UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Homemade LD-DTMF Converter.

ThePillenwerfer · 13th Apr 2017, 5:42 pm

I came across details of this device which uses an ATTiny85 micro-controller some months ago but it was skimpily documented, and what there was was American, and gave no details of how to get the code onto a micro-controller.

I've finally managed it and it works very well. It does have limitations though.

Firstly it needs fitting inside the telephone, which involves some (reversible) mutilation and secondly the PCB is rather large. What it does have going for it is being dirty cheap.

I've only used it on my ATA as I'm far too upright a citizen to connect it to a PSTN line.

Details are here: http://joefreeman.weebly.com/uploads..._convertor.pdf

13th Apr 2017, 5:42 pm	#1
ThePillenwerfer Octode Join Date: Mar 2011 Location: Sheffield, South Yorkshire, UK. Posts: 1,453	Homemade LD-DTMF Converter. I came across details of this device which uses an ATTiny85 micro-controller some months ago but it was skimpily documented, and what there was was American, and gave no details of how to get the code onto a micro-controller. I've finally managed it and it works very well. It does have limitations though. Firstly it needs fitting inside the telephone, which involves some (reversible) mutilation and secondly the PCB is rather large. What it does have going for it is being dirty cheap. I've only used it on my ATA as I'm far too upright a citizen to connect it to a PSTN line. Details are here: http://joefreeman.weebly.com/uploads..._convertor.pdf __________________ "Experts are only good at one thing: explaining why something will not work!"