Telephone line tester How many times the line of the modem falls because someone lifts the proper telephone when we have connected on Internet. Besides the two Leds produce a curious effects while the telephone is ringing.If you hoop a bright device already climbed on and tested, or you look for it with different characteristics, even that it flashes to the rhythm of the telephone ring, then you would have to specify it in the feedback form and to describe your own preferences. Component's list: R1=3.3K; R2=33K; R3=56K; R4=22K; R5=4,7K; Q1,Q2=BC547 NPN; BR1=Bridge 1 A 250 V; Led1=Red; Led2=Green. | |
Telephone technology Express Electronic Lab expresslab@hotmail.com |