Current-shunt-amplifier
This circuit measures the power supply current of a circuit without using a current shunt resistor: R1 is only 3 cm of #20 gauge copper wire. A length of the power distribution wiring can be used for R1. The MAX420's common mode voltage range (CMVR) includes its own negative power supply; therefore, it can both be powered by and measure current in the ground line.
The described circuit utilizes a minimalistic approach to current measurement by employing a short length of copper wire as a sensing resistor. Specifically, R1 is a 3 cm segment of #20 gauge copper wire, which serves as a low-resistance path to measure the current flowing through the power distribution wiring without the need for a dedicated current shunt resistor. This design is particularly advantageous in applications where space and component count need to be minimized.
The MAX420 operational amplifier plays a crucial role in this configuration. It is designed to operate with a negative power supply, which allows it to measure currents flowing in the ground line effectively. This capability is significant as it enables the device to monitor the current without introducing additional components that could affect the accuracy and integrity of the measurement.
In practical applications, the circuit can be integrated into various electronic systems to provide real-time monitoring of power supply current. The use of a copper wire segment as a sensing element offers a low-cost solution while maintaining adequate performance characteristics. The MAX420's ability to handle a wide common mode voltage range ensures that it can function reliably across different operating conditions and power supply configurations.
To implement this circuit, careful attention should be given to the layout and connections to minimize noise and interference, which could affect the accuracy of the current measurements. Additionally, the selection of the copper wire length should be optimized based on the expected current levels to ensure that the voltage drop across R1 remains within acceptable limits for accurate readings.This circuit measures the power -supply current of a circuit without really having a currentshunt resistor: R1 is only 3 em of #20 gauge copper wire. A length of the power distribution wiring can be used for Rl. The MAX420"s CMVR includes its own negative power supply; therefore, it can both be powered by and measure current in the ground line. 🔗 External reference
The described circuit utilizes a minimalistic approach to current measurement by employing a short length of copper wire as a sensing resistor. Specifically, R1 is a 3 cm segment of #20 gauge copper wire, which serves as a low-resistance path to measure the current flowing through the power distribution wiring without the need for a dedicated current shunt resistor. This design is particularly advantageous in applications where space and component count need to be minimized.
The MAX420 operational amplifier plays a crucial role in this configuration. It is designed to operate with a negative power supply, which allows it to measure currents flowing in the ground line effectively. This capability is significant as it enables the device to monitor the current without introducing additional components that could affect the accuracy and integrity of the measurement.
In practical applications, the circuit can be integrated into various electronic systems to provide real-time monitoring of power supply current. The use of a copper wire segment as a sensing element offers a low-cost solution while maintaining adequate performance characteristics. The MAX420's ability to handle a wide common mode voltage range ensures that it can function reliably across different operating conditions and power supply configurations.
To implement this circuit, careful attention should be given to the layout and connections to minimize noise and interference, which could affect the accuracy of the current measurements. Additionally, the selection of the copper wire length should be optimized based on the expected current levels to ensure that the voltage drop across R1 remains within acceptable limits for accurate readings.This circuit measures the power -supply current of a circuit without really having a currentshunt resistor: R1 is only 3 em of #20 gauge copper wire. A length of the power distribution wiring can be used for Rl. The MAX420"s CMVR includes its own negative power supply; therefore, it can both be powered by and measure current in the ground line. 🔗 External reference