You are very welcome.

You are very welcome

Given the nature of the three signals, I would use an adder made with an op-amp. The adder could also have the capability of amplifying the mixed signal by acting on the negative feedback resistor that would be posted between the output and the inverting input. You can find an example of this circuit in one of my old videos on op-amps: "Operational Amplifiers Explained". Here is the link: kzbin.info/www/bejne/gn7Qc5qunpidi6c

@@eleneasy Thank you very much for your answer !

The terminal blocks are strips of terminals in a dual row. Each column has two screws, one per row, and they are electrically connected together. Each block can be cut in smaller sizes, if needed. Each block has also a number of holes in the center that can be used to anchor the block using screws. Im my case I used wood screws to attach the blocks to a plate of wood. Here is a link where I bought my terminal blocks: www.amazon.com/dp/B08VND5XDN?ref=ppx_yo2ov_dt_b_product_details&th=1 They have a rating of 380V and 10A max. Hope this helps. This kind of terminal blocks are very common in Europe, but I saw them used also in the States.

@@eleneasy Excellent! Thank you.

Hi "oflittleconsequence". The MIDI 1.0 specification doesn't have a built-in mechanism to directly retrieve the value of a parameter from one device to another. It's designed primarily for sending control messages that trigger actions or set specific values, not for querying information. The only workaround that I can think of to solve your problem, is to store in the controller memory the value of every parameter that has been changed. And this can be done with a separate block of memory for each bank. This way, when you switch bank, rather than retrieving the info from the other MIDI device, you would retrieve the information locally, from the memory block of the controller itself used for that bank.

Thanks for your quick response! Is there some way to poll all the parameters at once, so I can "initialize" the controller by parsing through that dump and reading it all into memory when it is first connected?

Unfortunately, no. The only thing you can do is to store locally a parameter every time you change it. That way, when you move to another bank and then you come back, all the parameters you previously changed are already available in memory. But it is not possible to query the device you are connecting to for reading the parameters already set in there.

Actually the Fresnel lens on the sensor is tall enough to overcome the length of the extension. In other words, the sensor is still capable of sensing infrared light that is behind the extension. Tested, and it works.

I'm so glad!

@@eleneasy I also got a question, It's okay to cascade two second-order circuits (with the same capacitor and resistor values) to achieve a fourth-order filter? or it will impact da quality factor?

@@mirunavlasceanu706 Yes, as long as they are active filters, you can cascade two second order filters to make a fourth order filter. However, the quality factor, or Q, also changes. In particular, if you use two identical second order filters, the new Q factor becomes sqrt(2) times (about 1.41) the original Q factor of each filter. If the two filters are different, then it is necessary to study the transfer function of the newly formed 4th order filter to understand how the Q changes.

Thank you!

Thank you!

I'll see what I can do. Thank you for the feedback.

The cable are just wires. There is no electronics in it. But I will run the experiment to double check.

OK, I just ran another test to see if the presence of the charging cable inserted in the charger makes a difference. As expected it doesn't, since there are no electronics in it. It is just a bunch of wires, actually only two wires, those that convey the voltage coming out of the charger. Anyway, just to clarify, I never said that the charger does not consume any power. I said that I did not measure any. That simply means that the power consumption is so low that cannot even be measured. In other words: the absorbed power, when the charger is plugged in but not in use, is negligible. Of course, if you really want to see it, I can still make a small short to show the test. I will only do it if requested, because it seems to me it won't get much interest and would just ruin my stats.

@@eleneasy Wasn't trying to be combative, just was intrigued. No need to make a video thanks for the response!

That's fine. I can understand. With all these shape and forms of charging cables, it would seem there is some more into them than just wires. But no, companies make them that way to have more proprietary stuff to sell us for a profit. There is nothing special in them. The electronics is all in the actual chargers and in the devices being charged. Several times I opened a broken charging cable to see what's inside and never found anything besides wires variously rearranged, depending on the shape of the connectors.

Take a look at the associated youtube video. The link is available in the short itself, but I'm copying it here just in case. kzbin.info/www/bejne/e5iZaGaoqauJkM0

Extremely mildly. Short amount of time with very small current.

The current involved is very low and the probe is immersed in the solution for just a few seconds, so the oxidation process is very limited. In addition, we are talking about testing solutions that are already poisonous. Nobody would ever think of drinking those liquids. We are talking about high school chemistry. Also, using alternate current would not change much from that perspective. It would only cause oxidation on both wires instead of one, don't you think?

@@eleneasy I think AC would cause less metal deposits, which is why manufacturers invented chipsets just for this. admittedly if I was going to measure the level of water for humans, i'd go with magnets and reed switches or a float/level/magnetic hall sensor. Your diagram works, but it does have the negatives as listed. I built one very very similar (ua741 based) when I was 12, so about 1978.....

@@lezbriddon I agree, there are negatives. But the device is just for didactics purposes and will never be so intensely used to to cause any sensible metal deposits. I had to build the device in a hurry, because my wife needed it almost immediately. Moreover, she needed a number of them, not just one, so I decided to go cheap and build one with minimalistic characteristics. And considering also that she was going to use it to make her students distinguish between ionic and covalent solutions, where only the ionic solutions would have allowed current to flow, and where those solutions where already made with a base of various metals, I didn't worry too much.

Glad you liked it.

Thank you

Hi! I am using Arduino DUE because it has two USB ports, one of which, the so-called native port, I can use in the future to add new features to the MIDI module. The Host USB is provided by the USB Host Shield, not the Arduino DUE. The Arduino DUE does not have this capability, as far as I was able to discover. However, I decided to use the Arduino DUE also for other reasons: its speed (84MHz clock), its big amount of memory, and the availability of several I/O ports, both digital and analog.

Unfortunately not. The native usb port works only as device, not as host, as far as I was able to figure out.

@@eleneasy thank you

We are talking about electromagnetic waves, which do not need a medium to propagate. Such wave can be of three different kid: 1) TEM: Trasverse electromagnetic where both fields are perpendicular to the direction of the motion. 2) TE: electromagnetic waves where only the electric fields in perpendicular to the motion, while the magnetic field is in the same direction. 3) TM: electromagnetic waves where only the magnetic field is perpendicular to the motion and the electric field is in the same direction. You can see how, for electromagnetic waves, it is not possible to have an electromagnetic wave purely longitudinal. Actually, in general, when electromagnetic waves propagate in the open space, they are usually only TEM. It is necessary the interaction with a material to trasform them in TE or TM. For a wave to be purely longitudinal, it has to be a mechanical wave, that uses the mechanical properties of the medium to propagate, like the waves in the ocean, or the sound waves in the air. Electromagnetic waves are not of such nature. Because of the above, the shielding methodologies I have presented in the video, are always valid, for either TEM, TE, or TM wave. For purely TM wave (veru unlikely to happen in the open air), you would have to thicken the shield more then for the TE or TEM waves, but that's about it.

One of the projects in my todo list is a video that explains how to do the calculations for such small toroidal transformers. Stay tuned.

Glad I could help.

Right, but this was part of a longer video demonstrating how to solder smd without any dedicated tool.

The problem is that an electric motor, at the moment you turn it on, absorbs a substantial amount of current, much more than its nominal current value, It is therefore normal that a regular switching power supply, believes that in that moment there is a short circuit. The way to avoid that is to power the motor with a small voltage and increase it slowly up to the nominal voltage. The circuitry for doing that is relatively complicated. To simplify your project, I suggest that you put in between the power supply and the motor a ready made regulator for DC motors. Such regulator allows you to start the motor at a minimum number of RPMs and increase that slowly until you reach the nominal value. I talked about a similar project in an old video. Yoiu may want to take a look at that. Here is the link: kzbin.info/www/bejne/oZqml51tgKdljK8 Hope this helps. Good luck.

Would you please reformulate the question? I'm not sure I understand what you are asking.

Yes, that's definitively another option.

I'm planning to make a video with the details. Stay tuned.

ps its a cbb60 35uf

If you can read the correct capacity on the meter, it should be ok. However, you may also want to check its insulation. It's a little tricky, but you could follow the procedure in the video to ease your mind.

@@eleneasy Ok thank you

The one tha worked for me was the Arduino DUE.

Thanks 🙏🏾 Can I get the data to display on a 1602 lcd from Logic Pro X?

Unfortunately the 1602 is not directly compatible with the arduino due. The arduino due has a logic running at 3.3V, while the 1602 works at 5V. I am currently working on a solution to make the two circuits work together. Stay tuned. A video on that will come out soon.

Thanks I’m trying to build a drum machine midi controller with 8 faders 8 drum pads and a 1602 lcd. I’m trying to figure it out

If that is your intent, probably you can try using the Arduino Mega, or even the Arduino UNO, if it has enough programming memory in it for you. They are both compatible with the 1602. My choice of the Arduino DUE was because it is the only way to use the USB port as Host, as far I was able to figure out. But since you are making a controller, you will use the USB port as a device, not host, so you should be able to use any Arduino that ha a 5V logic and, therefore, compatible with the 1602.

Well, yes, a diode can be used for a particular kind of mixer, then one that multiply signals rather than adding them up. The non-linearity region makes possible the multiplication in a very simple way. I have addressed this subject in the past, when talking about the Theremin mixer. You may want to take a look at those videos. As for the voltage splitter, I have already put it in my todo list. Stay tuned!

@@eleneasy thank you. I will definitly watch the videos.

Well, yes that function generator you see in the video was made by myself way before I started making videos, that's why you couldn't find. If you are interested in buying one at low cost, I see there are several options on Amazon, ranging from about $10 to $100. It all depends on what you want to use it for. This one, for example, is based on the same IC i used for mine, but is very basic: www.amazon.com/ICQUANZX-Precision-Generator-Adjustable-Frequency/dp/B07V674HZY/ref=sr_1_5?crid=WEIEEXDT4N4K&keywords=function+generator&qid=1706289323&sprefix=function+generator%2Caps%2C122&sr=8-5 This other one has a smaller range, but it seems good enough for Audio applications, and It ha a nice display and controls: www.amazon.com/1HZ-500KHZ-Functional-Generator-Seesii-Frequency/dp/B08NSR5GYR/ref=sr_1_3?crid=WEIEEXDT4N4K&keywords=function%2Bgenerator&qid=1706289323&sprefix=function%2Bgenerator%2Caps%2C122&sr=8-3&th=1 Finally, I could suggest an entry level instrument that is also capable of creating any shape you like, a true function generator, rather than a signal generator, but it is around 100 bucks: www.amazon.com/Koolertron-Generator-Precision-Dual-channel-Arbitrary/dp/B07211YWMK/ref=sr_1_4?crid=WEIEEXDT4N4K&keywords=function+generator&qid=1706289323&sprefix=function+generator%2Caps%2C122&sr=8-4&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840 This last one is actually very similar to the one I currently use in my lab.