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Education Tool for AC/DC EMF Measurement

This project received 6 bids from talented freelancers with an average bid price of $493 USD.

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Employer working
Project Budget
$37 - $62 USD
Total Bids
6
Project Description

I am developing an educational tool to detect the transmission and presence of low frequency waves, radio waves, AC electric fields, AC magnetic fields, DC electric fields, DC magnetic fields (6 circuits total). The project must not involve any programming so the design cannot include any microcontrollers. If you are an expert in analog circuit design, this job is for you.

The project is fairly simple. The goal is to have an electrical schematic for each of these 6 circuits. These do not have to be precision instruments, but they should function as the specifications below describe. I'm looking for more than just op-amps. This will involve choosing the right antennas and ensuring that a DC signal is separated from an AC signal. I expect you are an electrical engineer, an electrical engineering student, or a skilled technician.

Each of these circuits should be able to run on 5 or 6 Volts, and have an analog output indicating signal strength of 0 to 5 Volts.

Circuit 1: Detection of Low frequency waves
Design a circuit that can detect low frequency waves that fall within the range of 500 Hz to 100 KHz. A steep linear falloff outside of this range is desirable. Choose 1 or more than 1 antenna type in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should be range from 0-5 volts to correlate from 0.0 - 10 mW/cm^2.

Circuit 2: Detection of Radio waves
Design a circuit that can detect radio waves that fall within the range of 100 KHz to 100 MHz. A steep linear falloff outside of this range is desirable. Choose 1 or more than 1 antenna type in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should be range from 0-5 volts to correlate from 0.0 - 10 mW/cm^2.

Circuit 3: Detection of an AC electric field
Design a circuit that can detect the AC component of an electric field that falls within the range of 40 Hz to 2000 Hz. Choose 1 or more than 1 antenna type, or other sensor in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should range from 0-5 volts to correlate from 0 - 1000 V/m.

Circuit 4: Detection of an AC magnetic field
Design a circuit that can detect the AC component of a magnetic field that falls within the range of 40 Hz to 2000 Hz. Choose 1 or more than 1 antenna type, hall effect sensor, or other sensor in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should range from 0-5 volts to correlate from 0 - 100 mG.

Circuit 5: Detection of a DC electric field
Design a circuit that can detect the DC component of an electric field that falls within the range of 40 Hz to 2000 Hz. Choose 1 or more than 1 antenna type, or other sensor in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should range from 0-5 volts to correlate from 0 - 1000 V/m.

Circuit 6: Detection of a DC magnetic field
Design a circuit that can detect the DC component of a magnetic field (static flux density). Choose 1 or more than 1 antenna type, hall effect sensor, or other sensor in a triaxial configuration. The output of the each antenna is summed (does not need to be a true Euclidean norm). The output should range from 0-5 volts to correlate from 0 - 100 mG.

Required: Each schematic must show the type of electrical component, the electrical value (i.e. 4 kOhms), and be low-cost commerically available (non-obsolete). The dimensions, such as the size, diameter, etc of the antennas, and details of the shielding must be described. Specifics about the component type if important, such as Tantalum over Ceramic, should be specific. The final product of your work will be a pdf, word document, and or image files. 10% error is allowed for all of the numbers described above.

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