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Old 5th March 2013, 07:48 PM   #571
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Quote:
Originally Posted by buzzforb View Post
LAzy,
What SMD do you recommend. From what I understand, Susumu is popular. I used Vishay TNPW recently, as they are extremely low noise.
First two PCBs assembled have mostly low noise Vishay SMD resistors, Murata capacitors, pf range all RF grade, others KEMET and Panasonic.

For 10 uF Vishay is recommended, 2200 uF/10 V in feedback loop Panasonic or Nichicon, also the same with bigger elcos, PSU the same.

Mosfet is the one and only ALF08NP16V5 or there's some replacement present there in the universe.
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Old 5th March 2013, 09:47 PM   #572
myfi is offline myfi  United States
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I'd give er a go. 2 PCB for me
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Old 5th March 2013, 10:06 PM   #573
FelixG is offline FelixG  Germany
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Hallo LC,
great work - this little big amp!!! Before signing for 4 boards,
how thick will be the copperplating of the PCBs?
regards
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Old 6th March 2013, 12:54 AM   #574
ichiban is offline ichiban  United States
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If a pair of boards become available I would love the chance to build & hear this amplifier. So, please count me in.
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Old 6th March 2013, 05:17 AM   #575
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Hi Lazy
please count me in for 2pcs too
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Old 6th March 2013, 06:02 AM   #576
abetir is offline abetir  Philippines
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I am becoming fascinated with Lazy Cats SSA design innovations I figure this new circuit has truly adapted the norm “less is more” technology. Fewer parts count more capabilities. Is the design heading into miniaturization? Utilizing SMDs ?

Shaan’s vero board point to point combo assembly is truly an art form in DIY amplifier construction. I was amazed with his remarkable skills, I also am a DIY fanatic, and I always build it myself. I have seen offerings of PCB design in the course of the whole thread but none has shared the bottom copper for home etching. I understand KITS is in the offering, but I guess I will be doing a Layman’s job, I was wondering if the VSSA could also be offered to DIYers who are experiencing difficulties ordering abroad from their part of the world (call it custom related, financial matters or even timeframe). The circuit that uses 2Sk1058/2SJ162 was I think cost wise, the most affordable and easiest to build.

All I am saying is that, will there be a PCB files to be offered as DIY for home etching? So that we could also feel and hear the “magic” that this VSSA possesses. That is all.

Thank You!
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Old 6th March 2013, 06:02 AM   #577
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Quote:
Originally Posted by FelixG View Post
Hallo LC,
great work - this little big amp!!! Before signing for 4 boards,
how thick will be the copperplating of the PCBs?
regards
Thanks Felix.

2 mm FR4 double side plate has 15-20 um basic copper thickness, on top of that some 55-60 um will be added in a process of copper metallizing, so all together 70-80 um of copper on each side-layer. Since the tracks are very short and the ones conduct output current wide enough, that is just optimal.
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Old 6th March 2013, 06:34 AM   #578
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Hi abetir

I know one side layer vero boards are very popular since all the process can be made at home, but currently I'm not planning to design such a PCB. Along this thread few single layer PCBs were already presented, also with popular 2SJ/SK mosfets.

What we are dealing here strictly follows few basic rules of designing an amplifier, short tracks, optimal layout in almost P2P manner, simple topology but not simplest than optimal, latest technology of discrete parts available, all combined, results in a high bandwidth, low distortions, great output current transients, high PSRR - overall quality. Because everything is so small, 65% of a credit card, it is suitable to send anywhere to taste what can be achived with low costs, especially compared to costly hi-end gear. Also I think when custom service guys will see few parts and VSSA PCB, they'll accept an explanation that material is intended for educational purposes of youngsters in a school, at their technical education classes.
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Old 6th March 2013, 07:05 AM   #579
abetir is offline abetir  Philippines
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Hi Sir,

That was pretty quick.. The reason that I have asked was because I and my co-member in our local audio forum was thinking of presenting the VSSA, and we were discussing about the availability of the 5 pin ALF fet, coz it looks exotic and this could cause "drawbacks" from potential builders in our place but we will find that out soon. The plan is in progress...thank you for your quick reply...
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Old 6th March 2013, 09:42 AM   #580
shaan is offline shaan  India
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Quote:
Originally Posted by abetir View Post
I was wondering if the VSSA could also be offered to DIYers who are experiencing difficulties ordering abroad from their part of the world (call it custom related, financial matters or even timeframe). The circuit that uses 2Sk1058/2SJ162 was I think cost wise, the most affordable and easiest to build.
Hi abetir.

Thanks for the kind words. My humble P2P job with VSSA was a success and if it encourages others to build superfast amps on veroboard without worring about any ill effects then it's a worthwhile effort.

There will be a new thread with (yet another) layout of my new VSSA peeceebee with generic all throuh-hole parts and least headaches, for all my fellow diy-ers who might find it interesting, to etch for themselves.

Keep an eye on the index.
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