacitors. Sorry to say that but this might be a serious design flaw here and look how the guys complain.
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