555 Magnetometer

A magnetometer circuit based on a 555 timer and an Electronic Article Surveillance Tag (for the 555 Design Contest).

Category:

Science & Technology

Tags:

• TagMagMovie

[blackcreekresearch]

I neglected to show that the frequency will go DOWN when a field of opposite polarity is applied. In that situation the external field subtracts from the field of the coil and causes the core to saturate later, which makes the current waveform rise more slowly. When the frequency is being reduced, a point is reached where the external field completely cancels the average coil field, and the frequency will begin to rise again. Care must be taken if this circuit is used in a feedback loop

[MilanKarakas]

Wow, that is much simpler version than classical fluxgate magnetometer. I will put that one on my 'to do' list.

I hope it is sensitive enough to detect disturbance in earth's magnetic field due to solar activity, so that I can make aurora borealis warning system - not to miss any aurora borealis display again in next year or two (2012/2013).

Thank you for sharing it with us.

[douro20]

So this uses a saturable reactor as the sensor. I've never really understood how these things work though.

[uniment]

spiffy!

[sonicase]

not bad for utility