RS used to sell such an item...plugs in and strobes when the line rings...
use them a lot in broadcast use.....

Chris
WB5ITT
at arrl.net

Keith wrote:

Does anyone have a schematic for once of those strobe circuits that will
flash when the phone rings. I want to make one for my workshop where it's
very noisy at times and I don't hear the phone.

Thanks

Keith