This is an Simple blown fuse alarm circuit for AC line, cause we know immediately when broken fuse circuit and it has a few components so easy to build and very cheap.
Fuse Electronic devices that are important to prevent damage to the circuit. When a short circuit occurs, but sometimes we have to fret because the fuse blown.But we do not know makes waste time and thought the machine was broken. But truly broken a fuse. We can fix this easily with a fuse circuit in Figure 1.
Suppose firstly our fuse blown, an AC220 volts so flow through way R1, D1. A capacitor-C1 thus charged until voltage up to 80 volts. C1 will discharged out of D2 and R4. When is this the neon lamps so has dropped across glow. But its brightness will has specific period of time, when C1 discharged completely it will not bright because not has voltage to it. But it will work just like the first, doubling again, Thus see as the neon lamps flashing for fuse blow alerts.
Figure 1 Easy blown fuse indicator light flashing circuit
The flashing of neon lamp we can control with C1 and R1 as we need to fast flash so reduce value of R1 and C1, but you want slow flash then increase R1 and C1 only. For R4 will acts limit current to flow through the neon lamp not too much.
Around this time the Fuse not blown, then AC 220 volts will flow to R2 instead of R1. Because R1, the resistance is much higher.This is why it makes the neon lamp glow instantly. And because it has a continuous power on all the time. C1 in this time will not be able to charge it. Was excluded because of D2 and R3 only.
How to build this projects
This project is not used many components so can soldered directly connected. No need to use PCB as Figure 2. But must to check all parts correctly capacitors and Diodes and lamp.
Figure 2 the components layout of this projects
The components List
Resistors size ½W +5%
C1______________0.22uF (224) 400V
D1, D2, D3_______1N4007___1000V 1A Diode
AC wire, Neon lamp, Fuse in used,
Note: Below is other circuit that same this circuit above.
In sometimes electronics our circuit Fuse torn already. Must change suddenly with the cause time Fuse we must know immediately. Then have Light Flasher when Fuse Lose circuit help warn you. The Neon lamp will about the light all the time. If Fuse good usual. But when Fuse torn or be damaged it will Flasher immediately by winking rate from note by R1 and C1 be valuable about 10 time per second. Hope that this circuit will advantage with friends ,
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