Saturday, May 13, 2017

LM723 Adjustable Power Supply with Over-Current Protection

DIY Adjustable power supply circuit using LM723

Make a power supply circuit using IC LM723 adjustable regulator is very nice to use the power supply that requires a large voltage-ampere. Power supply circuit has a DC output voltage that can be regulated output from 0V up to 35V and it also depends on the input voltage. For output currents ranging from 2.5 Amperes to 10 Amperes. This circuit is also equipped with over-current protection, where there are LED indicators that work when the power supply has a high current surge then the led will light up. These LED lights can we indicated that the required voltage on the electronic components is quite high. Let's try to make it, here I present the circuit along with PCB layout and also video tested using transformer 10A output 27VAC.

The Circuit Diagram:
LM723 Adjustable power supply circuit with over current protection indicator
At the circuit above power supply circuit is using IC LM723 and the over current protection as labeled "LED OVERLOAD" which is controlled by the transistor B560 / BD140. And also there are some components driving the transistor A671 to the equation that can be used in addition to A671 that TIP42 / TIP32. And the last transistor for booster current is 2N3055 / TIP3055 / TIP35C, you can also parallel it to raise the voltage current, as above diagram with label "X" and "Y". For booster current transistor I use TIP35C for its datasheet you can see in the google search.

PCB Layout Design:
PCB Layout Adjustable power supply LM723

The Transistor:
TIP35C TIP32 BD140

IC LM723:
LM723 IC

Video Tested Adjustable DC Power Supply using IC LM723 with Over-Current Protection 

Yesterday I am successfully making the booster current using 6x TIP35C. And also making the power supply box, using wood and some acrylic. And the aluminum plate as box also as heatsinks the transistor.  Below the parts and wiring diagram:

10 Ampere adjustable power supply

Wiring diagram power supply circuit

transistor current booster wiring diagram

Already power supply circuit

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.


can i use 2sc5200 to replace tip35c? and what the amperage output for 4x2sc5200? im using 20A transformer with output voltage 32vac

the output voltage is about 30vdc 8A output.