<div dir="auto"><div>I'm going to assume without evidence that it's a Siemens Taurus locomotive. (Search for videos of <span style="font-family:sans-serif">Siemens Taurus singing locomotive.</span>)</div><div dir="auto"><br><div class="gmail_quote" dir="auto"><div dir="ltr">On Tue, 28 Aug 2018, 12:50 Adam Inglis, <<a href="mailto:21pointy@tpg.com.au">21pointy@tpg.com.au</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">We’re gonna need more details about the train…<br>
<br>
<br>
> On 28 Aug 2018, at 7:30 PM, Declare Update <<a href="mailto:declareupdate@gmail.com" target="_blank" rel="noreferrer">declareupdate@gmail.com</a>> wrote:<br>
> <br>
> Howdy list,<br>
> <br>
> I’m on a long train in Japan, just thinkin’ about synths, as usual.<br>
> <br>
> Does anyone have any experience using filtered PWM to control the amplitude of a “normal DCO”, ie with a transistor shorting the cap on an integrator? Looking at the Juno 6 schematics, I see they used a 7-bit DAC to feed the integrator. Some napkin/train math tells me I could use 8-bit PWM at about 90khz (easy on stm32), filter it at 9khz, and control the amplitude just fine. I’ve been using real DAC outputs of fancier chips to do this recently, which works great, but if PWM is fine then I could do 2-4 voices on $0.50 chip ¯\_(ツ)_/¯ <br>
> <br>
> anything totally wrong or silly about this? any experience here? <br>
> <br>
> Chris<br>
> Sent from my iPhone<br>
> _______________________________________________<br>
> Synth-diy mailing list<br>
> <a href="mailto:Synth-diy@synth-diy.org" target="_blank" rel="noreferrer">Synth-diy@synth-diy.org</a><br>
> <a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer noreferrer" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>
<br>
<br>
_______________________________________________<br>
Synth-diy mailing list<br>
<a href="mailto:Synth-diy@synth-diy.org" target="_blank" rel="noreferrer">Synth-diy@synth-diy.org</a><br>
<a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer noreferrer" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>
</blockquote></div></div></div>