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LM7805 voltage regulator

2018-02-26 18:02  
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Voltage regulator IC’s, with 3 pins, from LM7805 and LM7812 series are excellent for usage in voltage regulator circuits. If you need higher currents, up to 3 A, you must add a complementary transistor, T2 in this schematic. In a normal design, in case of a shortcircuit, the power dissipation can be very high. This problem can be solved using the voltage regulator design presented on aPowerSupply.com – voltage regulator circuit.

7805 voltage regulator circuit diagram

lm7805 voltage regulator circuit

Components values

R1 = 6.8Ω
R2 = 0.22Ω/3W
R3 = 10Ω
R4 = 150Ω/1W
C1 = C2 = 100nF
T1 = BD240C with heatsink
T2 = 2N2955 with heatsink
IC1 = 7805

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