1000W Simple PA Amplifier

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  • APEX B1200 Ver.1.2 Green.jpg
    APEX B1200 Ver.1.2 Green.jpg
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  • APEX BA1200 Rev.1.2 Gray.pdf
    APEX BA1200 Rev.1.2 Gray.pdf
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  • APEX BA1200 Rev.1.2 PCB Mirror.pdf
    APEX BA1200 Rev.1.2 PCB Mirror.pdf
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Balanced input, 30Hz 12dB/oct low cut filter, clip limiter, volume control, signal-power-clip-protect led display and +/-18V regulator all this circuit on single pcb thanks to Willy.

Heres the file's....
 

Attachments

Apex,

You have right, I have to give up the 2U high version. Unfortunately the toroids are so big (200mm dia, and 76mm high, 2kVA), and there is not enough space for the heatsinks 🙁
Maybe some downscaled version will born...


Sajti
 
tinitus,
What difference does the center tap and and 220nf caps make to the circuit. Will it be more positive as just not to use the center tap ?

just because of available trafos, series connected, thats all 😉

mile shows it like that for the highest power, for the same reason, available trafos

might be ok to use only one 220nf on each trafo
but someone suggested that series connected trafos should better have two 'snubber caps'
I think snubber resistors are still missing