Simple Class D/PWM amp

[Leolabs]

Does anyone has a schematic of a Class D/PWM amp with these features:
-DC12V battery operated.
-Using opamp,Cmos logic gates,normal medium power transistors...
-Circuit simple enough.

????????????????????

[IVX]

Seems You want to have inconsistent requirements.

ps: i'd done something once, check this out on the my w.page.

[sfx]

my class D amp
...very simple, BCA full bridge (good for single-sided 12V operation). Instead of the Opamp triangle wave generator, I recommend using an integrated function generator (like the XP2206), which is simpler and gives much better waveforms. Instead of two inductors, it's probably better to wind your own, center-tapped inductor, preferrably on an air-gapped core.
Don't expect too much regarding audio quality - it doesn't have any feedback. But hey, it's simple! and it successfully drove my 150W 12" subwoofer for quite a long time, until I damaged it by fiddling around with it...

If you're after HiFi audio, you are probably better off with a UcD design. There is a thread here
Development for a Reference Class D starting point

(it's worth reading the whole thing, though the link skips to the matured schematics)

On the topic: has anyone a schematic of how to build the simplest self-oscillating amplifier ever? Most UcD designs I've seen up to now use lots of discrete components - I guess the component count can be reduced by using integrated circuits. It doesn't have to be great sound quality - I just think it might be great for people who just want to play around with class D. It should be possible to build a self-oscillating amp with nothing more than a few opamps/comparators, a MOSFET driver, 2 MOSFETs and the filter.

[Kenshin]

you can make a self-oscillating one with a single 555 timer
as schmitt trigger.

40106 plus transistors are also OK.

for any of them,remember to connect clamping shotekky diode at the output of switching stage.

Originally posted by Leolabs
Does anyone has a schematic of a Class D/PWM amp with these features:
-DC12V battery operated.
-Using opamp,Cmos logic gates,normal medium power transistors...
-Circuit simple enough.

????????????????????

[tiki]

What about SODA, or similar?
Comparator+driver+FETs+post-filter feedback, may be very simple.
Regards, Timo

[tiki]

edit time expired...
Here is the design, I used for "my" fast heater control. The FET driver is a HIP2101 instead of the EF pair.
Regards, Timo

[olugbenga]

pls i need a site where i can get all the info on building a class D amplifier.

[dmfraser]

There are some Class D DIY projects at www.schematicsforfree.mattsoft.net in the Audio\circuits section. Some are partial schematics but there are several complete construction projects as well.

[Leolabs]

Thanks

[djQUAN]

sfx,
I'm thinking about building your class D amp. (just had to check if ir2112 is available here locally.)

I already have the plans to upgrade the mosfets to higher current ones and run it off a 50V car SMPS or would it be possible to run that at 50V without mods? also adding some input stage to add feedback. it will be driving 4 ohm subwoofers. at 50V I could be getting about 300W RMS per channel with those.