tag:blogger.com,1999:blog-8226950546477403054.post2419316429273667147..comments2018-11-17T15:55:55.727+05:30Comments on Homemade Circuits Projects: Simple 1.5 V Inductance Meter - Design Tutorial with DiagramSwagatamnoreply@blogger.comBlogger11125tag:blogger.com,1999:blog-8226950546477403054.post-3095867493160249852014-10-30T10:54:57.000+05:302014-10-30T10:54:57.000+05:30Hi Abu HafssThis looks so simple its to good to be...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 RobinRobinhttps://www.blogger.com/profile/07817279753716122904noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-21504526373001643982014-11-03T21:45:29.000+05:302014-11-03T21:45:29.000+05:30Hi RobinHere is the waveform of the oscillation ht...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 Abu-Hafsshttps://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-26966210439268387762014-11-04T21:32:37.000+05:302014-11-04T21:32:37.000+05:30Hi SwagatumI now understand it fully,I built the c...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 Robinhttps://www.blogger.com/profile/07817279753716122904noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-27184250232820443422014-11-05T20:10:44.000+05:302014-11-05T20:10:44.000+05:30Thanks for testing the circuits!The 555 based desi...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.Swagatamhttps://www.blogger.com/profile/13783312838408713408noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-68288073411155657472014-11-05T23:27:14.000+05:302014-11-05T23:27:14.000+05:30Hi RobinPlease note that each time the circuit is ...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-Hafsshttps://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-6590208016084238262015-08-14T20:22:21.000+05:302015-08-14T20:22:21.000+05:30Hi Abu Hafss,Its a simplest one...thanks for shari...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 sutarhttps://www.blogger.com/profile/07713669722209089550noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-82109399306328915472015-08-15T15:19:04.000+05:302015-08-15T15:19:04.000+05:30Hi Vishal Sutar1. Yes.2. Yes.3. Please take note o...Hi Vishal Sutar<br><br>1. Yes.<br>2. Yes.<br>3. Please take note of my post of Nov. 5, 2014.Abu-Hafsshttps://www.blogger.com/profile/05225176577543770280noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-27852131636355121052018-09-20T19:08:15.000+05:302018-09-20T19:08:15.000+05:30Hi a question, how did you get the 50000 constant ...Hi a question, how did you get the 50000 constant figure in the frequency calculation? Is that a bc546 characteristic? What if I use another npn such as n2222 or others? Does that constant change?<br>Thanks!Federiconoreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-73848878216636411572018-09-20T19:42:57.000+05:302018-09-20T19:42:57.000+05:30Hi, I am not very sure since it was not written by...Hi, I am not very sure since it was not written by me.<br><br>However for a square wave frequency the standard formula seems to be like this IL = Api / 16fL<br><br>where IL is the current through the inductor, A is the RMS amplitude of the square wave frequency, pi= 22/7, and f is the applied frequencySwaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-75994651140314538552018-09-20T19:44:06.000+05:302018-09-20T19:44:06.000+05:30you can use any similar small signal transistor, i...you can use any similar small signal transistor, it is definitely not critical...2N2222 will work without any issues.Swaghttps://www.homemade-circuits.com/noreply@blogger.comtag:blogger.com,1999:blog-8226950546477403054.post-34685125732959701332018-09-21T00:34:09.000+05:302018-09-21T00:34:09.000+05:30Thanks!Thanks!Federiconoreply@blogger.com