LED Blown AC Fuse Indicator Circuit Diagram
This circuit monitors a AC fuse. In this circuit, the LED indicator shows whether or not the fuse is blown.
| PARTS LIST | |
| R1 | 1MΩ |
| R2 | 100Ω |
| R3 | 1kΩ |
| C1 | 0.47µF 250V |
| C2 | 0.47µF 250V |
| D1 | 2.7V 0.5W Zener Diode |
| D2 | 5.6V 0.5W Zener Diode |
| D3 | LED |
| Q1 | BC547 |
| F1 | FUSE |
This fuse indicator circuit makes an LED light up if a fuse blows, this gives a quick indication if the fuse has open and the LED can be sited on the front or rear panel saving time when fault finding.
This blown fuse detector will work with a wide range of AC supply voltages from 30V to 300V and good for use with few milliampere to many amperes fuse.
Don’t touch any component, when circuit is connected to the AC power.
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Nice, simple, useful circuit.
Please elaborate on the purpose of R1. It appears circuit would work OK without it. Might add protection of LED and/or transistor from voltage spikes or transients?
can you please tell me what can i add to this circuit to protect LED and transistor on spikes thanks