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 |
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| R14 =10Kohm | D3 =1N4002 |
Source: http://users.otenet.gr/~athsam%20/telephone_ringer.htm
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