Excellent ! Thank you for inspiration .... This is a real eye opener for me ! I've been caught up experimenting for last couple weeks at all hours , since I received my oscilloscope , and it really is something how time goes by when you working on a circuit . Always learning and some of the mistakes have been the best lessons . You said it best " Radiofun!" Cheers.

@radiofun232

4 жыл бұрын

Good to hear that! The oscilloscope is THE device in electronics, wish you much pleasure with it.

@rfmachine

Жыл бұрын

😅😅

I built this circuit like 30 years ago when I was 10 years old. Every morning I would wake up early morning to listen to the strange sounds in LF rf spectrum. As I understood later after physics in senior class it is disturbance in ionosphere of earth when particles from sun hits the ionosphere. I may be wrong but that is the likely explanation I can think of of those 'jet like' sounds. They change pitch up and down as sun starts appearing over the horizon.

@shariqkudcs

2 жыл бұрын

The antena I hooked up was a loop antena which was 100 ft long

@radiofun232

2 жыл бұрын

@@shariqkudcs A very interesting project! And still a peculiar radio band. Thanks for your comment.

Thanks for showing the schematic! Very useful!

@radiofun232

4 жыл бұрын

OK, thanks.

i have been searching for this schematic for some time . a decade or so agao i found a global lightning detector schematic in an old publication . later when i had the means to reproduce this device , i could not find the schematic . great video as always , thanks .

@radiofun232

4 жыл бұрын

Thanks, good to hear that. When I reviewed my (very) old video's I could not find the schematic or a clear overview of the circuit either.

I wound a coil with about 500 feet of #28 plastic insulated wire on a 33 material ferrite rod about 3/4 " dia and 12 " long. Very sensitive with very deep nulls. Using this for whistler reception

@radiofun232

5 ай бұрын

interesting!

I have been watching your videos on and off for several years and find them fascinating and easy to follow. Dank u Vel! Can I ask you roughly what frequency the jet engines? 73 Adam M6RDP

@radiofun232

Ай бұрын

Hi, thanks! The original schematic was published in the "Elektronica Wereld" (Dutch magazine) of january 1964. Made with 2 germanium transistors and a loop antenna, made with 200 windings on a wooden frame of 85X85 cm. Coil is paralleled with a cap. of 20 NF (0,02 micro Farad). It tells tells that "storms, atmosferic disturbances, even jet engines and nuclear explosions" can be received. The frequence where this can be received is "in the range of 4 to 5 KC", according to the article.

@M6RDPadam

Ай бұрын

@@radiofun232 Thanks so much for the detailed information. I am looking forward to try the project. Best wishes Adam

Hello Sir, I have to say, I am quite impressed with all the work you are publishing on this channel. You’ve been very generous in showing us many experiments in the field of Radio technology. I’ve been wondering for a long while if the question that I am going to propose would be of any concern … I’ve been doing a research masters in electronic music in The Netherlands, and actually my project has been dealing with abstract radio sounds for the purpose of live music performances … I have managed throughout the first year of my research to circuit bend many fm radio circuits that I have salvaged from old second hand radios that I purchased online… For the moment, I feel kind of stuck with making more progress with this project … since I do not technically understand what is exactly happening within these circuits when they produce these sounds … My question is the following … “ Would you be interested that I personally come to show you the audio results that I have achieved so far with my radios ?” - From my part it would be an honour to meet with you since I am living in The Netherlands… I couldn’t find any other way except here to get in touch with you … Looking forward to hearing from you Thank you Jad

@radiofun232

4 жыл бұрын

mail me op radiofun232 apestaart gmail punt com You tube verwijdert standaard alle emailadressen uit conversaties reacties omwille van veiligheid vandaar dat ik het zo raar heb opgeschreven. groet.

how well would this work to receive the SAQ transmissions in CW from Sweden on 18kHz. Any experiences?

@radiofun232

4 жыл бұрын

No experiences regarding receiving CW from Sweden on 18 KHz. I tested it many years ago with a "window" (raamantenne) antenna between 1 KHz and 25 KHz, but could only (like they told in the 1962 magazine) receive lightning strikes from far away and all kinds of EM "pulses" that I could not interpret. I left it all after experiments during say 3-4 months. But perhaps with a long wire antenna + some adaptation (to tune the wire to 18 KHz, kilometer waves) it will work. Room for experiments!

The J-FET needs a 1 MOhm (or higher) resistor from Gate to Source/ground. Otherwise the Vgs may be not stable.

@radiofun232

4 жыл бұрын

Yes that is a good idea. On the other hand: it will damp the coil.

Dear Master; This is a great circuit. I want to make this circuit. However, I calculated the antenna length for 1khz. It has to be incredibly long. Antenna size is a serious problem. Is there any way to get antenna size?

@radiofun232

3 жыл бұрын

Yes, in a stretched out wire on the field this is very long when you do this calculation. But: that is why you see in all these video's that the coils are made on a ferrite rod (more inductance, quasi magnetic material) or on a frame made of wood via x windings. On/via that frame (or via that ferrite rod) the inductance raises substantially and you don't need an enormous length 1 wire antenna because it is now a coil. You can tune in to (say) 1 KC - 30 KC with the help of a parallel capacitor of 500 PF and more paralleled capacitors. On 1 KC you will surely need to bridge that 500 pF capacitor with caps. values in the 500 PF to 10 N range (perhaps even higher values, watch the videos) to get the circuit tuned to a frequency between 1 KC and (say) 50 KC. You need an oscilloscope and a sine wave generator (0-50 KC or 0-20 KC, schematics are on my YT channel) to test that setup. Couple the generator with a 100 PF capacitor to the circuit/coil to be tested. 27 jan. 2021. By the way: why do you want to receive these low frequencies?

@radiofun232

3 жыл бұрын

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@ahmetozdemir7173

3 жыл бұрын

@@radiofun232 Thank you for the explanations. Your question was as follows; why do you want to receive these low frequencies? Because I want to listen to nature's own voices, except radio. I want to listen to the sounds of natural events such as lightning, thunder or earthquake. Also; In your sentence, there is an expression like this; "..... because it is now a coil." What exactly did you want to tell with this expression, master?

@radiofun232

3 жыл бұрын

@@ahmetozdemir7173 A wire is (in fact, in terms of physics) a coil, but when it is wound the inductance raises.

Wana recived circuit 1.3 mega hertz plzzzz

@radiofun232

4 жыл бұрын

There are many radio circuits on my channel

Detect jet engines? Umm...

@radiofun232

4 жыл бұрын

I found that also very strange, but they told that in the original article of 1962 from "Electronica Wereld" (Dutch magazine).