Introduction
We use power supply everywhere in the electronics industry. It has a wide range of applications and hence there are different power supplies that designers have made. It includes regulated unregulated, constant voltage, and constant current power supplies. So, in this tutorial, we are going to “Constant Current DC Power Supply Circuit”. A constant current power supply is basically a DC power source that can operate a series of pass transistors which is controlled by a high gain operational amplifier. The following circuit that we are making is simple and easy to make. Moreover, the circuit also contains a transformer and bridge rectifier which is good for beginners to learn.
Hardware Required
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Transformer AC output | 0-9 V | 1 |
| 2. | Diode | 1N4007 | 4 |
| 3. | Voltage Regulator IC | LM317 | 1 |
| 4. | Capacitor | 100μF/16V, 0.1μF | 1, 1 |
| 5. | Resistor (Depends on your Requirement and calculate using I out) | – | 1 |
| 6. | 2-Pin Connector | – | 1 |
Circuit Diagram
Working Explanation
This Constant Current DC Power Supply Circuit has used the first stage of the transformer where it steps down the voltage to 0-9V. After that, there is a bridge rectifier circuit that is made from diodes. It converts both input polarities into pulsating DC. abut, it still has ripples in it which get filtered by the capacitor C3 wired in the circuit. We give the output to the input pin of IC. This IC has an ADJ pin where we connected to the output side. You can observe the constant current output at Pin 2 of an IC across the resistor R1.
Application and Uses
- In monitoring systems
- Automated equipment.
- Medical devices.
- Electronic gadgets and appliances, etc
