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Electronics Schematics - S

Amp Meters and Current Monitors -
Sensors and Detectors

AC Line Current Detector:

Active feedback IC serves as current sensing instrumentation amplifier: 07/24/03  EDN-Design Ideas / High-speed current sensing presents a designer with some significant challenges. Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a resistor or a Hall-effect device.

Analog input circuit serves any microcontroller: 12/20/2001 EDN - Design Ideas / The simple ADC in Figure 1 is perfect for getting analog signals into a purely digital microcontroller. Using just five surface-mount parts, you can assemble it for less than 50 cents (1000), which is approximately half the cost of a single-chip-ADC approach in the same volume.

Circuit Breaker Monitors Leakage Current: 06/21/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Circuit measures currents in dc servo motor: 12/06/2001 EDN - Design Ideas / The simple circuit design in Figure 1 lets you measure all components of a current flowing in a dc servo motor. The rectified output of the circuit uses ground as a reference, so you can measure the output by using a single-ended A/D converter. The current-sense resistor, R1, has a value of 0.

Circuit Measures Small Current in DC Servo Motor: 12/07/01 EDN-Design Ideas 

Circuit Senses High Side Current: 03/01/01 EDN-Design Ideas / (One of several circuits in PDF) The accurate, high-side, current-sense circuit does not use a dedicated, isolated supply voltage, as some other schemes do.

Current Sense Amplifier Handles High Voltages: 11/06/97 EDN-Design Ideas

Current Sense IC Prevents Over-current Damage: 04/25/96 EDN-Design Ideas

Current sensing scheme improves PFC on/off sequences: 06/27/2002  EDN - Design Ideas /  PFC (power-factor-correction) preconverters typically use the step-up, or boost, configuration, because this type of converter is relatively easy to implement (Figure 1). However, this topology requires the output voltage to be higher than the input voltage. When this condition is not the case—for example, with on/off sequences or under load conditions—some inrush current flows thro....

Current Sensing for Crossbars: Maxim APP 391: Mar 01, 2001 / Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This application note describes a low-cost, space-saving and accurate current sensing and sharing scheme using MAX4372.

High Side Current Sensor has Period Output 1: Maxim APP 1084: May 31, 2002

High Side Current Sensor has Period Output 2: 03/07/02 EDN-Design Ideas  / PDF contains multiple circuits - scroll to find the one of interest

High side current sensor monitors negative rail: 04/17/03  EDN-Design Ideas / All dedicated current-sense amplifiers provide high-side sensing on a positive supply, but you can adapt such circuits for monitoring a negative supply (Figure 1). The positive-supply pin, V+, connects to the system's positive supply, and the ground pin, GND, connects to the negative supply, VEE. That arrangement monitors the negative supply and provides a positive output voltage for the extern..

High Accuracy Current Sense Amplifier Enables Current Sensing and Current Sharing: Maxim APP 391: Mar 01, 2001 / Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This application note describes a low-cost, space-saving and accurate current sensing and sharing scheme using MAX4372.

Integrator Forms Pico ammeter: 07/17/97 EDN-Design Ideas

MOSFET Current Sensing: Method of mirror current sensing a MOSFET

Simple circuit provides high side current sensing: 10/12/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Solar Current Meter:

Transmitter accurately transfers voltage input: 05/15/03  EDN-Design Ideas / When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4 to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the loop's high noise immunity in harsh environments, and the de facto loop standard within the process-control industry...

Two Sensors Measure Three Line Currents: 09/01/95 EDN-Design Ideas

Voltage Reference improves JFET: 10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's V P and I DSS variations. These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a...


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