Blinks a LED when there is an incoming call on a phone line. schematic.png

A device that blinks a LED when there is an incoming call on a landline. If someone gets a lot of calls, it might get annoying hearing the phone ring constantly. This device provides a silent method of knowing when there is an incoming call. It is also compatible with teletypes. It is far less expensive than the products currently on the market that accomplish the same task. It can be used in conjunction with Microphone.

schematic.png 22kr 22K Resistor Prevents optocoupler LED from burning out. Salvaged from PCB 47kr 4.7K Resistor Keeps LED from buring out. Salvaged from PCB 1uf 1uF 250V Capacitor Blocks DC while letting ring AC through. X10 controller d Diode Single diode rectifier. ATX Power Supply pc817 PC817 Optocoupler Isolates LED from telephone line. ATX Power Supply /datasheet/pc817.pdf redled Red LED Ring Indicator Amazon Front Back Final Schematic Final Schematic (Annotated) ringdetect.sch ringdetect.sch docs 2.9 KB 1.0 Schematic (KiCad) ringdetect.pdf ringdetect.pdf docs 17.9 KB 1.0 Schematic (PDF) Project Build Project Page Finished