Here is the Current booster circuit using transistors. Normally 78xx regulator series ICs can power max output currents of 1 A. Or in the common usage, it is only up to 0.6A. But we need more current up. You must buy a new one, like a 78H05 voltage regulator, LM350, or LM338, etc.
But it is expensive. How do you do? Read this may be alternative good for you. Don’t worry you can use the current booster circuit for 7805 (78xx).
Current booster circuit for 7805
In this increasing Regulator Current or circuit, the power transistor is used to provide most current to the load, to maintain a constant voltage, by the little current still through the regulator IC intact.
Let’s say, I want a 12V voltage regulator, and the current output voltage at 5A, I must to use an IC No. 7812 and it can take a transistor number MJ2955 or TIP2955. The input voltage is enough I think that about 20V, which voltage drop across the transistor is approximately 8V. And it takes about 40Watt energy, which can be calculated = Vce x Ic. When is this. We need a cooling pad for Q1, which is large enough, it is very hot, maybe cause damage.
If you want to add current to the IC 79xx or negative voltage, you can also easy to make, but simple NPN transistor type 2N3055 is only a number.
10A fixed regulated Supply using 78XX – MJ15004
If you have a lot of old pieces of equipment. You may build a 10A DC power supply circuit.
That be simple please, when I sees the equipment that him has had already. Then take this circuit see use 78XX integrated circuits. Have many the number and Transistor power number M15004 that can enhance current. Get tall arrive at 10A.
The important aspect is must use the Transformer that be appropriate give current 10A More than. And use C-Filter 10000uF sizes go up with. The detail is other see in the circuit has leisurely sir.
Increase current of 7805
But above circuit not have protection over load
We need to use the below circuit!!
Sometimes we want to use. high current at a dc regulator 5v 3a. We can do this by using the voltage regulator IC1 positive constant number 7805.
The Q1-2N3792 and Q2-2N5956 of the circuit will serve to increase current for the IC regulator.
The R2 acts as the anti-saturation of Q12N3792 and Q2-2N5956. Without R2 will allow the two transistors to do not work. The output current can be from IC1 alone.R1 specify the bias current to IC1. And the current output of you against too much saturated with.
The C1 functions in the input power filter to smooth. And C2 serves to prevent interference with the pressure to payout (Vout).
This circuit can help enlarge the current of the power supply circuit that uses an Ic regulator so well. you can use other IC 7805,7809, IC-7812, and IC7815.
Q1 is BFX88 or Equivalent
Q2 is BD132 or Equivalent
Learn how to increase the current of 7805 with 2N3055 transistors
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This circuit requires enough power supply. Do you have this one? If you do not have it. Look:Learn Many Power supply circuits
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