Free electronic circuit design and schematic diagram
Common mode rejection ratio (CMMR) is one parameter that specify the instrumentation performance. LM4250 is high performance op-amp which is characterized by very low power consumption. With special arrangement as shown in the following schematic diagram, the instrumentation amplifier circuit will be featured with calibration to maximize the CMMR performance.
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The following schematic diagram shows a method to reduce power consumption without sacrificing the bridge signal output level of a strain gauge. Many situation will be applicable for this strain gauge bridge signal conditioning circuit, where continuous output is not a must. In the long time frame, this circuit will in idle state for almost all the time, with only […]
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This is a 4-range AC millivolt meter circuit. This circuit is used to measure a AC voltage in millivolt range. This circuit has frequency response of a few Hz to about 50 kHz. The non-linearity of the rectifier circuit is eliminated by placing the rectifier inside the op amp feedback path. This circuit read the input signal’s full-wave rectified average. […]
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The schematic diagram below show signal conditioning circuit for remote current loop temperature transmitter. This thermocouple temperature transmitter is loop powered, means it doesn’t need its own power supply since the supply is provided by the current loop receiver. Thermocouple is basically a junction of two different metallic material that measures the temperature difference. This thermocouple signal conditioner circuit is […]
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Remote sensor might cause a trouble if it’s a passive type, has very low power output, and should be connected with relatively long cables. By supplying a current or voltage source through its connection wire, it’s possible to make long enough wiring without suffering much noise/interference. The following schematic diagram show a circuit consist of LM10 to make a remote […]
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This is a Low-Cost Accurate Square-Root Circuit. This circuit is used to provide a square-root function with a good accuracy. The benefit of This circuit is cheap. This circuit produce a current output which can be used to be converted to voltage by a summing junction current-to-voltage converter or to drive a meter directly. This circuit requires 15V supply. The […]
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Another application of OP-AMP is differentiator. Differentiator circuit produce an output if the input is changing. The output can positive or negative, depends on the change of the input: whether it’s decreasing or increasing. This circuit is a bias stable. The current is produced by the rate of change of input voltage because the inverting input is grounded. Here is […]
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