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"No zipper noise?"<br>
<br>
Oh, I only used that on prototype boards, and yeah it had some
noise there.<br>
I hadn't thought about that coming from the switching, I assumed
it was SPI and my "wild wire" board and that a proper PCB layout
may cure that.<br>
Also I personally don't care that much at least for the simple
synth designs where I don't modulate resonance, so the noise would
be only there on setup, not playing, and since it's not commercial
and does not need to seem super polished, oh well ;-)<br>
<br>
So I guess that reduces the use of that for some people, unless
such noise can be alleviated with some external circuitry.<br>
<br>
Steve<br>
<br>
Am 27.06.2016 um 20:50 schrieb Vinicius Brazil:<br>
</div>
<blockquote
cite="mid:CAF7fC2BqFzwEFpyg5dB7UKgmbTtMD+kQB2BNTAR8qk13jpfdag@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Steve,
<div><br>
</div>
<div>No zipper noise?</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Jun 27, 2016 at 2:06 PM, <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:sleepy_dog@gmx.de" target="_blank">sleepy_dog@gmx.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Reading the thread "non-mechanical switching solutions",<br>
I just remembered a nice series of digital potentiometers
which I discovered some months ago,<br>
which are SDIY friendly ( for those not afraid of TSSOP ;)
), as they<br>
- support +/- 18V dual rails<br>
- digital voltage: 2.7 ... 5.5V (or even 1.8V)<br>
- cost less than 2 bucks<br>
<br>
I have used, as an experiment, digi pots in some VCFs to
easily control resonance from an MCU, but before I found
those here, I only knew similar products in a price range of
8...12 US$ or something like that.<br>
<br>
So I just thought, I'll throw that in here, maybe someone
else also only knew the expensive ones.<br>
<br>
MCP41HVx1 series, where<br>
<a moz-do-not-send="true"
href="http://www.tme.eu/de/details/mcp41hv31-503e_st/digitalpotentiometer/microchip-technology/"
rel="noreferrer" target="_blank">http://www.tme.eu/de/details/mcp41hv31-503e_st/digitalpotentiometer/microchip-technology/</a><br>
<br>
available in 5k, 10k, 50k, 100k<br>
<br>
datasheet<br>
<a moz-do-not-send="true"
href="http://www.tme.eu/de/Document/8b361619149495099964ddab197bebfe/mcp41xvx1.pdf"
rel="noreferrer" target="_blank">http://www.tme.eu/de/Document/8b361619149495099964ddab197bebfe/mcp41xvx1.pdf</a><br>
<br>
<br>
regards,<br>
Steve<br>
<br>
<br>
Am 27.06.2016 um 16:27 schrieb Vladimir Pantelic:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
On <a moz-do-not-send="true" href="tel:27.06.2016%2016"
value="+12706201616" target="_blank">27.06.2016 16</a>:15,
Pete Hartman wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
First thought: CD4052, but that doesn't work well in
practice at all.<br>
<br>
Second thought: DG409, better characteristics, but that
still doesn't<br>
work sufficiently well.<br>
<br>
Dig around a while for why.... aha, the on resistance
for both is<br>
significant, especially for the capacitive stages of a
ladder filter.<br>
The DG409 has on the order of 100R - 120R. Too much,
and confirmed to<br>
be the issue by comparing physical connections with wire
to physical<br>
connections with 100R resistors.<br>
</blockquote>
ADG1414, R_on = 9.5R and 8 switches inside one package -
but needs SPI<br>
so you need to add a 50¢ uC to control it<br>
<br>
<br>
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</blockquote>
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