When you want to make a small power supply for digital experimentation, Small 5-volts DC Regulator. Everyone will tell you, the famous 7805 is best. Because it is easy to find and inexpensive.
But we have many ways to build a small 5-volts DC Regulator circuit. Using transistors are interesting. It will save you money when you have old parts in your store.
There are 4 circuits, as follows. (see below)
Frist—5 volts Lab Power supply for beginner
My friends who like to experiment with digital circuits. It requires a stable voltage, 5V Lab power supply. In the hurried time. But cannot buy the integrated circuit.
Let’s use the transistors to build the 5v voltage regulator circuit.
Some friends have the old equipment. You may be able to apply it.
In the circuit, maybe use many transistors, TIP31, TIP41, MJE3055, and others instead of 2SC1061.
The Zener Diode—uses 9V 0.5W or 1W.
For transformer—uses 6V sizes or 9V 1A only.
You will get the 5V Lab power supply that gives the output current about 1A.
Second—5 volts Linear Power Supply Regulator Using 2N3055
This is 5 volts Linear power supply regulator circuit. It uses electronics parts that found easily, no Zener diode, and an integrated circuit.
They use the transistor 2N3055 and others. Which seek easily use diode perform heal voltage be stable. By diode 1N914 number uses 1N4148 number can replace.
If you do not have the transistor-2N3417 you may use BD139 instead. Using the transformer about 1A-2A current, the output current will give about 1A.
Third—5V/ 0.5A Regulator using 2N3055-TL431
Last—5 volt regulator using LM309
This circuit use LM309K, old DC regulator IC. It is convenient for Digital Circuits. The output voltage is 5V at 2A current.
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