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

Just arrived

A lot of parts just arrived!:cheers:
Thanks!:wave2:
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!
 

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astx said:
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? :radar:

BR, Toni
Click to expand...

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.
 
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
 
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
 

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Nice. The external supply could power the MCU as well. When are you going to integrate the MCU into your back panel? 😉
 
astx said:
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
Click to expand...
Hi Toni,may i ask a question?
Is my housekeeping board compatible with this one in the LCD usage?
 
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Dear Thimios,

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

BR, Toni
 
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
 

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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 said:
... stacked power supplies ...
New 4 channel SA2015 VMOS amp will get 4 separated power supplies ...
One 800VA toroid with 8x35V secondaries
Click to expand...
Low profile capacitors gives the opportunity for stacked power supplies.
A lot of room saved for other boards.
Good work Toni!😉
 
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.
 

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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
 
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