[sdiy] using a dac as a digitally controlled amplifier

[chris]

IIRC, the MCP4922 I used a lot (12 bits) is also just a large divider
chain and lots of switches.
4000 resistors isn't that much anymore...

Chris



On Mon, 5 Aug 2024 18:45:44 +0000 Mike Bryant
<mbryant at futurehorizons.com> wrote:

> 
> I think the digital pots are 256 resistors in a string with a MOSFET selecting each position, whereas the DAC use R-2R-4R-8R-16R-32R-128R feeding a summing amp.
> 
> 
> ________________________________
> From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mattias Rickardsson <mr at analogue.org>
> Sent: 05 August 2024 19:38
> To: Roman Sowa <modular at go2.pl>
> Cc: Synth DIY <synth-diy at synth-diy.org>
> Subject: Re: [sdiy] using a dac as a digitally controlled amplifier
> 
> Is this MDAC "trick" more or less equivalent to using a "digital potentiometer", or are those ICs significantly different?
> 
> /mr