A simple power supply circuit that can be used at laptops or other devices it's shown in this schematic .
This Laptop power supply schematic is based on a LM317 regulator an can be adapted to obtain the output voltage that we need.
If we want to modify the output voltage we must change the R4 resistor value ( the supply voltage must be at least 3.6 V above the expected output voltage).
The transistor Q1 it’s a MJ2955 or similar and should be heatsinked.
Diode D1, D2 and D5 are 1N5401 or similar type .
If you want to change the output voltage you need to change the value of R4 resistor like in this table :
| R4 value | Output voltage |
| 750 910 1.2 1.5 1.8 2 2.7 3.3 3.6 4.3 |
5 6 8 9 10 12 15
18 |
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