VSSA Through-Hole-PCB build thread - diyAudio
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Old 28th October 2013, 01:07 AM   #1
PMI is offline PMI  United States
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Default VSSA Through-Hole-PCB build thread

I have been encouraged to put the technical information for this board and layout into a separate thread. I am hoping that this will become the build thread for the Rev C circuit board, and for anyone who has my earlier Rev B version.

To give credit where it is due, the circuit design is from Lazy Cat's main VSSA thread, and inspiration for the through-hole version from Shaan and the PeeCeeBee thread. Most technical discussion and original schematics can be found there.

Schematics and BOM for the latest version will be posted here.

*** Revision C Latest Schematic and BOM ***
*** Dimensions and Mechanical Drawings ***
*** Notes on components and costs ***

This is my third VSSA version using all through-hole parts. 4th including the SMD modules from Lazy Cat... !

The main differences compared to the last revision are options for higher supply voltage and power, and options for better component and heatsink selection.

New in this revision:
  • Up to 100W/channel w. +/-45V supply and specified components, and 125W/channel w. some substitutions and higher supply rails
  • More space for larger electrolytic decoupling and filter caps
  • VAS transistors top-side or bottom mounted (see 3D models below for comparison)
  • More space for bigger top-side heatsinks, or a common VAS heatsink.
  • Optional Jfet CCS (recommended above about +/-37V supply voltage)
  • TO-3P (Renesas Latfet) or TO-247 (Semelab Alfet) devices supported
  • Pads for protection diodes for ALF08P/N16-20
As of 3.11.2013, first circuit boards have been tested.
Some of the test results have already been posted to the PeeCeeBee thread, the rest will be posted here soon.

I am hoping that this will become the build thread for the Rev C circuit board, and for anyone who has my earlier Rev B version.

I will do my best to keep this thread updated with test results and documentation, but new options and ideas appear in the PeeCeeBee thread almost daily, so please check there as well.

My thanks to Shaan, Lazy Cat, and various other people for their suggestions.
Special thanks to Ivan Lukic for his feedback and helping to move things along.

Links to previous threads:

VSSA Lateral MosFet Amplifier
PeeCeeBee

*** Latest Update: 4.11.2013, First production boards have been ordered, ***
Attached Images
File Type: jpg VSSA1_top.jpg (129.8 KB, 3283 views)
File Type: jpg VSSA1_bottom.jpg (155.0 KB, 3155 views)
File Type: jpg VSSA1C_PCB1b.jpg (437.1 KB, 3089 views)
File Type: jpg VSSA1C_PCB2b.jpg (390.0 KB, 2962 views)
File Type: jpg VSSA1C_PCB3b.jpg (329.2 KB, 2875 views)
File Type: jpg VSSA_1C_assembly1b.jpg (326.3 KB, 872 views)
File Type: jpg VSSA_1C_assembly0b.jpg (341.3 KB, 1086 views)

Last edited by PMI; 19th November 2013 at 03:29 PM. Reason: Link to Mechanical Drawing Added
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Old 28th October 2013, 01:42 AM   #2
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Hey Pete,

Thanks; for starting this thread. It should help folks find things since the Peeceebee thread has become so long and has so many different layouts. You know you are dangling a big piece of meat in front of a starving dog don't you?

Looking forward to building this one.

Blessings, Terry
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Old 28th October 2013, 02:07 AM   #3
PMI is offline PMI  United States
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Didn't your inner dog just have a nice big steak, courtesy of Jason...?
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Old 28th October 2013, 02:11 AM   #4
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That was just a tidbit. Listening to it for days now has only increased the hunger.
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Old 28th October 2013, 07:48 AM   #5
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PMI, how does this differ from LC's design apart from the obvious (TH in preference to SMT).

Also wondering how you get 100wpc from only one pair of outputs. How does the power scale into 4R loads?
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Old 28th October 2013, 11:50 AM   #6
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Quote:
Originally Posted by still4given View Post
That was just a tidbit. Listening to it for days now has only increased the hunger.
I'll be curious to compare these with my own as well. Nice to have a proven layout that has all the options, so it can be compliant with the PeeCeeBee or a true through hole VSSA.

@ PMI - I suppose the inclusion of these options was the reason for the 'encouragement' to take this off the PeeCeeBee thread?
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Old 28th October 2013, 12:08 PM   #7
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Hi Pete, so this thread is very interesting...
all in one VSSA TH & SMD
there must be something new to discovered here.

Hi Ranchu,
The through hole part is easier to assembly...
the smd is not so difficult to assembly...
All is back to your parts availability & PMI know the original VSSA board by Lazy Cat is very hard to beat.

Hi Jason, I guess you should build another one & compare it to the rugged to-3 version that you already have.
Pete maybe will buy some Alfets & I might join with him

Regards
John
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Last edited by JOHN BALI; 28th October 2013 at 12:17 PM.
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Old 28th October 2013, 01:26 PM   #8
jarkaa is offline jarkaa  Finland
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I´ve had my peeceebee running for few months now and I have new pcb with css option on a drawing board also. I am following this thread with great interest.

Good work PMI
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Old 28th October 2013, 02:35 PM   #9
Bonsai is offline Bonsai  Taiwan
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Very nice looking layout PMI!
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Old 28th October 2013, 02:46 PM   #10
PMI is offline PMI  United States
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Quote:
Originally Posted by Ranchu32 View Post
PMI, how does this differ from LC's design apart from the obvious (TH in preference to SMT).
I should take this one first...

LC intended the VSSA module to fit into small spaces from the beginning, powered speakers, small multi-channel systems, etc. (so stated in his thread). I like space between components for rework, test leads, temperature probes and fat fingers...

The pic below shows the previous version and LC's module, mounted on same size heatsinks, side-by-side.
  • Input filter. Perhaps not required, but it is there, and I use it. LC's VSSA board is direct coupled.
  • Component values in the input, feedback, and CCS are a bit different.
  • VAS transistors are on top-side by default, on their own heatsinks, bottom-side as an option.
  • Output bias is set by two diodes, and if necessary can be adjusted with a parallel resistor, identical to Shaan's circuit (there is no TLVH431).
  • Finally and most important - the output is two conventional devices, N-channel and P-channel. LC designed for a single device with two complementary dies packaged in one TO-264.
Quote:
Originally Posted by Ranchu32 View Post
Also wondering how you get 100wpc from only one pair of outputs. How does the power scale into 4R loads?
The latfets clip as close as 3V below the rail (tested). 100W is clearly specified in LC's documentation for VSSA, with one TO-264 package, and 45V rails. So, if you have a correctly rated heatsink, and manage to keep two devices cool, it should do just fine.

You also need a reasonably clean supply, 45V with lots of ripple on top will be a no-go.

I actually look forward to some discussion about components, power dissipation, etc. in this thread. I tried to start some in the PeeCeeBee thread and did not get far.
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