Chip Amp for bass practice amp

Zero Cool · 26th January 2005, 11:25 AM

Im new to the whole chip amp thing. can anyone suggest a circuit, or point me to where i can find a schematic for easy to build chip amp that will produce at least 30 watts @ 8 ohms clean???

Thanks

ZC

BrianGT · 26th January 2005, 11:36 AM

Quote:

Originally posted by Zero Cool
Im new to the whole chip amp thing. can anyone suggest a circuit, or point me to where i can find a schematic for easy to build chip amp that will produce at least 30 watts @ 8 ohms clean???

Thanks

ZC

A simple LM3875 based chip amp will provide between 30-50w into 8 ohms.

Here is a link to the datasheet:
http://www.national.com/ds.cgi/LM/LM3875.pdf

--
Brian

Brett · 26th January 2005, 02:19 PM

Ditto what Brian said, but depending on the bass you might like to add a lower noise opamp at the front end with a pot in between to get some more gain and decent noise performance, but it depends on the output level of your bass. Some of my passive basses with Barts put out a really low level, and at the opposite extreme, my modified Alembic will drive a standard Pro poweramp to full output from the bass itself.

No need for PCBs, just wire it on a bit of perfboard.

azira · 26th January 2005, 04:29 PM

You'll probably want to add a little tone control in there too. Just add it onto the opamp front end or before it.
--
danny

Zero Cool · 26th January 2005, 05:17 PM

Thanks, I already have a pre-amp section with compression, eq, etc i just needed a simple, easy power amp.

I will take a look at the sheet.

ZC

26th January 2005, 11:25 AM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	Chip Amp for bass practice amp Im new to the whole chip amp thing. can anyone suggest a circuit, or point me to where i can find a schematic for easy to build chip amp that will produce at least 30 watts @ 8 ohms clean??? Thanks ZC

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26th January 2005, 02:19 PM	#3
Brett diyAudio Member Join Date: Jan 2002	Ditto what Brian said, but depending on the bass you might like to add a lower noise opamp at the front end with a pot in between to get some more gain and decent noise performance, but it depends on the output level of your bass. Some of my passive basses with Barts put out a really low level, and at the opposite extreme, my modified Alembic will drive a standard Pro poweramp to full output from the bass itself. No need for PCBs, just wire it on a bit of perfboard.

26th January 2005, 04:29 PM	#4
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	You'll probably want to add a little tone control in there too. Just add it onto the opamp front end or before it. -- danny

26th January 2005, 05:17 PM	#5
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	Thanks, I already have a pre-amp section with compression, eq, etc i just needed a simple, easy power amp. I will take a look at the sheet. ZC

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