5 DC/AC Blown Fuse indicator circuit with LED Display

This is a Blown Fuse indicator circuit by LED Display. A Fuse be the equipment protects that use often most. Because of cheapness can use protect electronics expensive circuit. Generally when fuse torn us can know immediately. but in sometimes Fuse is torn already we don’t know. such as in electricity automobile system brake system , the system delays the electric current very much, etc. Fuse torn get into trouble at we must know for immediately the safety.

Simple Blown Fuse indicator LED Display circuit

Blown Fuse indicator circuit with LED Display

Figure 1 The Blown Fuse indicator LED Display circuit.

So I would suggest this circuit is simple. It can show with LED that immediately when Fuse blown. See the illustration as Figure 1
In normally or Fuse is good, Current flow through it to D1-diode 1N4148 as forward bias, so cause Q1-PNP transistor do not conduct current, It not work so LED go out.

But Fuse blown or Damaged by high currents from overload, cause open circuit. So there the base current to Q1 it so bias or has higher current flow through R1-resistors, collector, emitter of Q1 and LED1 glow immediately.

by equipment value that show that note for Voltage Source 12V , but if friends want to apply to the level Volt the other.

As a result change value R1 and R2 get by can calculate from R1 = (Vin – 2) x 50 and R2 = (Vin – 2) x 10000/2. Think the work of the circuit has a little, It may help to give friends comfortably up.

How to build

This project is not used many components so can assemble on the universal PCB board.as Figure 2 and Figure 3 The wiring and placing components must be carefully for is the polarity of Diodes, LED , transistor BC558 correctly.

blown-fuse-indictor-led-display-pcb
Figure 2 Prototype Blown Fuse indicator LED Display.

blown-fuse-indictor-led-display-pcb-layout
Figure 3 Copper of the PCB of Blown Fuse indicator LED Display.

And see below…

I check Fuse OK, then put it in circuit next power supply to circuit, and lastly Short circuit! Ohh LED display immediately. This circuit works!

Fuse status indicators for 12 volts power supply

This circuit is a Fuse status indicators for power supply 12V. If a fuse is normally, the LED is going to lights all the time. But when it lacks, the LED will be blinking. The value of this equipment in the circuit is suitable for a 12 volt power supply.

However able to change the power supply 6 volt or 24 volt, By reducing the value of the resistor to half or increasing.

The display section consists of a stable multivibrators (Q1-BC547, Q2-BC547). And the driver LED section (Q3), All circuits except for the R5 connect before the fuse.

Fuse status indicators for 12 volts power supply

The output of the multivibrators is going to work all times there are power supply, by passed through the diode D2 to the input of the driver LED section (Q3‘s PinB) If the fuse is intact , the base current of Q3 has still always, by passed through R5 and D1,the color LED shown constantly. But when fuse in blown condition,the driver current Q3 is going to get from only multivibrators, so the led is flashing.
The current rate of Power consumption about 30 mA, by almost all were used by the LED. If you are used this circuit with some circuit that uses a high quality LED and changed R6 values to suitably with the lower current of the LED.

LED Blown AC Fuse Indicator Circuit Diagram

The Fuse failure alarm with 2 led light that LED display when the load is low resistance or short circuit, fuse blow once. LED1, LED2 show fuse state. In circuit use a few parts.

How it works

This circuit will show the performance of the equipment,or Check the fuse in the circuit.The circuit is small and the power supply voltage of all kinds.

It display with LED, 2-color in one. Which is cathode common kind,the anode has two separate terminals.

If the circuit is functioning properly LED, it shown in green colour.

The display is red when the fuse in the circuit is damaged.The resistor R1 limits the current to flow through the LED is about 2 mA.

This is enough to make the LED light. If it lowers the R1 down, the LED lights up.

Fuse failure alarm with 2 LED light

In the normal operation of the circuit and The fuse is not damaged. The zener diode to prevent the green and red LED lights up simultaneously.

Zener diode prevents the LED is green and red lights simultaneously.

The high efficiency LED when connected in parallel. The red LED uses high-voltage so that only green LED lights up only.

Diodes D3 and D4 will prevent dangerous for the LED. While the half cycle negative voltage of the alternating current voltage.

However, if the DC supply voltage. I do not have to use diode protection.

How to build this project
This project uses a few components so can assemble the circuits into the universal PCB board.

AC line has blown fuse alarm circuit

This is a Simple blown fuse alarm circuit for the AC line. It causes 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 is blown.

 

First: Blown AC fuse indicator with neon light

But we do not know what 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 is blown, AC220 volts so flow through way R1, D1. A capacitor-C1 thus charged until voltage up to 80 volts. C1 will be discharged out of D2 and R4. When is this the neon lamps so has dropped across the glow.

But its brightness will have a 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.

blown fuse indicator light flashing
Figure 1 Easy blown fuse indicator light flashing circuit

The flashing of the neon lamp we can control with C1 and R1 as we need to fast flash so reduce the value of R1 and C1. But you want slow flash then increase R1 and C1 only. R4 will act 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 project

This project is not used many components so can solder directly connected. No need to use PCB as Figure 2. But must check all parts correctly capacitors and Diodes and lamp.
components-layout-of-this-projects
Figure 2 the components layout of this projects

The components List
Resistors size ½W +5%
R1: 4.7K
R2: 470K
R3: 1M
R4: 1K
Capacitors
C1: 0.22uF (224) 400V
Semiconductor
D1, D2, D3: 1N4007___1000V 1A Diode
Other components
AC wire, Neon lamp, Fuse in used,

Note: Below is another circuit that same this circuit above.

Another AC fuse alert circuit

In sometimes electronics, our circuit Fuse is 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 is torn or be damaged it will Flasher immediately by winking rate from a note by R1 and C1 be valuable about 10 times per second. Hope that this circuit will advantageous with friends.

Second: AC Fuse indicator using 2 LED

The Fuse failure alarm with 2 led light that LED display when the load is low resistance or short circuit, fuse blow once. LED1, LED2 show fuse state. In-circuit use a few parts.

How it works

This circuit will show the performance of the equipment,or Check the fuse in the circuit. The circuit is small and the power supply voltage of all kinds.

It displays with LED, 2-color in one. Which is cathode common kind, the anode has two separate terminals.

If the circuit is functioning properly LED, it is shown in green color.

The display is red when the fuse in the circuit is damaged. The resistor R1 limits the current to flow through the LED is about 2 mA.

This is enough to make the LED light. If it lowers the R1 down, the LED lights up.

Fuse failure alarm with 2 LED light

In the normal operation of the circuit and The fuse is not damaged. The Zener diode to prevent the green and red LED lights up simultaneously.

Zener diode prevents the LED is green and red lights simultaneously.

The high efficiency LED when connected in parallel. The red LED uses high-voltage so that only green LED lights up only.

Diodes D3 and D4 will prevent dangerous for the LED. While the half-cycle negative voltage of the alternating current voltage.

However, if the DC supply voltage. I do not have to use diode protection.

How to build this project
This project uses a few components so can assemble the circuits into the universal PCB board.

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This Post Has 5 Comments

  1. i wont to know the means of operation of Blown Fuse indicator LED Display

  2. Dear can we use this circuit for AC indicator…

  3. Dear sanjeev It can be done but it is more complex and dangerous since you are dealing with 120 or 220 VAC!!!

  4. Once Again A Fun Easy To Build Circuit…THANKS GUYS!!!!!

  5. When the fuse is good There is +11.3 volts on the Base of the Transistor(PNP) So The Transistor Is Cutoff, When The Fuse Blows The Voltage is 0 Volts or More Negative than 11.3 volts, and Now The Transistor is switched ON , Hence The LED now Lights Up…Simple But cute Little circuit!!!!

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