• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

VSSA Lateral MosFet Amplifier

Jump to Latest
C

CaféNoir

Member
Joined 2010
Lazy Cat said:
Complete silver metal case for VSSA+SMPS400A180 would come closely to 260 EUR + packaging + shipment costs. ;)
Click to expand...

Great! Put me down for 4 cases.

Also, I will take 2 VSSA PCBs, if there are still some left.

Thanks

Drsah said:
I saw those cases from Lazy cat: amazing work, and worth the every cent. I was browsing over net some time, and didn't find anything even close to that.
Click to expand...

I agree. It is very difficult to find decent DIY amplifier cases. Not to mention that the enclosure LC is offering will prevent from the hassle of tapping holes in the heatsinks. And it looks really nice!
 
Last edited:
P

PMI

Member
Joined 2013
BYRTT said:
This post for member "PMI" others to comment of course if any input, and is concerning his fluctuation/drift referenced in posts #2211 until 2221, and 2218, 2641, 2646, 2649, 2650, 2661, 2675. Hi Pete is it possible that the three screws going through the devices could be more or less magnetic dependant on manufacture brand. Could be tried with stainless stell or brass for non magnetic types. My thoughts are here that the electric field around the devices could easyer be transfered to board level components if magnetic ?
PS I stole this picture of your VSSA at the PeeCeeBee thread.
Click to expand...

@BYRTT: It is a mechanical problem. Sorry I wasted your time... :eek:

I normally check for this any time some reading seems "jumpy", but I did not do so this time, probably because the adjustment is already so sensitive to a small fraction of a turn. And, when you exclude the sensitivity, it now seems confined to one channel. When I tap the heatsink on one side of the chassis, or the edge of the module, the reading changes, although not necessarily immediately like you might expect from cold solder-joint, or broken wire.

When I am done playing around, I am just going to seal the screws with a drop of lacquer, and then leave it alone.

Perhaps I damaged the screw, who knows... I remember it seemed like a really tight fit, with the meter probes etc, and my little tweaker thingy kept slipping, so I had to use a tiny screwdriver (in restrospect, not recommended to do it this way).
 
P

PMI

Member
Joined 2013
Esperado said:
MAy-be you could do the following: Isolate the Boards from the heat sink ground, by using Canon isolators between the VAS screws and the board ground.
Verify Power device good isolation. Provide a good ground connection between Heat sink and chassis ground.
Click to expand...
My boards were isolated from the beginning, using standard M3 shoulder washers, and the ground was always a single-point ground. The original ground scheme which was made for dual supplies was not ideal for my single supply, because there was no easy way to break the loops. The chassis (earth) and the power ground are connected through a 20R-5W, although not really visible in the pics. The ground lifter on the modules works well in my case, so it is not bypassed. Diode mod will be done in a week or two, when I install a bigger transformer, and switch to a higher voltage supply rail.

Resistance to ground between all parts was checked when assembled. I posted pics of the chassis earlier, reposting w. more detail below.

I think we can close this as an issue, I appreciate all the suggestions received, thanks!!! :wave: :happy2:
 

Attachments

  • VSSA_w_PSU4B1.jpg
    VSSA_w_PSU4B1.jpg
    319.3 KB · Views: 517
  • VSSA_w_PSU4B2.jpg
    VSSA_w_PSU4B2.jpg
    358.4 KB · Views: 505
  • VSSA_Heatsink_Isolation2.jpg
    VSSA_Heatsink_Isolation2.jpg
    239.3 KB · Views: 498
  • VSSA_Heatsink_Isolation.jpg
    VSSA_Heatsink_Isolation.jpg
    221.5 KB · Views: 487
Nikitas

Nikitas

Member
Joined 2011
Esperado said:
Near all the numerous shops in Paris, where we could buy electronics components, made bankrupt.
Now, what a pain to find them on Internet, Mouser, Farnell and so on, and how expensive they are !
I cannot imagine the price of a DIY PC mother board by such sources !!!!
Click to expand...

Mouser/ Farnell are more expensive than physical shops? Really?!
I've been to Greece, Finland and Netherlands and at all these places physical shops are way more expensive than Farnell/Mouser. I mean more than double the prices.
 
Lazy Cat

Lazy Cat

Member
Joined 2007
VSSA PCB set GB officially ends

Hi guys :wave:

Officially the end of VSSA PCB set group buy. Last three parcels to send out today.

312 VSSA PCB sets sent all over the world in past 4 months.

Thanks for all your patience and support. :worship:

It is good starting ground and opening space for the next module which will come soon.

The name is First One and it will be ready made, assembled and tested to the last detail. It will be produced in thousands so no problems with waiting times.

Few reviews of ready made amplifiers based on the First One modules few posts back.

Coming soon.

Regards, Lazy Cat :cheers:
 

Attachments

  • VSSA last shipment.jpg
    VSSA last shipment.jpg
    521 KB · Views: 435
You must log in or register to reply here.
Top Bottom