Adjustable 0-30V 2A Laboratory DC Power Supply

  

 PCB of Cheap adjustable 0-30V 2A Laboratory DC Power Supply

This 0-30V power supply is the variable voltage Regulator at 2A max, by used IC-723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 2amp.
It suitable for general electronics work shop. Because it is a simple circuit and easy circuit. In addition to this has the over current protection as well.
This circuit is designed using LM723 voltage regulators IC –DIP 20pin maintain a constant voltage, and a power transistor as the way through the current to can be used up as wanted.
The circuit was designed also with overload protection or short circuit in the output. The amount of current flow will not exceed the set. Because it is monitored constantly by R4.
When the current flows through the R4, until the 0.6V voltage drop across it. Making Q3 runs short the bias voltage between the base-emitter of Q2, it stopped working. Now, the Q1 stop working because does not has the bias voltage to base pin its, The output voltage is zero or down quite a close to zero.
The potentiometer VR1 acts as adjust the voltage that enter to the LM723 for the volt output by you want. By the our circuit can adjust the voltage output from 0V to 30V.
In use real, because the properties of the transistors used and values error of each device. Therefore, if the circuit can not be supply up to 2 A. Try changing the value of R4 is a lower value, until has the maximum current desired. Should be to use transformer 3A. The Transistor to Hold Heat sink as well.

 

Scientist invent the woundplast MP3 that can work without battery. The MP3 does not need caught in the collar or pocket, as long as pasting your skin can play beautiful music.
It can not help but think of O+ Music Campaign, in such event, songs can be played on different media in promotional equipment.
This trendy looking MP3 is small, but perfectly formed, with play / stop button, and flexible speaker. It does not require batteries, the body heat emitted is enough to make it work properly. Shortcoming is that this MP3 capacity is very small, can hold an album of songs, and the volume can not be in accordance with the actual needs of the people to adjust.
Although we have not determine what the sound of Woundplast MP3 output, but the concept itself is worth exploring. When you exercise, or do not want to take up your hands, but you want to listen to music, this MP3 will come in handy by design.

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