Pls, I have got an intercom circuit from a site that uses MC145436 DTMF decoder but the IC is obsolete, how do I get the equivalent becos I've searched to no avail.
Also, I need a 1k/8R centre-tapped at 1K winding audio xformer for the ringer cct of d same project, I read that using a mains xfomer (for 12V operation, 60v centre-tapped secondary and 230v prmary), one could achieve the same, Is it possible/true?
Which scrap can I easily get audio transformer for me to use?
Pls, my project is being delayed due to these two problems.
Lanre
Nigeria
Also, I need a 1k/8R centre-tapped at 1K winding audio xformer for the ringer cct of d same project, I read that using a mains xfomer (for 12V operation, 60v centre-tapped secondary and 230v prmary), one could achieve the same, Is it possible/true?
Which scrap can I easily get audio transformer for me to use?
Pls, my project is being delayed due to these two problems.
Lanre
Nigeria