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28.03.2015
As there is serious discussions going on about our previous Automatic LED Emergency Light Circuit using LM 317, Mr.Seetharaman has come up with a modified version of the same which answers many of the doubts raised in our Comments section. Here follows Seetharaman’s Description about the Modified Automatic LED Emergency Light using LM 317. Since there were lots of doubts from our readers on the LED emergency light, I have written a detailed letter to two of our readers.
The very important information about BD140 is, as you view the pins, metal portion of the transistor facing down left is emitter centre collector and right is base.
The battery requires a full terminal voltage of 6.9V at this point charger should cut off. Of course few modifications are required, which I have indicated on the drawings and on calculations how I arrived at it.  I thought of enclosing it to you so that it can be kept in some library of our site for any ones reference.


The very important information about BD140 is, as you view the pins, metal portion of the transistor facing down left is emitter centre collector and right is base. Seetharaman has further modified this LED Emergency Light with an under voltage cut-off protection to protect battery from deep discharge. Most of the constructors make this mistake, relying on the convention that left base and right emitter. For each circuit we can have a similar detailed theory, may not be with all calculation, just general operation theory of each part of the circuit. Most of the constructors make this mistake, relying on the convention that left base and right emitter.
However, if a starter battery is discharged deeply (more than 20-25% depth of charge), its plates can be permanently damaged and the lifetime of the battery greatly reduced.


Deep cycle batteries have fewer thicker lead plates, and so cannot discharge energy so quickly, but can be cycled deeply and recharged many times without damaging the battery. As a first feed back I am sending this.  I have a feeling that most of the people would have made the mistake in base emitter of BD140, the lead out are against normal convention.



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