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Old 15th February 2013, 05:47 AM   #391
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Originally Posted by Lazy Cat View Post
VSSA PCB in production. I'll assemble and test first two as working amplifier and if everything works out fine, group buy can be organized in a new thread.
Now SMD parts will be ordered and before first PCBs arrives I'll prepare assembly documentation.
As you said, the sound is really good. Are we going to expect a group buy soon to hear the sound of the VSSA Amplifier? I'm just excited to try.
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Old 15th February 2013, 06:01 AM   #392
shaan is offline shaan  India
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:VSSA once set (trimmers measured and replaced with resistors) holds on to +/- 1mV (true), needs no DC servo at all.
I just paralleled a 200k resistor with the negative 10k current injector. Now offset is -1mV. Steady, unaffected by heat. This is a major win for the SSA line.
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Old 15th February 2013, 06:49 AM   #393
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As you said, the sound is really good. Are we going to expect a group buy soon to hear the sound of the VSSA Amplifier? I'm just excited to try.
Yep Lazy, Yet no more choice you have practice to much teasing about it...

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Old 15th February 2013, 08:25 AM   #394
Jay is offline Jay  Indonesia
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This is a major win for the SSA line.
Expect to discover more in the near future
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Old 15th February 2013, 09:55 AM   #395
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I lazy, Can you take some picture how you deal with trimmpod tunning (how you solder it an so small area..)

Marc
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Old 15th February 2013, 11:36 AM   #396
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Interesting implemenation of PSU boards Great job


How hot got heatsink?
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Old 17th February 2013, 09:02 AM   #397
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As you said, the sound is really good. Are we going to expect a group buy soon to hear the sound of the VSSA Amplifier? I'm just excited to try.
That's possible of course, lets say PCB and semiconductors in the package. For that purpose I would have to prepare some sort of installation instructions documentation.
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Old 17th February 2013, 09:11 AM   #398
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I lazy, Can you take some picture how you deal with trimmpod tunning (how you solder it an so small area..)

Marc
First solder cca. 15 mm pins onto SMD pads than trimmers to pins, when trimmed to correct output DC offset/VAS bias, cut and unsolder the pins. Measure the value and calculate which two values of standard resistors in parallel are close as possible to the correct value. In my case 1,2 k and 39 k in parallel gives 1,641 k and that delta is only 10 ohms away from desired 1,631 measured value.
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Old 17th February 2013, 09:17 AM   #399
tinitus is offline tinitus  Europe
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wont hurt to make it a few mm bigger
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Old 17th February 2013, 10:20 AM   #400
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In my case 1,2 k and 39 k in parallel gives 1,641 k and that delta is only 10 ohms away from desired 1,631 measured value.
Typo: 1,1641 k and 1,1631 are correct calculations.
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