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Reed Switch as a Current Monitor

2015-03-02 19:59  
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Reed Switch as a Current Monitor
Reed Switch as a Current Monitor
Reed Switch as a Current Monitor
In this current monitoring circuit we use a Reed switch with a LED and a resistor to indicate if is current through a circuit. A Reed switch usually requires between 10 and 100 AT (Ampere-turns = corresponding to the current in a coil multiplied by the number of turns). The lower the AT, the more sensitive the reed switch. For example a car headlight (both light bulbs) has a current consumption of 7 A or 8 A at 12V so a 50 AT Reed switch requires 7 or 8 turns in order to monitor the current.As soon as one bulb is malfunctioning the current is dropping below half and the switch opens its contact.