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-   -   Big-t (http://www.diyaudio.com/forums/class-d/89018-big-t.html)

djQUAN 25th October 2006 04:35 PM

Big-t
 
2 Attachment(s)
my biggest T-amp. :)

I designed it to do 600W per channel into 2 ohms based on 41Hz's amp8.

note: first time to attach pics so hopefully it would come out.....

(edit: it did come out....good! :) )

the case is estimated to be about 7" wide, 29" long and slightly taller than 2".

this will be a big car amp.

djQUAN 25th October 2006 04:38 PM

2 Attachment(s)
dual toroid SMPS with 14 IRFZ44 fets, 60A ixys rectifiers, four 6800uF primary side caps, and 10,940uF per rail on output side

djQUAN 25th October 2006 04:43 PM

2 Attachment(s)
control PCB which has the aux SMPS for +/-15V for the op amps, 5V for the logic control (delayed signal for mute) and the amp8 chipset. also has preamp for added gain for weak sources and bass boost. :) also has a temp control for the fans soon to be added in the final case.
(red cap used for covering LED......too much glare. :) )

djQUAN 25th October 2006 04:46 PM

2 Attachment(s)
close up of amp8 board

note: have not installed a heatsink for the driver chip....the result? it got too hot even if the chip slug was soldered to the PCB.

djQUAN 25th October 2006 04:48 PM

2 Attachment(s)
and finally, the work bench

BWRX 25th October 2006 05:00 PM

Nice job! Looks like a beast. Did you make the SMPS and control PCB? What speakers do you plan on driving?

RX5 25th October 2006 05:11 PM

djQUAN,



nice workbench :D



keep it up!!

djQUAN 25th October 2006 05:12 PM

yep. the SMPS PCB has a small daughterboard that holds the PWM oscillator and driver (same with the aux supply) so the main PCB holds all high current stuff. the main PCB was drawn by hand.

main SMPS high current terminal blocks were hand made using hand tools. :) I can't find anything that could handle the current over here.

the control board was made using EAGLE and photoetching.

so far, I have tested it on full range and it sounds good. but it will be driving two Kicker comp VR subs in parallel 4 ohms bridged.

Baldin 25th October 2006 06:00 PM

Hi djQUAN

Really cool. :cool:
What controller are you using for the SMPS?

Great project ;)

djQUAN 26th October 2006 09:12 AM

the same circuit that I posted in my website (www.djquan.angelcities.com/smps.html) but with different mosfet drivers. the one I used in that SMPS used totem pole drivers.


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