Many electronics circuits and projects for learning in simple ways.

Boosting the Regulator Currents for IC-78xx

Normally 78xx series ICs can be output currents for a maximum 1 A, or in the common usage, it is only up to 0.6A. But we need more boost current up, how to do next?

two-ideas-to-boost-current-for-IC78xx

Boosting Regulator Current using transistor

In this increasing Regulator Current or circuit, the power transistor is used to provide most current to the load, to maintain a constant the voltage, by the little current still through the regulator IC intact.

Let’s say, I want a the 12V voltage regulator, and 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 * Ic. When is this. We need a cooling pad for Q1, which is large enough, it is very hot, may be 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.

Boosting Regulator Current for IC 78xx by MJ2955

10A fixed  regulated Supply using 78XX – MJ15004

Today a friend of me visits at a house. He leads old equipment come to give very plentiful and tell beg for DC power supply 10A 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 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.

10A DC Supply FIX Regulated by IC 78XX and MJ15004

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 circuit will serve to increase current for IC regulator.The R2 acts as the anti-saturation of Q12N3792 and Q2-2N5956. Without R2 will allow the two transistors 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 input power filter to smooth.And C2 serves to prevent interference with the pressure to pay out (Vout).

Increase the current of IC LM7805

This circuit can help enlarge current of power supply circuit that use 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

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This Post Has 7 Comments

  1. Hi, I am confused with the output voltage marking on the circuit diagram, it says +15V, whereas the topic / issue is only 5 volts.
    Is this a typo-error? please do correct, as I like this simple to do/construct project for high current 5 volts circuit.
    Can you tell me the other equivalent of 2N3792 transistor?
    More power to your site.
    Thanks in advance.

  2. hi,i am confused with working of current boosting circuit and calculation that are used in dual polarity 15V power supply. what is requirement of over voltage protection circuit?

  3. if its 7805 will be stabilized to 5v if you put 7815 it will be 15v. the transistors allow a higher current, than the IC delivers by its own.

  4. Hello all…. Finally got the steps to increase the dc current in this page after a long search in internet…
    But i have to know some more suggestions before i do any damage to my device….
    Let comes to the point. I have a poly crystalline solar panel rated 5 watt, 18 volt max, 0.2A. I’m tried to build a solar phone charger and got partial result…. I.e my phone is charging at very slow rate….one percent charge takes nearly 40 mins….
    So i need to increase the current to 1A from solar panel…… Will using the above circuit damage my phone or shall i move on to build.
    If anybody design circuit for my solar mobile charger that would be thanks….

  5. I am looking for a schematic for a good oscilloscope if you have any please can sen me

  6. What are the voltages values of C1 and C2? It is rated 470uF, at what voltage?

  7. Do you have a design for a 0-60VDC, 100A adjustable output, regulated power supply?

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