====================================================================== DTMF Project pcb information from RCS Radio ====================================================================== 4870s information This pcb has been designed to 'piggy back' onto the 4871s in case you need an automatic telephone connection. It uses the following components... 3.8" x 2.6" ( 96mm x 66mm) x 84 holes, single sided from RCS Radio Integrated Circuits it uses a 555, plus a 600:600 transformer, relay, and other small misc items. ---------------------------------------------------------------------- 4871s information This is the main DTMF Logic pcb with DTMF in and 10 logic level outputs being available at a simple DIL 13 pin (26) header. It uses the following components... 5.2" x 3.8" (132mm x 96mm) x 288 holes, single sided from RCS Radio Integrated Circuits it uses are MC145436, 4011, 4514, 4043 (x3), 4013 (x2) misc other items, xtal 3.579mhz, electret mic, (for testing) ---------------------------------------------------------------------- 4872s information This is the DTMF very simple relay decoder unit to provide perfect isolation for the logic level outputs, so you can action any item connected with no unusual voltage problems. It uses the following components... 5.2" x 3.8" (132mm x 96mm) x 230 holes, single sided from RCS Radio components it uses are 10 mini-relays, 10 transistors plus other misc items like diodes, resistors and indicator LED's ====================================================================== to get a current price on these pcb's goto goto our web site, http://www.rcsradio.com.au then goto EAETISC Project circuit boards then click onto the 'OLDtoNOW' old listing use your web 'find' command, type in 4870s and 4871s and 4872s [ENTER] A full photo-copy (instructions) of this project can be purchased at any time of pcb purchase ======================================================================