Thanks for the valuable files and pictures Walt. I guess this mic is not going
to be as portable as I had hoped. With your info at least I'll have a starting
point.
J
Walter Knapp wrote:
> jyoung1113 wrote:
> > Greetings all,
> > I just took delivery of a Sennheiser MKH 110 and need a bit of
> > guidance.
> > The mic came with the plug that plugs into and screws on the end.
> > The problem I have is wiring. I don't know what the order is for the
> > 3 pin (XLR?) female plug. I am using a production made XLR cable and
> > cut off the end nearest the mic.
> > The paperwork that came with the mic says that the wiring is a "B".
>
> It's special to that mic, it's unbalanced, and non-standard. I have a
> scan of the powering circuit diagram that Sennheiser gave me linked off
> my SASS/MKH-110 page, so you can make your own interpretation:
> http://frogrecordist.home.mindspring.com/docs/sass_mkh110.html
> Note the B up in the corner of the scan...
>
> It takes 8 volt power, spec is plus/minus 1 volt, do not connect the
> cable shield to the connector if you intend to use the mics in pairs. It
> does ok to do that in singles, though it's not what Sennheiser is
> showing, (we think). It's a positive ground sort of setup. It draws 8 ma.
>
> In my power setup I used a 10k trimpot to drop voltage off a 9 volt
> battery. The filter cap I used is 470 mfd. I use 1 battery, but the rest
> is split for the two mics. I run both plus and minus of the signal
> through 4.7 mfd mylar caps. The plus of the signal at the mic (pin 1) is
> carrying about 5-6 volts DC compared to the minus (pin 2) so you must
> block that DC off. They show a 2nd 5 volt battery, I did not do any of
> that part, it's some sort of optional way.
>
> In any case you will have to work out powering, it's not phantom or T
> power. I know the mics are happy with voltages ranging from 6-9 volts,
> though I've not done critical tests at all voltages. My system starts
> the mics off at full charge at 8.8 volts and drops with the battery voltage.
>
> As far as connecting all that into the XLR cable, only pins 1 & 2
> connect, and that through the caps. Pin 3 at the mic is 8 volts plus and
> does not connect to the XLR. The negative of the 8 volts is connected to
> pin 2 of the mic. Run the shield no farther than the cable going to the
> mic, but not the mic connector (you can shield the cable). I keep the
> shield isolated from signal minus. I shrink wrapped my cable's shield so
> it would not accidentally contact the connector. I've not had a problem
> having the mic housings floating so far.
>
> Anyway, my SASS/MKH-110 is running fine finally going that way.
>
> Walt
>
>
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