4-20mA to 0-5V Converter Circuit Diagram
Introduction
In industrial automation, 4-20mA current loop is a widely used protocol for transmitting analog signals over long distances. However, many electronic devices and microcontrollers require a 0-5V analog signal for processing. Therefore, a converter circuit is needed to convert the 4-20mA current signal to a 0-5V analog voltage signal. In this article, we will discuss a simple circuit diagram for converting 4-20mA to 0-5V.
Circuit Diagram
The circuit diagram for the 4-20mA to 0-5V converter is shown below:
+---------------+
| |
| 4-20mA Input |
| |
+---------------+
|
|
v
+---------------+
| |
| R1 (250 ohm) |
| |
+---------------+
|
|
v
+---------------+
| |
| OP-AMP (LM324) |
| |
+---------------+
|
|
v
+---------------+
| |
| R2 (1 kohm) |
| |
+---------------+
|
|
v
+---------------+
| |
| R3 (10 kohm) |
| |
+---------------+
|
|
v
+---------------+
| |
| 0-5V Output |
| |
+---------------+
Components
- R1: 250 ohm resistor
- OP-AMP: LM324 operational amplifier
- R2: 1 kohm resistor
- R3: 10 kohm resistor
How it Works
The circuit works as follows:
- The 4-20mA current signal is applied to R1, which converts the current signal to a voltage signal.
- The voltage signal is then amplified by the OP-AMP (LM324) to increase the signal strength.
- The amplified signal is then divided by R2 and R3 to produce a 0-5V analog voltage signal.
Calculations
The output voltage (Vout) can be calculated using the following formula:
Vout = (Iin * R1 * R3) / (R2 + R3)
where Iin is the input current (4-20mA) and R1, R2, and R3 are the resistors values.
Advantages
- Simple and low-cost design
- High accuracy and linearity
- Can be used for both analog and digital signals
Applications
- Industrial automation
- Process control systems
- Data acquisition systems
- Microcontroller-based systems
In conclusion, the 4-20mA to 0-5V converter circuit diagram presented above is a simple and efficient way to convert 4-20mA current signals to 0-5V analog voltage signals. The circuit is widely used in industrial automation and process control systems, and can be easily implemented using standard electronic components.
