Wednesday, September 24, 2014
Simple Blown Fuse Indicator Circuit
Base current for O1 is taken from the ‘earthy’ side of FS1. O1 will conduct its collector voltage falling to zero. Q2 base will also be zero, switching LED 1 off.
lf FS1 were to ’blow or cease to exist, depart for its maker, have a rest, go to sleep, peg out, become inoperative, deceased, out of order, or duff, kick the bucket, bite the dust, pass away, self destruct, become no longer intact, or cease to conduct in any way, due to war, flood, corrosion or act of God etc., O1 would switch off, causing its collector to rise to 12 V, switching O2 and LED 1 on. R2 is the current limit resistor for LED 1. SW1 will by-pass FS1 via emergency fuse 1, until FS1 can be replaced.
Simple blown fuse indicator circuit is given below:
lf FS1 were to ’blow or cease to exist, depart for its maker, have a rest, go to sleep, peg out, become inoperative, deceased, out of order, or duff, kick the bucket, bite the dust, pass away, self destruct, become no longer intact, or cease to conduct in any way, due to war, flood, corrosion or act of God etc., O1 would switch off, causing its collector to rise to 12 V, switching O2 and LED 1 on. R2 is the current limit resistor for LED 1. SW1 will by-pass FS1 via emergency fuse 1, until FS1 can be replaced.
Simple blown fuse indicator circuit is given below:
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