Years back - My mom's friend (half deaf) had trouble hearing her phone ring.
I decided to make a simple flasher to help her "see" the phone ring.
This is a modification of that project - this time using Bright RGB LEDs
with a rating of 15,000 mcd.
I decided this time I wanted a flasher that you would notice in a room even
if it was still daylight.
I found a compromise between being blinded and more than bright enough
at a current of 24ma per Bright (15000 mcd) RGB LED pair.
Above (Image #1) is a photo of the minimal components I used to construct the circuit.
This picture (Image 1) shows the wiring of components and also photos of the
final in-box layout and resulting flash of the bright (15000 mcd) RGB LEDs
when connected to the phone line via the phone cord with RJ45 jack.
Step 1: PHONE-ALERT Construction
Image #2 above shows the Components and Tools needed to construct the PHONE-ALERT.