tag:blogger.com,1999:blog-8226950546477403054.post5350321714835175348..comments2017-01-20T15:12:41.776+05:30Comments on Electronic Circuit Projects: 1.5 V Inductance Meter CircuitSwagatam Majumdarnoreply@blogger.comBlogger7125tag:blogger.com,1999:blog-8226950546477403054.post-80460907787781421272015-08-15T15:19:04.930+05:302015-08-15T15:19:04.930+05:30Hi Vishal Sutar
1. Yes.
2. Yes.
3. Please take no...Hi Vishal Sutar<br /><br />1. Yes.<br />2. Yes.<br />3. Please take note of my post of Nov. 5, 2014.Abu-Hafsshttp://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-26851883001201271752015-08-14T20:22:21.274+05:302015-08-14T20:22:21.274+05:30Hi Abu Hafss,
Its a simplest one...thanks for sha...Hi Abu Hafss,<br /><br />Its a simplest one...thanks for sharing.<br /><br />I have some question<br />1. Does the calibration depends on cell voltage.<br />2. If so then can i give a fixed 5v supply to this circuit.vishal sutarhttp://www.blogger.com/profile/07713669722209089550noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-42039914363312022282014-11-05T23:27:14.095+05:302014-11-05T23:27:14.095+05:30Hi Robin
Please note that each time the circuit i...Hi Robin<br /><br />Please note that each time the circuit is powered on, it does need to be calibrated. Otherwise, we might get variation in readings.Abu-Hafsshttp://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-72370427631797835072014-11-05T20:10:44.543+05:302014-11-05T20:10:44.543+05:30Thanks for testing the circuits!
The 555 based de...Thanks for testing the circuits!<br /><br />The 555 based design will need different sets of "C" for producing the corresponding sets of measuring range, however the design will not give accurate results with lower capacitance and may show vibrating or oscillating meter needle.Swagatam Majumdarhttp://www.blogger.com/profile/13783312838408713408noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-59076191993929842312014-11-04T21:32:37.808+05:302014-11-04T21:32:37.808+05:30Hi Swagatum
I now understand it fully,I built the ...Hi Swagatum<br />I now understand it fully,I built the circuit and calibrated it and tested 3 other known inductance's ie:47uH and got 53.5uH,4.7mH and got 5.9mH,3.9mH and got 4.9mH.<br />Those figures will give me a good idea of what I've wound.<br />I also built the other circuit with the 100uA meter which may give more accurate results?But have no idea on how to fault find it and split it into smaller sections so as to check that you are on the right track<br />Just getting the above results from that tiny little circuit was a big boost for me <br />Thanks RobinRobinhttp://www.blogger.com/profile/07817279753716122904noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-57554008184699562162014-11-03T21:45:29.073+05:302014-11-03T21:45:29.073+05:30Hi Robin
Here is the waveform of the oscillation ...Hi Robin<br /><br />Here is the waveform of the oscillation <br /><br />https://dl.dropboxusercontent.com/u/20969135/Waveform%20Ind%20Meter.png<br /><br />The frequency of oscillation depends on the L/R time constant comprising the inductor and resistors R1 and R2. The time the waveform takes to change its state is directly proportional to the inductance. In the waveform we see, the time taken for one complete cycle is 2µs for a 100µH inductor.<br /><br />In other words, inductance (100µH) = Time period (2µs) x 50 ..........(A)<br /><br />And we know, Frequency = 1 / Time Period OR Time Period = 1 / Frequency<br /><br />So replacing Time Period in Formula (A), we get<br /><br />Inductance (µH) <br /><br />= 50 x (1 / Frequency) OR<br />= 50 / Frequency (Hz) OR<br />= 50 x 1000 / Frequency (Hz) x 1000 OR<br />= 50,000 / Frequency (kHz)<br /><br />Please note, that this circuit is quite sensitive to the supply voltage and it is fairly good to about 10µH.<br /><br />It is good idea to a have a known value inductor say 100µH fixed in the circuit for calibration purpose. That calibration inductor and the inductor under test may be toggled using a SPDT switch.Abu-Hafsshttp://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-7411677596385896592014-10-30T10:54:57.038+05:302014-10-30T10:54:57.038+05:30Hi Abu Hafss
This looks so simple its to good to b...Hi Abu Hafss<br />This looks so simple its to good to be true,I'm going to try it.<br />Where did you derive that formulae from.<br />Regards Robin Robinhttp://www.blogger.com/profile/07817279753716122904noreply@blogger.com