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Chip Amps Amplifiers based on integrated circuits

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Old 2nd April 2005, 09:24 PM   #1
Anthrax is offline Anthrax  Australia
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Default Need help with LM3875 as bass amp

i've done a seach, and read through the pages about the "simple guitar amp" using a gainclone.

but i'm thinking of making a simple bass amp for practise.

using this schematic

http://circuitos.tripod.cl/schem/r78.gif

and then having a bass preamp go before it, with the bass guitar going into the preamp. would this work ? will there be any changes to be made in the power amp section to accomodate for the more bassy'er input ?

any help would be awesome.
also, what voltages should those caps be ?
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Old 2nd April 2005, 09:33 PM   #2
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As bassguitar amp it will be quite OK, you can't change values of devices. You must use caps for 35 V DC.
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Old 3rd April 2005, 11:32 AM   #3
Anthrax is offline Anthrax  Australia
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thanks for the reply. i have one last question.

can anyone suggest a good PSU for that particular design ?
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Old 3rd April 2005, 01:44 PM   #4
edl is offline edl  Hungary
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let's see the NFB.
the RC's are: 1Kohm and 10uF. this gives 16Hz...
for bass guitar, it won't be good! the freq response will starts at 30-40Hz!
let's use a 47, 100, or even a 220uF capacitor there!
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