วีดีโอ

I think it is connected to either the detector output or the output of the first audio amplifier stage. You can tell by the presence of some higher frequency content in the waveform. But it is part of the audio path so close enough.

Thanks for your comment, as for now the combination action is still waiting for the software which got a little bit messy and I am thinking about rewriting it to STM32 instead of Arduino. Physically I have a set of momentary switches that are connected to the same matrix of switches as the stops tabs are. My MIDI board has separate rows for the combination action but columns are still common. MidiTizer offers an option to control action pistons using MIDI commands but I wanted to use another approach. Namely: detect press of any piston, set all tabs to off position, determine which piston was pressed, set appropriate tabs to on position. Of course my 3D printed tabs don’t move on their own so this is only a software trick. Middle piston between generals and combinations is actually to “go back” to the setting that is chosen by the physical tabs. It would be confusing if software allowed the player to modify the ranks using the tabs and pistons at the same time since there is no indication of which tab was turned or disabled by a given piston and which was turned on manually. So my proposed software locks the player to two modes: by hand registration only or combination action only. You enter the combination mode by pressing any piston, the chosen combination is immediately registered, you press the middle piston and the organ goes back to using manual tabs. This approach can be thrown out of the window if your organ uses proper SAMs or you have no tabs at all and just want a combination only set-up. I was aiming for something that looks and feels like a real console on a budget. If you are interested in some code, I have updated the description with the GitHub repository. This repo includes an “unstable” version that I have yet to test which has configuration files and implements combination but is very likely not going to work on the first try. For the switches I have used simple momentary buttons from eBay, on the top of each button I have 3D printed a cap with a number. In the description you can find a link to my Thingiverse profile where I have posted all files including the piston caps. I hope this helps, other info is on my website. Don't hesitate to ask more, I’m glad to hear that more people are building their own organs. Good luck with your project!

The distortion is normal in tube receptors becauae they have a natural distortion

Broadcast is an american term for commercial medium wave, that is band from around 550 to 1600KHz (0,55-1,6MHz). Short wave band is more complicated when it comes to allocations but your typical commercial stations will be in a spread from 7 to 16MHz (short wave total is from 2 to 26MHz) . On those frequencies commercial stations will use AM (amplitude modulation), in which audio is carried by change in signal's amplitiude. FM is frequency modulation but it is commonly used for naming ultra short wave which is your local radio stations at about 98-108MHz. Terms like short wave, medium and long are related to wavelength which is inversly proportional to frequency. Higher frequency->shorter wavelength.

Folks confuse AM and SW and FM. AM is a mode used on the broadcast band. AM is also used ion the SW bands for broadcasting. FM is another mode where the sound modulated the frequency. Using AM (no matter what freq range you are on) the freq stays the same, only the "amplitude' or level of sound to make it simple changes. Broadcast band that uses AM mode, is the usual 550khz, to 1650 khz. Don't confuse modes with frequency coverage bands.

Jestem na elektronice. Tak, przetrwałem sesję :)

Hi, excluding power supply this is all tube based project. Mixer is a ECH81 tube which is triode+heptode. Triode part is being used as an local oscillator (hartley configuration) and heptode is actual rf mixer. Thanks for your comment, i appreciate it.

Tak, mam w planach kilka filmów na temat elektroniki, szczególnie telekomunikacji i radia retro.

Wolf Fajnie

Hi, thank you very much for your response. I knew that there are propaganda stations but never heard one with such a serious warning for us. I agree that Russian authorities are probably ignoring this issue. Hunting down station like this one is very simple, so it gives us to think why they dont do it. Indeed this situation reminds me of nazi Germany propaganda before WWII, espacially the Gleiwitz "incident". Thanks to anyone who is disrupting these illegal broadcasts.

Hi, poor swine-dog, fake man Stanislav Stanislavovich, are you not tired of your provocations against the Russians?

@@SP6GK Thank you for understanding this question.

Sorry i don't read notifications often. On display you can see lp named: ,,Songs i wish i had sung" by Bing Crosby but on turntable i have LP with Ink Spots songs

Wolf: ty!

Thanks.

Oh, and the vacuum tubes are a great touch

After two months of using this case, there is some dust on cpu cooler, but i think it's normal. On mother board and around mobo there's no dust (probably cpu fan draw dust into cpu heatsink). I didn't check it yet but i's sure that in power supply there is much dust. Outside the case there is no dust because i'm cleaning it once at week. I saw your diy case. This backlight window looks amazing! If i were you i would add cover on the front fan. Really nice job.

Thank you very much man, keep up the work!