<div dir="ltr">Is it possible just to use digital mic?</div><div class="gmail_extra"><br><br><div class="gmail_quote">On 19 November 2012 01:32, jm <span dir="ltr"><<a href="mailto:joem@martindale-electric.co.uk" target="_blank">joem@martindale-electric.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Sat, 2012-11-10 at 13:04 +0000, luke.leighton wrote:<br>
> <a href="http://rhombus-tech.net/community_ideas/kde_tablet/news/" target="_blank">http://rhombus-tech.net/community_ideas/kde_tablet/news/</a><br>
><br>
> hi joe, ok does this look any good? i re-did the LM17000, and laid<br>
> things out a bit more obviously (i hope!) how would i connect the mic<br>
> up - is MICM going to need capacitors/resistors? and what about the<br>
> headphones?<br>
><br>
> i vaguely know what to do i.e. it will make sense when i see it :)<br>
><br>
> l.<br>
<br>
</div>Luke,<br>
<br>
I am looking at<br>
<a href="http://hands.com/~lkcl/eoma/kde_tablet/TABLET162_20121110.pdf" target="_blank">http://hands.com/~lkcl/eoma/kde_tablet/TABLET162_20121110.pdf</a><br>
<br>
C184 has size 0603 and a dubious value of 1uF which is stretching<br>
what is possible - probably an error.<br>
<br>
C135 can go, R169 is 100K, R42 can go, C184 can go, R168 is 100k, q14<br>
is 2N7002<br>
<br>
C186 can go, R99 is 100k, R104 can go<br>
<br>
R23 looks dubious. It may need to go and the xtal chosen so as not<br>
to require R23 to be present.<br>
<br>
For the LM3700, you will need to do a separate equivalent circuit<br>
diagram with all the opamps and passive components in play shown.<br>
That is for communication purposes - its hard to analyze what is what<br>
when all the components are distributed.<br>
<br>
The H-bridge area also needs a separate equivalent circuit<br>
showing the mosfets and related components in play so that it can<br>
be more readily analyzed. Search google images for typical h-bridge<br>
diagrams and make it look reasonably like a standard h-bridge<br>
configuration.<br>
<br>
The other substitutions for transistors with 2N7002 FET seem all fine.<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
<br>
<br>
<br>
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</div></div></blockquote></div><br></div>