Electronic Fuse DC and AC
You can use either direct current (up to 2 A and 20 Vdc) as alternating current (up to 3.5 A AC and 15 VDC). Replaces conventional fuses.
| Component | Type-Value |
|---|---|
| D1, D4 | 1N5404 |
| D5 | RED 5mm |
| T1 | TIP41 - Transistor |
| T2 | BC337/2A - Transistor |
| T3 | BC548/2A - Transistor |
| R1, R2 | 1 Kohm - Resistor |
| R3 | 10 Kohms - Resistor |
| R4 | 33 Kohms - Resistor |
| R5 | 47 Kohms - Resistor(see note) |
| C1 | 4,7 nF - Capacitor |
| L | Heatsink L type |
Circuit
The circuit values are calculated for a voltage of 20 volts. The R5 value depends of max current used.
- 600 mA R5=47 Kohms
- 1,8 A R5=56 Kohms
- 3,3 A R5=68 Kohms