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Old 31st October 2005, 12:10 PM   #1
Wynand is offline Wynand  South Africa
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Default LM3876 for guitar?

Would I be able to use the LM3876 chip for a guitar amp?
If so would I be able to use the schematic in the datasheet, or would I need a buffer/preamp stage with or without gain.

I've tried to look around and couldn't find something to use.

If someone's got a relatively simple design I would love to see it.
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Old 31st October 2005, 04:27 PM   #2
matjans is offline matjans  Netherlands
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hi,

i'd use an opamp in front of a standard lm3875 based amp (if that's what you're thinking of).

take any standard opamp, give it a high input impedance, say ~500kohm, and some gain. schematics are everywhere
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Old 31st October 2005, 04:40 PM   #3
Nordic is offline Nordic  South Africa
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Hey Wynand, is lekker innie kaap vandag!!!!!!!!!
What speaker do you have?

I must say the basic inverted config is probably easier to put to together than the noninverted setup from the datasheet. Especialy with the mono 3875 version.
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Old 2nd November 2005, 05:26 AM   #4
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wynand

better use tda7294.they have better mid and up freq response.

lm series has good low freq response.it heavy on bass.
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Old 2nd November 2005, 08:26 AM   #5
Tarzan is offline Tarzan  Belgium
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Marshall is using the TDA7293 as power stage in various combos.
They are ok. Use a decent heatsink!!!
Zilog
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