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2017-08-15 16:38  
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This simple core automotive voltage regulator 555 is a monolithic type  timer . If the timer is off, then its output pin 3 is low, the power Darlington transistors will be off. When the battery voltage becomes too low this case, such as less than 14.4 volts, the timer on Darlington. On Timer can be any general purpose silicon diode or 1 N4157 device.


Can be any general purpose Silicon transistor.


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