Trying to make a LW Radio part 7: radio coil filter tested on its peak resonance schematic/demo

Please read the textbox first. This is part 7 of a series of video’s where I tried/try to make a radio to receive Long Wave (normal broadcast) Radio Stations, say the BBC and/or from France. Now this experiment regards a double coil radio bandwidth filter. The test generator that I used in this video (schematic & video) is here https://youtu.be/JpulajXeP0Y

Kind of project. This is video 7 of the series. Second idea in this project was/is to make a (simple) superheterodyne radio for the Long Wave Frequencies. First idea was to make a TRF setup. So doubts about a Superheterodyne setup (?) or a TRF setup (?)

Anyway: a receiver for Long Wave Radio (150 KC-280KC) is the goal.

I wanted to do this experiment by making a 455 KC IF filter myself with a bandwidth of 10 KC. That did not succeed at first sight, anyway. What I made/experimented did not have a 10 KC bandwidth, but a (say) 145 KC bandwidth in the range of 903 KC.

Of course such a filter (schematic and demo in the video) can be used for another purpose: to receive radio stations that have their transmission around the 900 KC radio band, as an antenna coil or antenna filter to press down frequencies lower and higher compared to the peak resonance where this filter works (around 900 KC or somewhat higher or somewhat lower). Much more information is in the video.

Video 1 about this project is here https://youtu.be/gW8hZBa4sbo

Video 2 about this project is here https://youtu.be/flH--5q7zbw
Video 3 is here https://youtu.be/L7-aoGWQdCk
Video about impedance transformation https://youtu.be/vSPQGG4qol8
Video 4 is here https://youtu.be/9XK3nGlFQdk
In that video (4) I stumbled on a very good MW (perhaps even SW) TRF radio setup (schematic & demo are in this video)
Video 5 is here: made a local oscillator for a Superheterodyne radio with a FET transistor
https://youtu.be/9XK3nGlFQdk
Video 6 is here: measurement transmitter on 455 KC (schematic and demo)
https://youtu.be/9XK3nGlFQdk


Please note: some of these video’s are somewhat too long and are surely “side paths” while trying to reach the goal, anyway. And they also show different approaches to reach the goal (= a Long Wave Radio that works good): Superheterodyne or TRF. In a superheterodyne circuit you need a local oscillator.

There are more than 1200 Video’s on my YT channel. I only do analog electronics: audio amplifiers, analog measuring devices, radio circuits, many Shortwave radios, many oscillators HF and audio, other audio & shortwave circuits. Also many (test) generators for all kinds of waveforms, both in the audio range and HF. Also simple “switch” circuits like the Schmitt triggers acting on different input voltages, 555 circuits and circuits of basic electronics issues like “Ohms law”, resistance properties, capacitance properties, the capacitors testing process, electronic “matching” in audio circuits and audio amplifiers, audio pre amplifiers, microphone amplifiers, etc. In all cases you find the schematic inserted in the video.

When you have questions about (certain analog) electronic circuits and how to make them: go to my Channel trailer (Radiofun232 on You Tube) and go to the “looking glass”. Type there the keywords that you want/need like: “power supply”, audio amplifier, capacitor tester, oscillator, radio, shortwave, shortwave radio, or any keyword you like to find the essential info & schematics on my YT channel.

My You Tube channel trailer is here: https://youtu.be/xbgQ8T3oqh4 When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in. My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.


https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=Ko+Tilman
When you search on LULU via my name (Ko Tilman) you can get a better overview. I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that this happens. Upload 28 October 2021.