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Here is a PDF document from Linear Technology, featuring current sense circuits for different applications, including High side, low side, level shifting, high and low voltage, fault sensing, etc: [via]
Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the techniques to do so are as diverse as the applications them-selves. This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents.
Current sense circuit collection - [Link]
20 Amps DC Ammeter using very low value resistance of 0.01 Ω
- Supply voltage. symmetric power (+ -12)
- Maximum current measure. 20A
- With Possibility of increasing the measurement range
- Resolution 10mA
20 Amps DC Ammeter - [Link]
The TL431 is a three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors.
Features:
- Operation from -40°C to 125°C
- Reference voltage tolerance at 25°C
- 1%: A grade
- 2%: standard grade
- Low output noise
- 0.2-Ω typical output impedance
- Sink-current capability: 1 mA to 100 mA
- Adjustable output voltage: Vref to 36 V
TL431: Cost-effective shunt regulator solution - [Link]
This circuit will give you a good, Accurate Watt Meter that can measure various power levels.In the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale.
True RMS Watt Meter – [Link]
