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Old 30th November 2011, 06:58 AM   #3211
hesener is offline hesener  Germany
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multipcb is good. tried jackaltac and they are ok as welll.

Honestly, if I have the time to layout a PCB I prefer it any time over hand-soldering.... check attached picture for the underside of my starless build... it probably took me longer to handsolder than to layout a proper PCB.

What finish do you order for your PCBs? I prefer galvanic gold, but preferences may differ....
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File Type: jpg underworld.jpg (227.8 KB, 299 views)
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Old 30th November 2011, 07:10 AM   #3212
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Yeh, thats a labor of love, for one that killed his parents, as we say here.
I usually order black material with yellow letters, galvanic gold, vias, G200.
Here is my latest build. I can not make it work although i already debugged it many times.
I was so angry that i destroyed the first input stage until in found out that i fitted LM337
current sources instead of LM317 ? Still it does not work although i measured each and every part. That rarely happens, but it happens.
Attached Images
File Type: jpg Buf new PSU.jpg (101.5 KB, 287 views)
File Type: jpg Buf new underside.jpg (81.2 KB, 286 views)
File Type: jpg Buf new top.jpg (92.0 KB, 274 views)
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Old 30th November 2011, 07:17 AM   #3213
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Here is the best quality i can make. It is one channel of the Opus Magnum Phonostage.
The underside with be soldered again so that the joints look like half spheres and then it will be cleaned with alcohol.
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File Type: jpg Opus Magnum Phono upper side.jpg (117.2 KB, 249 views)
File Type: jpg Opus Magnum Phono underside.jpg (91.6 KB, 167 views)
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Old 30th November 2011, 09:35 AM   #3214
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This was the problem : a burned resistor in the pre regulator in an external box. Instead of 10 Ohm it had 850 Ohm. That was the reason i could measure the correct plus - minus 12 V after the regulator when the circuit was not connected. With the circuit the plus voltage went down to less the 2V. I thought the circuit is faulty ! This was a real classic that cost me several days to figure out.
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File Type: jpg Burned Resistor.jpg (72.9 KB, 148 views)
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Old 30th November 2011, 10:52 AM   #3215
MiiB is offline MiiB  Denmark
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I know about basic problems also... such as pin-out in TO92....I also hate the fact that there's no possible way of getting working LT-circuits imported into my eagle...and this manual transfer sometimes results in funny things...)

Whats the sound...i believe it's the n-channel starless...???
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Old 30th November 2011, 11:54 AM   #3216
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No, this is the "secret" buffer i send you. The first i build worked right away, phantastic.
That REALLY bugged me when the second one refused to function.
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Old 30th November 2011, 03:35 PM   #3217
MiiB is offline MiiB  Denmark
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And how is the second one.??
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Old 1st December 2011, 12:08 AM   #3218
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I am working on it. I think one channel works after i fixed the pre regulator. The other channel has 10V offset, hummm.
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Old 1st December 2011, 01:18 AM   #3219
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I got it working. A tansistor was connected wrong.
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Old 1st December 2011, 01:57 AM   #3220
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Here is the step response to a 100kHz square. Risetime is 170V per usec. This is with an input low pass filter of 300 Ohm, 150pF to suppress overshot
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File Type: jpg Step Response Secret Buffer.jpg (104.0 KB, 87 views)
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