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I have tried to modify slightly the Elektor scheme. Here are the files. The circuit is not tested. If anyone dares to try, go ahead. I do not know if there is an error. Greetings.
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Amplifier correction schematic.Tested. Very poor oscillator and phase inverter .Change!!!
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Thanks for the advice SCS. I have not yet tested this detector, but has caught a bit of attention. I'll try to change some things more, and over time will prove it. Greetings.Comment
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What did you do, dear Eduardo?Comment
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I have done nothing so far with this detector, for lack of time. Once I have more free time, I will investigate more thoroughly this project, and try to make one. Greetings.Comment
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Is this project on the net anywhere ?Comment
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It refers to Elektor November 1981, as posted at http://www.geotech1.com/forums/showt...160#post171160Comment
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IMHO the Elektor Tx is superior to Eduardo's, but Elektor's Rx sucks.
Point is that Elektor Tx is a looong time predecessor to my re-discovered tank locked oscillator that has exceptional harmonic purity, and is far better than the vast majority of VLF rigs of nowadays. It can be modernised by using MOSFETs in output, and also configure it to full H-bridge. Using a slightly modified topology it is possible to have all critical phases in discrete steps extracted directly from a PLL. The whole point is that conduction angle is dead on (twice) 50% and at exactly 0° so it just can't get any better. OK, it can be complicated a little and employ some other conduction angle such as (twice) 33% for even better signal purity, but I don't see the point.Comment
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It is true that elyapimi VLF uses PLLs to establish phases, and it is a straightforward method of obtaining phases, but it does not use the best part - a tank locked loop. Elektor's Tx is far better. It is possible to make a single-ended tank locked loop and benefit from this concept even in already finished detectors. The relevant topic on Geotech is www.geotech1.com/forums/showthread.php?19970Comment
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