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'OT ic help'
1997\10\19@095502 by peter

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sorry its ot but I'm desperate

Anyone have the pinout or data sheet
for Ferranti ZN470 circa 1983 ?
It's still listed in a Plessey 1991 shortform
under telecoms as a (telephone) microphone amp

General Electric(http://www.gpssemi.com) have nothing on
their site, nor does giicm
and searches turn up nothing but misses !
thanks
Peter
--
If God so loved the World (and created it)
then why is it so imperfect ?
It's got more bugs than windoze 95

spam_OUTpeterTakeThisOuTspamcousens.her.forthnet.gr

1997\10\20@041013 by Leon Heller

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In message <.....3448A084.41B4KILLspamspam@spam@cousens.her.forthnet.gr>, Peter Cousens
<peterspamKILLspamCOUSENS.HER.FORTHNET.GR> writes
>sorry its ot but I'm desperate
>
>Anyone have the pinout or data sheet
>for Ferranti ZN470 circa 1983 ?
>It's still listed in a Plessey 1991 shortform
>under telecoms as a (telephone) microphone amp
>
>General Electric(http://www.gpssemi.com) have nothing on
>their site, nor does giicm
>and searches turn up nothing but misses !

It isn't in the 1988 Plessey Linear IC Handbook.

Leon
--
Leon Heller: .....leonKILLspamspam.....lfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

1997\10\20@134156 by Reginald Neale

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>In message <EraseME3448A084.41B4spam_OUTspamTakeThisOuTcousens.her.forthnet.gr>, Peter Cousens
><peterspamspam_OUTCOUSENS.HER.FORTHNET.GR> writes
>>sorry its ot but I'm desperate
>>
>>Anyone have the pinout or data sheet
>>for Ferranti ZN470 circa 1983 ?
>>It's still listed in a Plessey 1991 shortform
>>under telecoms as a (telephone) microphone amp
>>
>>General Electric(http://www.gpssemi.com) have nothing on
>>their site, nor does giicm
>>and searches turn up nothing but misses !
>
>It isn't in the 1988 Plessey Linear IC Handbook.
>
>Leon
>--

From page IC25 of the 1983 Ferranti QUICK REFERENCE GUIDE

Description: "The ZN470AE was developed for use with an electret
transducer, to replace the carbon transmitter in telefony (sic) systems.
The amplifier contains a bridge to allow dual polarity operation. The high
input impedance makes it suitable for use with high or low impedance
microphones, providing the microphone gives a high output voltage."

Powered from telephone lines
4 gain settings by adjustable links provides 25db nominal
other bulleted features I didn't copy

1 = no function shown (maybe common for gain adjustment links?)
2 = GT1
3 = GT2
6 = GT3
7 = one side of LINE
8 = other side of LINE
9 = BIAS (for electret?)
14 = +VE I/P
13 = -VE I/P

Reg Neale

1997\10\20@150645 by peter

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Re. zn470 thanks to all
Plessey(GE) faxed me the data sheet today

A leaky 39pf cap on the opamp +in
(biased vai 6.8Meg)was causing the problem

Peter
--
If God so loved the World (and created it)
then why is it so imperfect
It's got more bugs than windoze 95

@spam@peterKILLspamspamcousens.her.forthnet.gr

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