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Old 18th January 2005, 11:31 AM   #1
Leolabs is offline Leolabs  Malaysia
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Default Simple Class D/PWM amp

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.

????????????????????
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Old 18th January 2005, 06:23 PM   #2
IVX is offline IVX  Russian Federation
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Seems You want to have inconsistent requirements.

ps: i'd done something once, check this out on the my w.page.
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Old 14th February 2005, 07:11 AM   #3
sfx is offline sfx  Germany
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Default Here's one...

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.
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Old 14th February 2005, 07:40 AM   #4
Kenshin is offline Kenshin  China
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Default Re: Simple Class D/PWM amp

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.


Quote:
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.

????????????????????
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Old 14th February 2005, 03:04 PM   #5
tiki is offline tiki  Germany
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What about SODA, or similar?
Comparator+driver+FETs+post-filter feedback, may be very simple.
Regards, Timo
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Old 14th February 2005, 03:37 PM   #6
tiki is offline tiki  Germany
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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
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File Type: pdf hysteretic_modulator_002_.pdf (9.5 KB, 744 views)
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Old 20th February 2005, 04:11 AM   #7
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Default class d amp

pls i need a site where i can get all the info on building a class D amplifier.
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Old 24th February 2005, 11:18 PM   #8
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Default Class D Plans

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.
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Old 25th February 2005, 05:26 AM   #9
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Thanks
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Old 1st March 2005, 08:20 AM   #10
djQUAN is offline djQUAN  Philippines
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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.
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