2stageEF high performance class AB power amp / 200W8R / 400W4R

[thimios]

Just arrived

A lot of parts just arrived!
Thanks!
After a long period doing nothing,i'm busy again!
Waiting new boards for test and finalizing one amplifier at least...for now!
Not bad,not bad at all!

 

[thimios]

A new thread ,SA2015 V MOSFET Buiders has been start here.http://www.diyaudio.com/forums/solid-state/307972-sa2015-v-mosfet-builders.html

 

[astx]

A new thread ,SA2015 V MOSFET Buiders has been start here.http://www.diyaudio.com/forums/solid-state/307972-sa2015-v-mosfet-builders.html

Thats perfect! Added a link in the first post at "USERS BUILD"!

BR, Toni

 

[Project16]

I hope that this is the proper position for the inner baseplate.

Thimios

It is better to return your plate with holes because so you have a space between the bottom of the case to house the screws.

Regard's

 

[SGK]

Dear Steve,

yes - another good option. I personally use the services from schaeffer-ag.de
Any news about your new location - profile still shows London? Timezone?

BR, Toni

Sorry I completely missed this. We are still camped out in Vero Beach FLorida while we search for a house in Miami. Our household shipment arrived and cleared customs at Miami port but alas will go into storage for awhile.

 

[astx]

Dear Steve,

good to hear from you! Hopefully you will soon find a house to be able to finish your SA2014 amplifier . Think this will be the first known SA2014 build/finished in the USA!

BR; Toni

 

[astx]

SA20XX 4 channel backplane ...

... got new pcbs for a reworked 2 - 4 channel backplane:

• output zobel
• dual ground loop breaker
• dual star ground
• speaker relay
• galvanically isolated remote powering by 8 - 18V helper voltage
• USB port to configure the MCU
• 230x70mm

Needs external 12 - 15V DC or AC 150 - 300mA.

BR, Toni

 

[SGK]

Nice. The external supply could power the MCU as well. When are you going to integrate the MCU into your back panel?

 

[astx]

maybe for PCB rev. 3.x ...

 

[thimios]

Thanks!

New "mains inrush control" pcb: I2C library ported to pic16f1829.

Prototype is working:

• able to detect and feed data to LCD display
• able to detect and read up to 8 additional LM75 temperature sensors
• WIP for MCP23008 and MCP23016 port expanders

BR, Toni

Hi Toni,may i ask a question?
Is my housekeeping board compatible with this one in the LCD usage?

 

[astx]

Dear Thimios,

unfortunately not but is no problem because the LCD variant is only a proof of concept. currently of no use.

BR, Toni

 

[thimios]

Dear Thimios,

unfortunately not but is no problem because the LCD variant is only a proof of concept. currently of no use.

BR, Toni

Ok thanks.I will live without lcd

 

[astx]

SA2015 - 4 channel VMOS - stacked power supplies

... stacked power supplies ...
New 4 channel SA2015 VMOS amp will get 4 separated power supplies ...
One 800VA toroid with 8x35V secondaries

 

[Kay Pirinha]

Toni,

are you sure you'll have access to the fuses on the lower board after this stacking? I suppose there has to be a clearance of 35-40 mm between the upper edge of the empty fuse holders and the upper board (for 5x20 mm fuses, of course).

Best regards!

 

[astx]

4 screws and you will have access...
The fuses are for emergency only. not for every day replacement.

 

[thimios]

... stacked power supplies ...
New 4 channel SA2015 VMOS amp will get 4 separated power supplies ...
One 800VA toroid with 8x35V secondaries

Low profile capacitors gives the opportunity for stacked power supplies.
A lot of room saved for other boards.
Good work Toni!

 

[astx]

SA20XX 4 channel backplane ...

The new backplane for up to 4 speaker channels.

Note: Schematics are free to use only for non commercial DIY projects.

WARNING: I am not responsible for any costs, damage and/or injury using these schematics. Do not use this schematics if you do not have the necessary experience and knowledge.

 

[astx]

SA20XX 4 channel backplane ...

Note: Gerbers are free to use only for non commercial DIY projects.

 

[Kay Pirinha]

Hi Toni,

cool ! Do you also opt for a SS relay version?

Best regards!

 

[astx]

Dear Kay,

thx! Maybe never a SS relay because of added nonlinear distortions. Here I use Panasonic JJM1a or JJM1 with high current contacts with very low resistance.

BR, Toni