Interesting schematic

[RX5]

Check out this little circuit! Any comments would be helpful as i intend to try this one out soon. It should be about 60w into 8ohms, and runs at 50khz. Notice the lack of output inductors?!? Should one be included even though the designer did not? There is a 'pulse shaping network' that looks like a zobel or snubber there, but...

spare_parts,


looks like a fun circuit to build... 😀 simple enough to build in an evening or two...

would love to build one myself...

maybe you could also post the complete article from where it originally came from..

Cheers!

 

[RX5]

DID the above(1st post) circuit... works OK! 🙂 but really needs some finishing touches..

> faster op-amp OR comparator ..

> I have "meT" -supply pumping- in action... haha bypass caps at amp was only 1000uFs...audible during low frequencies

> SHOULD use output LC filter..for wires longer than a few inches, to speaker/s

> MOSFET heat... totem-pole outputs PER mosfet gate...a must...

> add -some- deadtime




Cheers!!


PS. arent those zener/s at GATE , a good enough addition of deadtime?? 22R in series to them perhaps??

now where is my SIM......

 

[fredos]

Look at my old 1200 schematics, all improvement are already done, I think...This schematics is my muse for my first high power class D amplifier...

Fredos

 

[RX5]

want to make a SIMPLE(few parts) D-amp for my bike.. 😀

supply of +/-24V@2A from an SMPS of course...

 

[spare_parts]

RX5,
I had the same results with this circuit. If it is bridged, maybe this will solve the supply pumping. Just feeding an inverted audo signal to one half of the amp and put the load between the two should do it??? I have done this with analog amps, but don't really know if it works that simply with digital amps. Also, any suggestions for a faster opamp?
Here is as much or the original article as I can manage.

 

[RX5]

spare_parts.

sorry but Im not familiar with D-amps using comparators... have not experimented with it much...

the amps sounds BAD... or is it just me??

thanks btw for the attachment 🙂

 

[spare_parts]

RX5,
The amp does sound pretty bad, lol. I had hoped it would be ok for subwoofer duty... I am also interested in UCD type amps, can you share your schematics/ PCB layouts, etc?

 

[RX5]

there is ONE pdf file from philips regarding UCD amp... my scheme is close to that

 

[spare_parts]

Does anyone have a simple driver schematic that would allow the use of all N-channel parts?