IC identification help

[Buck Buchanan]

At 12:28 PM 10/5/98 EDT, Hcabnivek at aol.com wrote:
>I'm having trouble identifing two chips, and was hoping someone might
>recognize them with out going through too much trouble.  They are ULN2212
>(DIP16) and ULN2209 (DIP8).  Anyone have an idea what theese are?  Web search

Hello,  Try a search for an Exar 2209 or more commonly XR2209.  Assuming
the ULN2209 to be the same thing, it's a "precision oscillator" though I
seem to remember it's not terribly well suited to synthesizer stuff (small
linear CV sweep I believe).  It wouldn't surprise me if the 2212 is a
related device.  The 2209 is related to the popular XR2206 fucntion
generator (tho not popular for synthesizers).

> Also, does anyone have data for the LM558 quad timer? I have at least 50 of

I can snail mail you both these sheets as I have no way to put things up on
the net... yet.  Send me that address!

>these, but apparently they are obsolete, as no data sheets are available.

I can't confirm that they're obsolete but ask anyone with a box (synth)
full of 3340s - designing around obsolete parts can bite you in the booty
later on....

Take it easy,

Buck