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DTMF Information from RCS Radio
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12106911 DTMF printed circuit board as presented 
in the magazine SILICON CHIP, 1991 May, by a techo. with 
very extensive telephonic networks Greig Sheriden

6.8" x 5.5" (170mm x 140mm) x 599 holes single sided from RCS Radio

I.C's used are 555, MC145436, 4011, 4514, 4043 (x3), 4013 (x2) 
misc other items, xtal 3.579mhz, relay, electret mic, (for testing)
npn & pnp general purpose transistors, LED's, 600:600 transformer

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to get a current price on this pcb goto...

http://www.rcsradio.com.au
click onto EAETISC Magazine project circuit boards page
then click onto the 'OLDtoNOW' txt file

use your web 'find' command, type in  12106911 [ENTER]

A full photo-copy (instructions) of this project can be purchased 
only at the time of pcb purchase, to comply with copyright regs.

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sales@rcsradio.com.au