"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by Telephone_Singer22, December 17, 2016, 03:06:10 PM
QuoteAs for building a pulse-to-tone converter, I don't believe there is a cheap DIY solution, at least for a single unit.
Quote from: unbeldi on April 16, 2017, 09:51:39 AMThe entire difficulty in the pulse-to-tone converters is the power requirements of the converter circuit, the semiconductors involved. For good reason, the idea is usually to not require additional power than what the telephone local loop provides in the 48VDC line level. You don't really want another cord coming out of a telephone for power. Unfortunately, the available power on a pair can vary greatly today, despite the standards that do exist. Line noise, e.g. high-frequency components from electric appliances and other gadgets close by, is another aspect that is impossible to predict, and these little converters don't have much protection against any of that.I have built several converters and dial pulse timers on breadboards with Arduino processor boards, and it was easy to make them work with stable power, from a separate supply. If I were to sell any, I would also design them with a separate power supply, so that they should be installed at the wall jack or network interface.I have to disagree, that a Panasonic is too difficult to install for many people. That would be true only if those people also cannot install an answering machine. I agree, some can't hack that, indeed. Line in, telephone out. It is that simple to install a Panasonic system. Just a little bigger, and more jacks to select from. With today's phone trees to navigate for most service requests almost everywhere, it is hard to conceive that somewhat can't dial 9, or 81, to make an outgoing call.The parts really only cost a few dollars. A complete Arduino processor board can be as cheap as a dollar or two. I think I paid less than $10 for a lot of five some time ago, and these don't get more expensive with time. The cost is in the programming expertise of course. But frankly, counting pulses is easy ! Generating tones can be done with existing libraries, it is rather plug and play. IIRC, there are DIY projects available online.
Quote from: ThePillenwerfer on April 18, 2017, 06:07:37 AMDetails (code, diagrams, links to orginal sources and instructions) are here.