Because the components used in this 13.8V power supply circuit there is not much. And most of them are large. Which must be installed on a heat sink. What to watch out, when we connect many IC with parallel form, is the average current flowing through the circuit. Each equally. IC1 is temporarily stopped responding. Because it is overloaded. By earlier, the current of 1A flow through the IC1 and the SCR1 into loaded directly. Not through all transistors.

Note: Q1-Q7 is 2N3055 NPN power transistor. Also, you may use TIP35 High-Power Transistors in TO-247. But it is more expensive than a 2N3055. Better protection Our new Voltage Regulator does one job, simply and effectively — takes an input of 7-40 volts dc and outputs a regulated dc current. If your S5 or S3 sender has 3 or 4 wires then it is either a 0-5v, 0-10v sender or it has a high/low level alarm. Useful on both 12 and 24 volt systems — on 24 volt systems it reduces the voltage down to 12/13.8 volts, and on 12 volt systems it ensures a constant current. As a result, this circuit can keep the level output voltage as well. And, If there are overload or short circuit. It will do not damage too.As an example; a standard Wema Wema 52mm analogue gauges will draw a maximum current of 130mA, so each 3A voltage regulator can supply power for up to 20 standard gauges. Each 5A voltage regulator can supply power for up to 38 standard gauges.

Of course, you can buy a power supply that simple and effective with a variety of sizes. But if you build them with your own or your friends. It will be a great time while creating this project. And when completed, runs in its function. It will very proud. Figure 1 circuit, in normal conditions, the voltage between pin Adj and pin output is equal to a 1.25V stable that flow pass R1, R2 will have constant as well. In normal IC-LM338 Can supply up to 5 amps, but to load current maximum 20 amps, we will bring it to parallel.So, making the voltage output of this circuit is slightly changed the switch from 14V (under no load) It may be of 13V in fully loaded conditions (regulation). Imagine, you have a lot of power transistors, 2N3055. Because it is popular in the transistor power amplifier. This 13.8V power supply circuit uses a regulator IC, LM340T-15. It keeps the level of constant voltage of 15V. Inside this IC has short circuit protection and prevents overheating. At this level, it will be maintained voltage is better than on the electric of a car. Its output voltage can be changed from 11V to 16V.

By parallel with the transistor Q2, from the Q3 onwards. Each transistor can increase the current of 5A. To increase the current up. When to connect these 7 transistors Q1-Q7 to complete. It makes can boost up to 30A. First, see this circuit. It is a Zener diode and transistor regulator that we are familiar with well. In the short-circuit conditions. Or Overload, Or Using too many currents. The Q2 is pulled by the current of 5A. Until the voltage of 0.75V drop across R5 – 0.15 ohms. (emitter pin of Q2). Then, this voltage to gate lead of SCR1. Next, it is enough to trigger SCR1 works immediately. The SCR1 is working to hold. Until the power supply is cut off. Which automatically resets itself in this manner is called an Electronic circuit breaker. How much output voltageWhen IC1 has been heating up over defined transistor. It stops! Of course, there is no current to the transistor. So, It gradually reduces heat down. IC1 will return to run again. For example, the transformer if you want 30A output current. So you need the least of 30A transformer. It is so big. In 30A output, if you cannot buy a 68,000uF 25V electrolytic capacitor. You may use 10,000uF 25V x 6 connect together in parallel. It saves money and easy.