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Yamaha DMP11 Obsolete IC

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3/2/1999 8:06 PM

Yamaha DMP11 Obsolete IC

A colleague of mine is searching for an IC as described below. Here's the relevant info as excerpted from an email he sent to me and some other folks:

We currently have a Yamaha DMP11
digital mixer in for service that has a couple of bad active audio filter
ICs. Tapping on them causes pops and clicks in the audio and sometimes they
will start oscillating all by themselves. The Yamaha part # is XE275A00 and
is now obsolete. The generic # as best as I can tell is an NEC LP20D9B6.
The IC is a hybrid epoxy style part in a SIP package. It functions as the
LPF in the front end stage of the mixer and is a +/-15V bi-polar unit. The
research I've done thus far in finding a suitable sub has yielded mostly
uni-polar +5V designs necessitating the need for additional circuit changes
to implement the substitution. Any help with obtaining the original part
and/or a more suitable sub would be greatly appreciated.

If any of you can offer assistance, please post a reply here or contact me and I'll pass the info on to my colleague. Thank you.

3/3/1999 5:34 AM
Paul Perry	It is VERY long odds against TWO audio filter IC's going bad. Are you sure it isn't a decoupling capacitor right next to the chip that has gone bad, or the soldering to it?

3/8/1999 8:38 PM

Dave, Yamaha in Australia advise the IC in question , Yamaha part number XE275A00 is now superceded to a new part number which is functionally identical, but later production .
There is one only of the old part number available here at my account cost of A$16.50 plus local freight and more of the new part number available at my account cost of A$37.07 plus local freight ! New production = price rise . Hope this helps .

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