Mpp

[hesener]

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....

[Joachim Gerhard]

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.

[Joachim Gerhard]

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.

[Joachim Gerhard]

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.

[MiiB]

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...???

[Joachim Gerhard]

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.

[MiiB]

And how is the second one.??

[Joachim Gerhard]

I am working on it. I think one channel works after i fixed the pre regulator. The other channel has 10V offset, hummm.

[Joachim Gerhard]

I got it working. A tansistor was connected wrong.

[Joachim Gerhard]

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