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Telephone and facsimile apparatus protection circuit

2016-09-10 12:35  
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Telephone and facsimile apparatus protection circuit
Telephone and facsimile apparatus protection circuit is shown as above,due to the exterior line often appears instantaneous high voltage to result in the damage of the telephone,the facsimile apparatus and so on.In view of this situation,this protection circuit can effectively prevent the damage of the telephone and the facsimile apparatus because of lightning stroke and line's accidental over-voltage.The circuit has no affect on telephone and facsimile apparatus completely. The transistor VD is 9013 and β = 65-115;Directional triode thyristor VS is SAC616;Resistor is the RJ type,nominal power is 0.25 ~ 0.5W on average.