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building a storm detector part 3 schematic Schematic of the storm detector. It is built with modern Silicium transistors on the basis of the (More) Schematic of the storm detector. It is built with modern Silicium transistors on the basis of the old schematic of the sixties. Figured it all out and found that this schematic is the most flexible to publicate on YouTube. Works from approx. 1,5 volt to 15 V or even 18 Volt. Though resonance and receiving will probably be better with a triode tube or FET at the entrance. Reason: the higher impedance of a triode or a FET, so the L-C combination (tank circuit) on 4,5 KHz can swing more freely and give more energy to the amplifier stages. In the drawn schematic resonance is acceptable at 4.5 KHz, though there is also a weak resonance on other frequencies, for instance about 10 KHz. Also the low impedance of the grounded emitter figuration muffles the tank circuit a bit. All the other things (computer, modem, 1 Watt amplifier, FAX program) are optional and not necessarely needed for receiving. I use this only to make the reception on 4,5 KHz visible on a computer screen. You can also connect an oscilloscope directly to the output of the 2 transistor amplifier and study (see) what you "hear". I could see/hear radio disturbance caused by my TV set and computer, and a vacuum cleaner. Did not "see" storms or thunderstorms coming. Probably in the future I will report how this schematic works when really a thunderstorm is coming. NOTE: (NOT DRAWN): connect on each transistor a capacitor of 220 PF from the basis to the collector to prevent detection of normal radio stations. Otherwise you will also hear some (a) radiostation(s). The computer program is FAX 4.1. freeware and runs under DOS, it is already on my channel. The modem is nothing more or less then an Opamp, that changes the received signal into square pulses for the fax program. Good information about it all in "Das FAX/SSTV Praxisbuch fur Funkamateure", Ferdi Schmid DK5BI, Germany. DARC Verlag, Baunatal, 1994. ISBN 3-88692-019-4. Text of the book is in German. (Less)
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