Well I will keep you posted on how I make out with information from the company.
This is such a promising piece of equipment, I'd hate to have to give up on it.
But I'd
also hate to damage it too. My electrical background is that of a tinker,
perhaps not
strong enough for this project. Thank goodness I only have one of these things
to worry
about, stereo would really do me in. There is a blessing to being deaf in one
ear, mono
is as complicated as I need.
Thanks Walt.
J
Walter Knapp wrote:
> J. Young wrote:
> > I'm trying to get Sennheiser to look around for any info that they may find
> > for the
> > MKH 110. Too bad their web site is only good for their latest products and
> > really
> > not much info on them either.
> > I'd like to find more info on that mkh 104 power supply, etc. that you
> > mentioned.
> > That may give me an idea about how to proceed. I'd really hate to put a
> > soldering
> > iron any where around this mic without a good plan.
>
> Note that you would have to adapt the MZA-6 power supply. The MKH-104
> uses 8 volts, but reverse polarity to the MKH-110, it's not the same.
> The circuit for the MZA-6 shows pin 1 & 2 passing straight through, with
> the battery stack connected between 2 & 3 with the pin 2 side positive.
> They also show the shield tied together all the way from amp to mic. But
> when you reverse the 8 volts for the MKH-110, the shield needs to be
> broken, at least if doing a pair into the same pre. Otherwise the shield
> becomes the feedback pathway for a nasty oscillation between the two.
>
> Assuming your pre used a cap in it's input to cut off the DC, all you
> would have to do with the MZA-6 is reverse the batteries. The original
> used 6 RM-625 mercury batteries. The MKH-104 has lower current draw, and
> from their specs they got 50 - 60 hours on a set of batteries. That
> would work out to about 30 - 35 hours for a MKH-110. Which is why I
> noted it would be expensive to keep fed batteries.
>
> Note that the MZA-6 diagram shows a mic pre front end that's isolated
> with a cap internally. If your mic input cannot handle 5-6 volts DC on
> the signal line itself, you would need to build a cap into the MZA-6.
>
> Their MZN 4/1 power supply (for AC) feeds a zenar regulated 12 volts
> into a 800 ohm resistor to drop voltage. Then the usual filter cap. Do
> note the resistor size is dependent on current as well as voltage. Mine
> works out somewhere around 190 ohms to drop off 10 volts, the current is
> higher.
>
> I have Sennheiser's pamphlet of the period. It does not cover the
> MKH-110, but covers the others, including circuit diagrams for the
> various power supplies. And photos of most of them. Too bad they did not
> detail the MKH-110 in there. I could scan things out of there, but it's
> really not going to help.
>
> When I had Sennheiser look around, all I got was the circuit diagram
> that I scanned and a table of the basic specs. It will be interesting to
> see if you can get anything different. I had another source claim to
> have info, and when that arrived it was the same diagram. I did not try
> the parent company in Germany, only the US part.
>
> Note the inside of the MKH-110 is stuffed from end to end with circuit,
> it would be very tricky to design in some circuit to work off phantom
> power. The housing is also part of that circuit, so it would be also a
> challenge to machine a larger housing. I'd expect the RF circuit might
> have to be retuned if you did that. And I've not the least bit of info
> on that.
>
> Walt
>
>
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