Review on 8CH DTMF Relay Phone Voice Signal Decoder Module, AD22A08 DC 12V Remote Controller Switch by Butros Allen
Good quality DTMF converter.
I bought a couple of these boards to add Touch-Tone capability to a 1978 OKI Electric AC125A Crossbar PBX. They work great. Documentation can be found online with a little searching.
Pros
- DTMF from phone or hand held radio work very good
Cons
- The 8CH DTMF Relay Phone Voice Signal Decoder Module comes with a complex wiring system that may seem daunting for inexperienced professionals
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