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I'm not an expert, but I've spent dozens of hours looking at switch
specs over the past few years and know your pain. I haven't found a
decent cheat sheet for the nomenclature Digikey and others use
either (e.g. "off-(on)"). I spent another few minutes searching and
only reminded myself that the <a
href="http://en.wikipedia.org/wiki/Switch#Contact_terminology">Wikipedia
page</a> is still worthless for this nomenclature. Can anybody
reading this put us out of our misery?<br>
<br>
But don't buy that E-Switch part from Sparkfun, buy it from Digikey
as <a
href="http://www.digikey.com/product-detail/en/EG1218/EG1903-ND/101726?WT.z_cid=ref_octopart_dkc_buynow&site=us">EG1903-ND</a>
($13.69 for 25). This is the same switch I've been using for a
while. There doesn't appear to be the obvious, potentially smaller
SPST choice (the E-Switch data sheet doesn't show one). But I agree
100% with your heart: there is a much smaller press-on, press-off
switch out there some place. And this little slide switch we're
using is the pits as far as stuff splashing on it.<br>
<br>
I haven't found any smaller switches except for tactile momentary
ones, which you wouldn't want unless you wanted to try <a
href="http://www.eevblog.com/2012/03/30/eevblog-262-worlds-simplest-soft-latching-power-switch-circuit/">Dave
Jone's soft-latching switch design</a>. (Not recommending that as
a good choice for you, just as an FYI and maybe of interest to
others).<br>
<br>
I'll try to remember to bring the collection of tactile switches I
got to try out for a project a while back. It might give folks at
the next meeting some idea of the mapping between "X grams pressure"
and what that really feels like, as well as sizes, etc. <br>
<br>
Finally, we need a generic link to that Digikey switch you
mentioned: the URL in your msg isn't valid.<br>
<br>
-Pete<br>
<br>
<div class="moz-cite-prefix">On 09/14/2014 03:59 PM, Charles
McClelland wrote:<br>
</div>
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<div>To any switch experts,</div>
<div><br>
</div>
I have been looking for a small switch to turn on and off my
low-power board (less than 100mA) and have not found anything
great. Part of the issue is that the terminology of switches is
confusing: on-off, on-mom, off-(on), etc. and some of it must be
due to my last of skill in doing parametric searches on Digikey
and Mouser. I just know the switch I am looking for is out there
but which of the tens of thousands is it?
<div><br>
</div>
<div>I have been using<a moz-do-not-send="true"
href="https://www.sparkfun.com/products/102"> this</a> Single
Pole Double Throw (SPDT) power switch from Sparkfun. It works
well but it takes up space and I only need a Single Pole Single
Throw (SPST) variety. Ideally, I could find a push-on, push-off
switch which - I believe - is written on-off in the switch
function terminology but I have yet to find a source in my
Google searching that would confirm this. </div>
<div><br>
</div>
<div>I found <a moz-do-not-send="true"
href="http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=157282720&uq=635463031929636734">this
switch</a> after a long search but I am still not sure it is
the one I need as it only says it is on-off (and not the more
descriptive push-on, push-off) anywhere on the documentation or
website. Also, I am not sure if there is something else I am
missing after Paul’s presentation where the switch had
significant noise. This should not be a big deal for a power
switch as I have a couple capacitors on both sides of the power
regulator - correct?</div>
<div><br>
</div>
<div>I am sweating these decisions because I need to make a number
of these boards for a project with the City of Raleigh and I
don’t want to screw it up. If you have other suggestions within
my component budget of $1.50 a piece, please let me know. </div>
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>Chip</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
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