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Old 17th December 2012, 12:19 AM   #541
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Old 17th December 2012, 12:58 AM   #542
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Old 17th December 2012, 06:36 AM   #543
FdW is offline FdW  Netherlands
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Old 17th December 2012, 08:24 AM   #544
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Old 17th December 2012, 03:02 PM   #545
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Has anyone got these phono boards to work yet?

Have these revised pcb's been built up and shown to work before we were sold them please?

I would have though that they would have been.
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Old 17th December 2012, 04:40 PM   #546
mibu21 is offline mibu21  Germany
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Quote:
Has anyone got these phono boards to work yet?
Yes, mine are playing since two weeks - and they do sound really sweet, open and - most important - donīt produce any noise.
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Old 17th December 2012, 05:28 PM   #547
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Originally Posted by mibu21 View Post
Yes, mine are playing since two weeks - and they do sound really sweet, open and - most important - donīt produce any noise.
Are yours the R3 boards and did you stuff them as per the values printed on the PCB?... no changes?
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Old 17th December 2012, 05:45 PM   #548
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Hi deadhead,
there are no others than the accidentially R2 labelled R3s out there.
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Old 17th December 2012, 07:46 PM   #549
beetle is offline beetle  Germany
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Originally Posted by FdW View Post
May be (but unlikely). The numbers (measurements) are very unreal, and I cannot understand them. The gain of the power transistors can be diminished (lowered in importance) by lowering the resistors R100 and R103 (they could be lowered to 22 Ohms).

But as I do not understand what is happening, I am a bit afraid to advice a thing like that (it could be that doing experiments like this does more harm than good).
Lets try it the other way. I have another board with the same issue. Here I also checked the stuffing billion times. Let's do a start over. Maybe I measured something wrong. Who knows.

Ok here we go again with the other board.

TP101: 19.66V
TP102: 17.89V
TP103: 23.31V
TP104: 541mV
V(in)=30.14V@186mA

V(L110): 1.92V
V(L111): 1.91V
V(L112): 1.91V


V(BE Q101): 649mV
V(BE Q102): 161mV
V(BE Q103): 634mV
V(BE Q104): 1.69V
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Old 17th December 2012, 07:53 PM   #550
beetle is offline beetle  Germany
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Damn it! Now I wracked something while measuring. I believe I short circuited Q104. LEDs L111 and L112 are off. Need to verify these values.
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