Adjustable Voltage Regulator 30V Circuit

For Testing Electronic circuits or components and for Bench Power Supply we need Adjustable Voltage Regulator to provide Voltage between 0.7V to maximum 30V or more. Here Simple Adjustable Voltage Regulator 30V Circuit using LM723 designed with minimum external components.




IC LM723 from Texas Instruments is a voltage regulator designed primarily for series regulator applications. It can supply output current in excess of 10A possible by adding external transistors (refer datasheet). This IC consumes low standby current and these ICs are used in wide range of applications such as a shunt Regulator, Current regulator or a temperature controller.

Circuit Diagram

Components Required (BOM)

1C11000µFCP_Radial_D4.0mm_P1.50mm1
2C3470µFCP_Radial_D4.0mm_P1.50mm1
3C4100nFCP_Radial_D4.0mm_P1.50mm1
4C5100µFCP_Radial_D4.0mm_P1.50mm1
5C2100nFC_Disc_D3.0mm_W1.6mm_P2.50mm1
6R1680ΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
7R282kΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
8R31kΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
9R58.2kΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
10R62.2kΩR_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal1
11R40.18Ω/5WR_Axial_Power_L20.0mm_W6.4mm_P22.40mm1
12D2, D36a6D_DO-15_P10.16mm_Horizontal2
13D12W10Diode_Bridge_Round_D9.0mm1
14U1LM723_DIP14DIP-14_W7.62mm1
15RV110kΩPotentiometer_Bourns_3266Y_Vertical1
16Q12N6043TO-220-3_Vertical1
17J1, J2Screw_Terminal_01x02JWT_A3963_1x02_P3.96mm_Vertical2

Construction & Working

IC LM723 Comes in different packages we can choose any that suits our application. 0-30V Adjustable Voltage Regulator Circuit here starts with Bridge Rectifier and 30V AC is applied directly to the Bridge Rectifier module.

Rectified DC supply from bridge Rectifier filtered with the help of C1, C2 Capacitors. Then DC supply applied to the V+, Vc pins. Vref pin is connected to the Non Inverting pin and ground through RV1, R1 Resistors. By changing value of RV1 we can change the output voltage levels at Vout pin.

Transistor 2N6043 NPN Darlington Bipolar power transistor Connected at the output for Current control. Schottky Barrier diode D2, D3 are used for Reverse protection.

Inverting Pin and FC Pin connected between R5, R6 Resistors for to take output voltage sample and frequency compensation. Adjustable Vout DC Supply is connected to the screw terminal J2.

Printed Circuit Board

Adjustable Voltage Regulator 30V Circuit Gerber files.

Interactive Board Viewer

     




Leave a Reply

Your email address will not be published. Required fields are marked *