At 16.39 13/02/99 +0100, you wrote:
>Help needed!
>
>I need to identify an unknown chip!
>
>A customer of mine sold until now a lot of electronic units from a
>company in the USA which disappeared from the market totally some
>months ago. These units fail often after some days of operation
>(about 50%) and my customer has to fulfil the warranty.
>
>To fulfil this warranty, he asked me for reverse-engineering this
>unit. Then we would be able to build replacement boards and perhaps
>to figure out why about the half of the original units fails after
>some days of operation.
>
>The problem is, the whole units were filled with (I assume
>Polyurethane) coating and after dissolving it, we found some analog
>circuitry and a 16 pin IC with removed labels. Because there exist no
>schematics or other documentation, I try to figure out which IC it
>might be.  We opened the IC and took some photographs from the chip.
>The first idea (according to the citcuitry around) was XR2206 from
>EXAR, but EXAR said no. On the chip you can find to numeric
>signs, "8025" and "L7501".
>
>Does anybody know of a company or other institution which collects
>chip codes and which could help me to identify the chip?
>Any other ideas?
>
>You can find the pictures on my website
>http://www.mansfeld-elektronik.de/unknown.htm.
>Please be aware there are 5 jpg files with together about 1MB size...
>
>Many many thanks in advance
>Regards
>Matthias Mansfeld
>-----------------------------------------------
>Matthias Mansfeld Elektronik
>* Leiterplattenlayout, Bestueckung
>Am Langhoelzl 11, 85540 Haar; Tel.: 089/4620 093-7, Fax: -8
>Internet: http://www.mansfeld-elektronik.de
>
>################################################################
>DesignerCouncil E-Mail Forum provided as a free service by IPC using
LISTSERV 1.8c
>################################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in the body:
>To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
>To unsubscribe:   SIGNOFF DesignerCouncil
>################################################################
>Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
section for additional information.
>For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
>################################################################
>
>
Exar 2206 are a wave generator (sine triangle an square)
I remenber this old chip because used in music instruments.

Bye
+--------------------------+
| PcbAG                    |
| Pcb Design Service       |
| Gianfranco Angiolini     |
| Via Sofia 3              |
| 47831 Miramare di Rimini |
| Italy                    |
| Tel & Fax +39 541 371440 |
| Email [log in to unmask]  |
+--------------------------+

################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe:   SIGNOFF DesignerCouncil 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################