EXPRESS ELECTRONIC LAB

 Express Electronic Lab

 


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TELEPHONE: SCHEMES & FITTINGS

Bright Telephone call-boy  Telephone line tester  Simple Phone Tap  Telephone Recording Switch  Revealing of cut line  Function Hold  RFI: Filters and Technical Solutions  Fixing Radio Interference on Phones  Technical Bulletins  Fixing Loop Current  FM Telephone Bug  Cordless Telephone  RFI Eliminators

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.

Phone Busy Tester

NEW !!! Telephone technology

Express Electronic Lab

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