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VSSA Lateral MosFet Amplifier

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bimo

bimo

Member
Joined 2010
anistardi.wordpress.com
This is my version of VSSA. I uses CCS (bjt). It sound like "live". Thank you, LC.
 

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Lazy Cat

Lazy Cat

Member
Joined 2007
Last call for missed GB members

Lazy Cat said:
badrisuper 2 PCB set
JethroTull 2 PCB set
milandks 4 PCB set
tjencks 2 PCB set
quanghao 2 PCB set
audionootje 4 PCB set
Meganinja 2 PCB set
gnat 2 PCB set

I kindly ask above listed remained GB members to send their address to:

esl@siol.net

Please prepare your address information in most exact form, like this:

1. line: Your diyAudio Forum Name (very very important)
2. line: Company Name (if not any please skip this line)
3. line: First Name Second Name (family name)
4. line: Street Name Street Number
5. line: Street or District Name (if not any please skip this line)
6. line: City Code Number (postal number) City Name
7. line: Province or State Name (if not any please skip this line)
8. line: Country Name
9. line: e-mail address (very very important)

I will prepare the Proforma Invoices for all of you already sent addresses, latest tomorrow.

Regards, L.C. :cheers:
Click to expand...

Last call for these 8 GB members. :yes:

Who will jump instead of them? :xfingers:
 
Lazy Cat

Lazy Cat

Member
Joined 2007
pinnocchio said:
Hi LC,

What was the price per module again?

Thanks
Do
Click to expand...

It is the same from the very beginning and that is 38,00 EUR for:

VSSA mosfet amplifier PCB SET, ESL
- VSSA PCB with pre assembled SMD parts (1 pcs.)
- ALF08NP16V5 (1 pcs.)
- KSA1381 (1 pcs.), KSC3503 (1 pcs.)
- BC550C (1 pcs.), BC560C (1 pcs.)
- kapton insulator washer (1 pcs.), polyamide spacer (2 pcs.)

Regards L.C.
 
Lazy Cat

Lazy Cat

Member
Joined 2007
In a few VSSA amps already made by me, the best results came out of tuned-up SMPS400A180 from Hypex. All capacitors changed to Panasonic FR, mains smoothing caps also enlarged to 2 x 1500 uF/200 V, NTC shorted with Shrack 16 A relay after 2,5 s from turn ON. Explore in SMPS world. ;)

Lower PSU voltage will bring less output power, less idle power dissipation, also input pair Vce is lower, meaning higher Cbc and little recessive transient response. ;)
 
BYRTT

BYRTT

Member
Joined 2009
Lazy Cat said:
Always dual mono configuration, one SMPS400A180 per one VSSA amp channel.
Click to expand...
Hi Andrej
Your final build of stereo amp is very very nice.
Do you have advice, i am sitting here with two times recommended Hypex ready for VSSA and preparing test setup. When i see your nice symetrical wiring, i think it looks perfect, but have 2 quistion anyhow.
First the Pos/Neg rails could have shorter leads (less z) if rail-connection hypex side face against VSSA, is this shorter leads better or does'nt matter.
Second manual of hypex does'nt mention anything about radiation noise fields around the unit, is it allowed to be close to anything without pollution.
I wish you best luck and practice for final paperwork/shipping for all that units. :c_flag: :D
Regards Ricky
 
Lazy Cat

Lazy Cat

Member
Joined 2007
Hi BYRTT

I think that modules arrangement in a case is optimal. EMI is undetectable in the VSSA output signal. Lenght of the supply wires is not an issue, first modules layout according to dissipation/EMI rules, wiring in secondary plan.

SMPS400 causes very low EMI field around, probably less influence/interferences than few hundred VA classic transformer. Never noticed any EMI related issue to VSSA.

Thanks for a good wishes. Regards L.C. :cheers:
 
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