Monday, January 30, 2012

Telephone Ring Indicator and Line

Telephone Line Ring and Indicator
It is a relatively simple circuit, which can have visual and audible indication when we telephone gradients on the phone line. Calls to the line, converted into pulses of frequency 400 Hz from the IC2, the output 3. Then through IC4, as reinforced by two times, can lead to an input amplifier and a speaker to hear the slope, at which level we want. The desired sound level is adjusted by the trimmer TR1 that if we can be replaced with a potentiometers. With the passage Led LD1 have visual indication of the slopes. Simultaneously through the IC3 may be driving an external circuit, adapted to the needs of each user.
Part List
R1-3-13=4.7Kohm C1-7 =100nF 630V Q1-2 = BC550C
R2-11-12 =1Mohm C2=4.7nF 63V MKT IC1-3 =4N35 - CNX38
R4 =1Kohm C3 =220uF 25V IC2=LM555
R5 = 2.2Kohm C4 =33nF 63V MKT IC4 =TL071
R6 = 33Kohm C5 =220nF 63V MKT LD1 =LED 3-5 mm
R7 =390Kohm C6 =10uF 25V TR1=10Kohm Trimmer or Pont.
R8 =820ohm C8 =47nF 63V MKT CON1 =4 pin connector
R9 =22Kohm C9 =100uF 25V CON2 =4 pin connector
R10 =1.8Kohm D1-2 =20V 1,3W Zener
R14 =10Kohm D3 =1N4002



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