Re: -5 volts?
From: SCADA (SCADA_at_optonline.net)
Date: 02/10/05
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Date: Thu, 10 Feb 2005 18:31:57 -0500
"DaveC" <bobason456@hotmail.com> wrote in message
news:Xns95F9F07046803ohirohotmailcom@38.119.85.36...
> Hello.. I've built a little Guitar effects circuit, Its basic
> configuration is as follows Input -> LM741(variable Gain) -> ADC -> PIC
> -> DAC(MAX5354) -> output. I used a voltage divider to impose a 2.5 volt
> DC offset on the analog input of the OPAMP so I could get a clear reading
> as the signal swings in either direction.
>
> It all works fine, except that the 2.5volt offset is still on the output.
> Due more to the DAC then the above mentioned. Any way. I wish to power
> the whole thing of a regular 9 or 12 volt DC wall wart. So I need -5
> volts to pull the signal down again (removing the DC offset.
>
> Are they called charge pumps.? somthing? At the moment I only have the 5v
> digital supply and ground.
>
> Thanks.
>
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Have a look at the LMC7660...
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