[sdiy] Low voltage synthesis?

Tom Wiltshire tom at electricdruid.net
Fri Jan 14 12:27:58 CET 2022


Fantastic! Even less chance of any noise!

So Cheater is looking for ways to do low voltage audio with low noise and distortion, and all the examples we're finding are...digital!?! It's not really a surprise, is it?

> On 14 Jan 2022, at 11:19, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
> Cut out the middle bit :-)
>  
> BD28623MUV <https://www.rohm.com/products/audio-video/audio-amplifiers/speaker-amplifiers/bd28623muv-product>
>  
> These modulate the PDM directly from the I2S input, so there’s no analogue on-chip at all.
>  
> TI, ST, NXP and Infineon have similar parts for different power levels.
>  
>  
> From: Tom Wiltshire [mailto:tom at electricdruid.net] 
> Sent: 14 January 2022 10:27
> To: cheater cheater; cheater cheater via Synth-diy
> Cc: Mike Bryant
> Subject: Re: [sdiy] Low voltage synthesis?
>  
> I'd guess:
>  
> DAC -> Class D amp -> Outside world.
>  
> Not a lot of scope for noise in that very short signal chain.
>  
> 
> 
> On 13 Jan 2022, at 23:45, cheater cheater via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>  
> I wonder what's being used in places like
> mobile phones or wireless earbuds for example, they can't be running
> +/-5V op amps or LV op amps with major crossover distortion.

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