900W H-class PA Amp with Limiter

I found a errata on one of the bleeder resistor here is the updated file I might be wrong but I can see that there are two bleeder resistors connected on the same -120V spot is odd to me so I changed but the first files still the same so you can see what I mean

If you don't mind, maybe you can make another version with this diode.

Regards
 

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If you don't mind, maybe you can make another version with this diode.

Regards


I can do that sure 🙂 also yesterday I found out that the PNP transistor BF421 is obsolete and no longer available "they can be found on eBay well I rather change that" so I changed for KSP92 that have the same characteristics the only difference is the pins, the BF421 is E C B and the KSP92 is E B C so I have to update the PCB to accommodate the KSP92 and also MPSA92 can be use I will leave the update Sprint Layout 6 file here but, at the same time I will leave the original layout intact on the same file
 

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  • Apex H900 files.zip
    Apex H900 files.zip
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  • Apex H900 with PNP transistor KSP92.jpg
    Apex H900 with PNP transistor KSP92.jpg
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  • MPSA92-D.PDF
    MPSA92-D.PDF
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  • KSP92-889512.pdf
    KSP92-889512.pdf
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  • BF421-D.PDF
    BF421-D.PDF
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  • no longer available.JPG
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  • DigiKey.JPG
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I can do that sure 🙂 also yesterday I found out that the PNP transistor BF421 is obsolete and no longer available "they can be found on eBay well I rather change that" so I changed for KSP92 that have the same characteristics the only difference is the pins, the BF421 is E C B and the KSP92 is E B C so I have to update the PCB to accommodate the KSP92 and also MPSA92 can be use I will leave the update Sprint Layout 6 file here but, at the same time I will leave the original layout intact on the same file

I guess BF421 still produce by KEC Korea Electronic.
Why don't you design pcb for H900P, latest sch from Apexaudio?
It has more vas current and add vi limiter.
 
hi ya'll I decide to add the coil why not right? I'm not sure if this coil might be 10uH I think need to double the turns to double layer air coil 😛 I put some number and this can be a really expensive project to do but at least I have all the designs saved 🙂
 

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  • Apex H900 PRO with coil.jpg
    Apex H900 PRO with coil.jpg
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I'm confused about top rail comutation mosfets

Hi I think this might be the lat post about me studies of the Apex H900 and I was able to simulated and works really well a lot more power than what I really need it is capable of give more than 1200W to 4 ohms load the THD is high after it reach 1250W about 0.6% THD not bad I think the only thing that got me confused is that the +HV 120V the mosfets orientation the simulation results is weird if I place the D drain to +HV120 to be honest I'm not so familiar with mosfets so will this does not matter? 😕 I really don't want to made a mistake and change the layout clone I did if that does not matter please let me know



I think most be the simulation but I want to be sure
 

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