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TonyDuell · 7th Oct 2017, 12:56 pm

The TEA1061 is the speech circuit (the replacement for the induction coil), the comment about the 'dialer interface' means you can link a dialer chip to it (it has a pin to inject the DTMF signal). The MC34017 is a ringer. So that means that (as in the Tribune I was working on) the MEDL IC is the dialer.

Is there a discrete transistor circuit acting as a line switch hung off the dialer chip? If the telephone supports pulse dialing then that is likely. If that's failed the telephone won't loop the line.

7th Oct 2017, 12:56 pm	#15
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: "Genie" telephone The TEA1061 is the speech circuit (the replacement for the induction coil), the comment about the 'dialer interface' means you can link a dialer chip to it (it has a pin to inject the DTMF signal). The MC34017 is a ringer. So that means that (as in the Tribune I was working on) the MEDL IC is the dialer. Is there a discrete transistor circuit acting as a line switch hung off the dialer chip? If the telephone supports pulse dialing then that is likely. If that's failed the telephone won't loop the line.