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# Blown Fuse indicator LED Display (BC558)

2014-12-08 07:57
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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 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. I then beg for to advise the circuit is simple. It is can show with , LED that now. Fuse torn already please. See the illustration 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 go up please sir.

## Fuse failure alarm with 2 led light.

This circuit will show the performance of theequipment,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.

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-pressure, 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.

## Fuse status indicators for power supply 12V

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.

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.

## Light Flasher when Fuse Lose

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 , please yes.

## Use SCR help give fuse torn fast

If fuse slow get into trouble not good may make the circuit can is damaged. Normally fuse torn when current change too much. But more will torn must use the period of time which may late go to all right with regard to add SCR go to make fuse torn fast go up by when voltage exceed more at ZD fix. Make SCR work have current flow through very quickly. Make power supply and load safety. An example is if friends use load 5V as a result should use Zener Diode 5.6V sizes etc.