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Old 24th May 2012, 10:45 AM   #1
tenny is offline tenny  Estonia
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Default Good amp project for my subwoofer ?

Well i need a good amp project for my sub, the plate amps are too expencive.
Sub is 4 ohm
For long time playing - 130w
For short time playing - 200w
I guess something like 150w amp would be good.
Can somebody help me ?
Thanks
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Old 24th May 2012, 11:31 AM   #2
AndrewT is online now AndrewT  Scotland
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You're in the wrong section.
Chipamps are limited to ~70W maximum
They are also limited in peak current capability.

Don't expect good quality and high power into a 4ohms speaker.

Switching amps are often recommended for bass duty, but I would recommend a discrete or an lme498xx based amplifier for good bass performance.
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regards Andrew T.
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Old 24th May 2012, 12:48 PM   #3
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prehaps you might post what you wanna power with it, it can happen that you do not even need 50 watts. Save the trouble of building an amp that is way way more pwerfull than you need.
at least thats my best advice..
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Old 24th May 2012, 02:15 PM   #4
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2 parallel lm3886 will power a 4 ohm sub just fine.
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Old 24th May 2012, 02:40 PM   #5
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Quote:
Originally Posted by marsvolta View Post
2 parallel lm3886 will power a 4 ohm sub just fine.
I'll second that. (It was going to be my suggestion too.)

Use a 25V transformer to give yourself about 39V on each rail. Be careful that you send the same signal to each amp and match up the gain resistors.
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Old 24th May 2012, 02:53 PM   #6
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But its still only 68 watts.

Two TDA7293 in parallel are supposedly rated to 140 watts output into 4 ohms.
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Old 24th May 2012, 03:03 PM   #7
tenny is offline tenny  Estonia
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I found project like this 100W LM3886 Parallel Stereo Power Amplifier
Its 50w @ 8 ohm
and 100w @ 4 ohm
I think that will do .
But the most expencive thing is transformer.
Only thing the regulator schematic is missing, but the good thing is the parts are listed .

Tekko
I checked out the TDA7293, if u put that to 4 ohm load it will be only like 70-80w real power .

Last edited by tenny; 24th May 2012 at 03:06 PM.
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Old 24th May 2012, 03:11 PM   #8
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parallel 3886 into 4 ohms is 100+ watts with 35v supply
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Old 24th May 2012, 03:18 PM   #9
tenny is offline tenny  Estonia
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Yes, but i don't have to build a regulator between power supply and the amp ?
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Old 24th May 2012, 03:21 PM   #10
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Actually it's better than 100W. Use 39V rails and 0R1 output resistors. Put a Zobel on the o/p, definitely. You can do without an L//R.

Your sub may be 4 ohms nominal but it will have a DCR of about 3.3. That gives you about 200W, depending on where you choose to pick the point vis distortion.

It will be plenty. Excursion will likely be your limiting factor, not power (though of course that depends on the unit and how low in frequency you are going to go.)
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