Please do share it for people who might not be able to find the "classic" one.The tweety bird circuit that most people used back in the 80s was a copy of the "WARBLE ALARM CIRCUIT" that was in the Semiconductor replacement guides sold by Radio Shack from 1977 thru ??? Look at the 555 timer page. the circuit is shown there. uses two 555s or one 556. It is basically an astable oscillator driving a vco, Pretty simple to construct... sounds great on-the-air.
if you want, I can post a copy of the circuit here.
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This was at the top of the search results for warble alarm clock, although i dont see any RCA CA 3045 timer.
http://www.sentex.ca/~mec1995/circ/Warble.html
http://www.ebay.com/itm/like/252171055652?lpid=82&chn=ps&ul_noapp=trueDon't mind at all, sorry didn't see your question sooner. As with everything....just google it. "CA 3045 buy"
Last time I did that there were some on Amazon.com of all places for a whopping $2.15
I got mine from some other electronics parts house that google brought up but that has been several months ago and I don't remember the place. It was like American Semiconductor or something like that. Their price was also $2.15
good luck
this RCA Chip?