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Chip Amps Amplifiers based on integrated circuits

85V rails at Lme49830 IRFP240/IRFP9240 amp
85V rails at Lme49830 IRFP240/IRFP9240 amp
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Old 14th January 2021, 10:33 AM   #11
giaspyr is offline giaspyr  Greece
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I have your SA2012 PCBs finished populated with their components too, the only reason I chose to use the ones I posted above is the extra pair of IRFPs that I hope it will give me the extra something for the use of the amp to drive pairs of 9" woofers.
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Old 14th January 2021, 11:51 PM   #12
JMFahey is online now JMFahey  Argentina
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What astx said.

Including keep the MosFets, forget Bipolars here, use driver IC as intended.

Good luck with your project.

Only point that worries me is:
Quote:
pair of 9" woofers whose impedance @20-300Hz ranges from 3.5 to 6.0 Ohm
which makes me fear:

Click the image to open in full size.

Those are 4 ohm woofers, so use them in series for 8 ohm per pair.
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Old Yesterday, 12:04 AM   #13
giaspyr is offline giaspyr  Greece
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Thanks JM, I'll go for a new trafo with dual 0-50VAC secondaries, as for the woofers they are in parallel and not 4Ohm each, speaker's impedance drops only down to 3.5/3.2Ohm @30 and 100Hz according to the graph.
Click the image to open in full size.

Last edited by giaspyr; Yesterday at 12:14 AM.
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