Noisy Sine Waves - Penny Organ Project

[@alancordwell9759]

That waveform, and the key click, gives it a rather Hammond-like quality!

[@lucasc5622]

penny organ v2 will have bass pedals and a leslie speaker

[@Bob3519]

This and the vocoder project are very neat. Following these has been very interesting. Thanks again for sharing these projects.

[@azyfloof]

Try a capacitor in series with the output of each oscillator, Jules. It should prevent any DC offset on the output, passing through only the sinewave. Also see if there's a way to make the oscillators "zero crossing" That's the term to look out for. Looking forward to the debut album! :D :D

[@jellyfishjelly1941]

or make arduino watch for the zero crossin

[@zippy7262]

Hi Julian, I love the penny organ - good to see it back! Best wishes

[@TheDutyPaid]

I was hoping this would come back, remembered I asked about it in the live steam.

[@JulianIlett]

I think it was you that reminded me :)

[@TheDutyPaid]

Also, have you and connected your website with KZbin? You should be verified by now but not linking your site may be holding you back.

[@akarshagarwal4516]

I saw your oscilloscope first time today since I'm following :)

[@kipcrossing]

Put in an option for a triangle wave.

[@Arnthorg]

you could also use a low pass filter to filter out the harmonics

[@fastlingo]

I made a thing like this some years back, only mine had 24 tone creators lol with envelope and also with wave modifier so it started with a lot of harmonics (jagged waves) and ended up with a smooth sine, just like a string being pinched would

[@MrZombiekiller7777]

How about adding a low pass filter to filter out the oscilation on the top of the sine wave?

[@68MalKontent]

Why not put 4 capacitors in the mixer to get rid of the clicks?

[@hamandwine]

Good one again! I guess the continuous offset on the outputs will probably give you some headache later in the vocoder. So I really suggest to add a bipolar electrolytic capacitor in series of each output to the summing point, or later to the inputs of the vocoder. For the noisy module, check for a broken chip capacitor. May be just put a normal legged one across some of them to check which one is broken.

[@flagpoleeip]

Who'd have thought that decking would have been useful in so many projects.

[@p1nesap]

how about a DIY synth from one of those vintage ICs?

[@JulianIlett]

Those old ICs are so expensive now :(

[@danielroibert5631]

Hello, verry amazing :-) is-it possible to have the references for where to buy the vco ?

[@danielskevington8940]

You'll probably need to use the triangle or square waveshape as an input for a vocoder, you want something with as much harmonic content as possible so that there is some signal in any given band of the carrier where there is energy present in the modulator. Using sine waves only will give quite limited articulation.

[@JulianIlett]

True, although the vocoder can inject white noise into the mix when it detects ss, sh and ch sounds from the microphone.

[@yoianrhodes]

+Julian Ilett how does it know to add it?

[@rubusroo68]

that was all kinds of awesome, thanks!!!

[@CezaryAkakios]

The scaggly waveform kind of looks like what happens if you have an op-amp that isn't rail-to-rail capable and you try to drive one side of it too far towards the rails. Maybe the positive rail of the oscillator is too low for some reason. Or maybe there's an offset that's shifting the entire waveform up and causing it to run too close to the rail.

[@kennedy67951]

Julian, how about doing some reviews on handheld meters. ESR, LCR and any other meters for a very small shop. You know the ones that are very cheap. Do your best to let people know what they can expect when buying one. Also, can you build larger circuits like say a very low 6v to 24v input pure sinewave inverter with a high output 120v to 220v? Just a thought. Have a great day.

[@Klonkiller361]

What about trying to connect a small Inductor in Series with the first DSO?

[@microwar]

Norwegian Krone on the left? Got the answer at the end of the video. How did you get them ?

[@techy4198]

When classing an octave as 12 notes it doesn't count the duplicated start/end note! From C to C is 13! So you'll either have to make do with a missing note or buy a touch sensor with more than 12 inputs!

[@CykasAppleTV]

Thanks Julian, good one. Can you share the code somewhere?

[@Ogma3bandcamp]

Excellent to watch the progresson of this project and eventually to see it in conjunction with the vocoder. You will need more than 4 bronze coins for the semitones, 6 or 7, I think.

[@M0UAW_IO83]

Are you using the sleep function to mute the output or clearing the tuning word register? Sleep function can leave the last programmed level outputted so that'd explain why you get a DC level. Also worth checking the filter components on the boards as they have been known to be *very* incorrect or even missing.

[@JulianIlett]

I'm clearing the tuning word register. This module doesn't have any filter components. I do have one with the filter, but I think it's tuned to the highest frequencies (around 40MHz) so it won't have much effect at audio frequencies.

[@M0UAW_IO83]

Then I think it needs to be put into reset by setting that bit which according to the datasheet will output 'mid range' and should carry on with the previous configuration when you clear it (which seems odd but...) As none of the synth modules have the filter and only one is affected, it's probably a faulty module but still worth looking at the decoupling caps on board.

[@JulianIlett]

Yeah, I'll do that. I'm going to pull that DCO out and use it to generate square wave frequencies for testing the Frequency counter kit I've just built. I can have a closer look at it then. Cheers Clint :)

[@Coolkeys2009]

You can even get clicks on professional keyboard/synthesizers if the attack and release times etc are very short, once you build an envelope generator the issue will be mostly solved. You will need to make sure AC coupling is used in the appropriate places to prevent issues in any case, maybe be you can fix part of the problem in software.

[@MattOGormanSmith]

I suspect the envelope will be controlled by the vocoder :) edit:: pressed enter just as he said the word WF;CL!

[@jesuishalil]

MattOGormanSmith what is wf;cl?

[@Coolkeys2009]

I'm going for watch first, comment later :-)

[@jesuishalil]

Excellent,that has to be it,thanks coolkeys!

[@MattOGormanSmith]

I didn't want to spoil the meme by explaining :)

[@proluxelectronics7419]

May be worth looking into a optional MIDI input.

[@jayherde0]

I'm thinking you are going to need 5 more coins ... You've got the 8 White keys (one of which is an octave). The Black keys (in 'flats') will be B, E, A, D and G. I must say, you've got a good ear!!

[@JerryEricsson]

Perhaps you could build a filter to cut out the bad frequency? Just a thought, it would make a great tutorial on building filters. May end up making one of those just for fun one day.

[@Roy_Tellason]

It's not apparent from what I can see in the video whether there are any power supply bypass capacitors in there, If I were building something like this I would have at least 100nF on each of the oscillator modules and also some smaller caps (100-470pF?) on the signal outputs. If you look at a schematic of a lot of electronic musical instruments you find that there are bypass caps all over the place. Needed, I think.

[@pvc988]

I am just guessing, but this "distortion" looks like typical symptom of too low capacitance (or resistance) on PWM output. If these chips indeed have PWM outputs then check the output cap.

[@OzmoMac]

are you going to fix it by your self or are you going to buy one. I think that would make for a good project if you fixed it.

[@JulianIlett]

Either or. I'll lift it out of the penny organ and have a closer look.

[@jeffmerlin2580]

Thanks, Julian! Another great video. Probably a slip of tongue at 11:34 (or you may have calculated 12-8=4). It's 5 black keys of course. You get 13 keys (two C-keys).

[@JulianIlett]

Yes, I only realised once I'd started editing :/

[@williamsquires3070]

I can see this as a foundation on which to build a (simple) OCR/music player. Add one more digital oscillator, and replace the 8 coins with 8 reflective-mode opto-couplers, a stepper motor, and some specially prepared "sheet music", and the four buttons on the left as stop/start, rec/play, FF and rewind. Make a simple conveyer belt driven by the stepper motor to pull the strip of sheet music under the reader head (the opto-couplers), and have the arduino read them and send the info to a PC, or to internal memory, while playing the notes as you already have. Voila - Arduino-controlled player piano! :)

[@paulsengupta971]

That would be excellent! But it doesn't have to be one or the other, you could keep the existing setup and couple in a board on the side which does the optical bits, just wired up in parallel with the touch recognition thing.

[@makerKID5]

This is so AWESOME! Rugrats theme song 12:30

[@nicktohzyu]

what about implementing the chord buttons with non-equal temperament?

[@JulianIlett]

That's something I do want to try :)

[@JJayzX]

the first oscillator seemed to have a ripple in it even when it wasn't in use vs the other that seemed to stay flat and not roll.

[@FuzzyMannerz]

Save me a Krispy Kreme! ;)

[@FindLiberty]

Congratulations Fuzzy, you have spotted the dangerous heart-stopping safety problem that appeared in this video. Sitting around and playing with low voltage DC with one hand while munching doughnuts using the other hand is not a very healthy lifestyle! (lol Mmmm, and for variety, nine seconds or so in the microwave and they are warm, fork-ready to eat!) After eating two or three doughnuts along with a glass of nice cold milk, you can resume working with the Arduino, before this stuff kills you.

[@MrBrymstond]

What if you press two notes at the same time?

[@DAVIDGREGORYKERR]

what about a DSP Comb Filter might solve the problem.

[@drmr_music]

You could stick to the Japanese currency theme and use 5 Yen coins for the black note keys, they are copper/zinc and come with holes, too.

[@amanmittal4232]

nice video as always...julian u should try air conditionar jacket as this is a new concept and a few channels shown how to made them..think about it

[@JulianIlett]

Ha ha, this is England - air conditioning rarely needed.

[@amanmittal4232]

Julian Ilett 😂😂😂😂

[@Meneltour27]

whould a pass filter help ? something that doesnt let 20khz and up pass. even better 30khz just to be sure all the ppl hear all the spectrum

[@jlucasound]

Where are the sharps/flats?! :-)

[@andymouse]

you clearly play, may ask what sir ?

[@JulianIlett]

A few things, badly :)

[@andymouse]

I bet you have had a go with a "Theremin" :)

[@mbirth]

Bronze coins with holes: 25 Pesetas coins!

[@lb5sh]

1 krone represent!

[@joinedupjon]

well I could hear the attack click... but the different DCOs all sounded just the same to me :( guess I'm not very musical

[@LiyangHU]

So you'll be after some ¥5 coins then…?

[@robehickmann]

Try playing atholl highlanders, 4 part 6/8 march. only one octave.

[@AstAMoore]

More like a yuan organ. (Or is it a Chinese knock-off?) Or are these yens? Oh, yeah, they look like 50-yen coins. Good. Japanese synths are among the best.

[@scarholmen]

Higher c doesn't count, so you need another 5 coins.

[@JulianIlett]

Ah yes, you're right - there are 5 black keys

[@oldblokeh]

... and those would be C#/Db, D#/Eb, F#/Gb, G#/Ab and A#/Bb, to save you looking at a piano ;)

[@LemoUtan]

Diatonic (UNION) Pentatonic = Chromatic!

[@mrgreenjeans9839]

👍👍👍✌️👽👀

[@SidneyCritic]

Where's the fun in not fixing the osc. Dying to know.

[@JulianIlett]

I will look more closely at it - then connect it to the frequency meter.

[@paulsengupta971]

Actually, having the harmonics/distortion in the 4th position sounds quite nice.

[@jgallantmusic]

aye old sqauff

[@ThatGuy-nv2wo]

1:10 FIFO!