Tsukure Mad Labs Variable 150mA DC Voltage Supply

To get a regulated power supply we use various voltage regulator ICs like 7805, 7812 etc but they all provide fixed value of output. For variable voltage regulation we  are making a Voltage Regulation Circuit using LM723. This is one of the popular IC used for the Voltage regulation.

For this voltage regulator circuit using LM723 IC, we just need to add few resistors and capacitors with the IC as per the circuit diagram given below. By giving 9v input power supply, we will be able to adjust the regulated supply from 4v to 8v by using the potentiometer in the circuit. The benefit of using this IC is that it can provide an excessive quantity of current of up to 10A, by connecting an external pass transistor with proper circuitry.

The supply voltage of the LM723IC is maximum 40v and the output ranges from 3v to 37v with a 150mA of output current without using an external pass transistor.

Components used in this module...

Find out more about the components used in this STEM Module.

Let's Get Started!

Below you will find a list of bits to gather before hand, followed by a detailed schematic. Using a breadboard lay out the components and connect them together as shown. Alternatively you can purchase this module from our shop and simply solder the components in the places indicated on the quality assured printed circuit boards provided.


What You Need...


1 101 (100pF / 0.1nF) Capacitor (Ceramic)
1 104 (100nF / 0.1uF) Capacitor (Ceramic)
2 PCB Mount 2-Pin Screw Terminal Block Connector (Other)
1 10K
[ Brown, Black, Black, Red ]
Resistor (0.25 Watt)
1 10K Resistor (Potentiometer / Variable)
1 LM723 Voltage Regulator

NB: Any resistor colour codes specified relate to 5 band resistor codes, the 5th band has not been shown intentionally. The 5th band indicates the resistor tolerence, we use only the highest tolerence resistors in our products.


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