[Arm-netbook] headphone / mic

[jm]

On Sat, 2012-11-10 at 13:04 +0000, luke.leighton wrote:
> http://rhombus-tech.net/community_ideas/kde_tablet/news/
> 
> hi joe, ok does this look any good?  i re-did the LM17000, and laid
> things out a bit more obviously (i hope!) how would i connect the mic
> up - is MICM going to need capacitors/resistors?  and what about the
> headphones?
> 
> i vaguely know what to do i.e. it will make sense when i see it :)
> 
> l.

Luke,

I am looking at
http://hands.com/~lkcl/eoma/kde_tablet/TABLET162_20121110.pdf

C184 has size 0603 and a dubious value of 1uF which is stretching
what is possible - probably an error.

C135 can go, R169 is 100K, R42 can go,  C184 can go, R168 is 100k, q14
is 2N7002

C186 can go, R99 is 100k, R104 can go

R23 looks dubious. It may need to go and the xtal chosen so as not
to require R23 to be present.

For the LM3700, you will need to do a separate equivalent circuit
diagram with all the opamps and passive components in play shown.
That is for communication purposes - its hard to analyze what is what
when all the components are distributed.

The H-bridge area also needs a separate equivalent circuit
showing the mosfets and related components in play so that it can
be more readily analyzed. Search google images for typical h-bridge
diagrams and make it look reasonably like a standard h-bridge
configuration.

The other substitutions for transistors with 2N7002 FET seem all fine.