Electronic Fuse

Simple Electronic Fuse / Low Pass Filter

Part's List:

R - 100
Q1 - TIP3055 (heatsink required)

Q2 - BC212 (PNP)
C1 - 1n
C2 - 100n

LX - Coil Values:
0.1 Ohm - 4.3A
0.2 Ohm - 3.3A
0.47 Ohm - 1.9A
1 Ohm - 500mA

LX is a coil with any kind of ferrite core. Resistance can be achieved using a magnetic 26 Gauge wires or similar.

Technical Specifications:

Supply Voltage: 2 - 30V
Output Current: 100mA - 4.3A

About this Circuit

This is adjustable elctronic fuse that can be used to protect power supplies from short circuits or can be also used to limit the current usage. It can be adjusted for currents from 100mA up to 4.3A.