National LM703N

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From: chuck adams (adams@chuck.dallas.sgi.com)
Date: Thu Nov 02 1995 - 12:39:09 EST


Gang,

I am looking for the above chip, a National LM703N.

Usual noise bridges as found in the ARRL Handbooks for
years have been using a Zener with 555 chip to generate
noise. Well, this years new ARRL Handbook for 1996 has
a new circuit that has reduced the parts count significantly.

This is good news. Bad news is that I can't find anyone that
has the chip.

So with all the experimenters in this group, surely someone
knows about this critter. Did they make it up? I don't
think so and hopefully it is not an obsolete part.

Any help greatly appreciated.

BTW: This new bridge, if you throw out the variable and do
it just for 50ohms reduces to the following parts:

1 - Zener
3 - Resistors
3 - Capacitors
+1 more resistor that I missed in my drawing
1 - Toroid
1 - Chip.

FYI

dit dit

--
Chuck Adams (K5FO CP-60)  adams@sgi.com
Box 181150, Dallas, TX  75218-8150


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