I have not used it yet. But I plan to use it at some point for a VCF module. I even bought a couple already.

This software is not suitable to extract the duty cycle of the input signal. However, if you refer to the previous video on Arduino frequency counters, you will find that the software actually measures the length of both the high and low parts of the input signal. From there, it is easy to calculate the duty cycle. Note, however, that such method has speed limitations that prevent it from measuring signals with high values of frequencies. Here is the link to that video for your cenvenience: kzbin.info/www/bejne/rHWon6R5e7Osq7Msi=dRf-QKhaTbDNdLIF

Got it , thanks.

@anithasshenoy6662 Well, I take you found the answer by yourself. 😊

Just watch the full video. The link is available in the lower part of the short.

Unless some rare cases, it is usually not possible to do so.

@eleneasy Sir, Thanks a lot.

You could add to the 12v power supply a small converter from 12 to 9v made with a LM7809 and use its output to power the Arduino. This way, you would only need one power supply for both devices.

@eleneasy Sir,, Thanks for your help.

It all depends on the kind of necessities. The LM358 is a general purpose op-amp with a good bandwidth that allows for quick response times (high slew rate). When I need a very high input impedance I use a TL072 or TL074, depending on how many op-amps I need. The TLxx op-amps have JFET transistors on the input side, which provide a very high input impedance. They also have a very good slew rate, which makes them as fast as the LM358 in terms of response time. Finally, I use the 5534 when I need a very low noise op-amp. This IC, in fact, although providing a similar slew rate as the TLxx or the LM358, it also provides a very small noise figure, around 3.5nV per square root of the frequency. In rare cases, I also use the LM7332 which works like the LM358 but with a higher output current, around 60 mA.

Not for the bridge rectifier, but for the regulators. When you turn off the power supply, you will have charged capacitors on the right side of the regulators, providing the same voltage as the output. On the left side of the regulators, instead, there is 0V. The regulators will find themselves polarized inversely with possible damage to them. The use of the diodes is suggested by the regulators data sheets to prevent that kind of damage.

@@eleneasy Thanks. I see it now. It's a long time since I did any circuit theory but it's all starting to come back to me now !

😂

I suggest you build directly version 2. It works much better than version 1.

@eleneasy it Is funny that you say this, because after I left this comment I found the video for version 2. I used a slightly modified version of 2 for my mixer and at least in simulation it is working perfectly!

You can use an Arduino due with a host shield. You can receive the midi messages through the usb port on the shield, and send your serial information through the native usb port of the arduino.

@eleneasy thanks a lot, this could be posible with and Arduino uno?

No, it has to be the arduino due. According to my experiments, the host shield does not work well to receive midi messages with the arduino uno.

I hope you enjoy the following parts of this series.

Certainly. The Arduino DUE should be perfect for that. You can use the USB port on the Host shield 2.0 from the video as MIDI input and the native USB of the Arduino DUE as MIDI out. Since the MIDI out work as a device, not as a host, it is possible to use the DUE native port. Also the native port and the port on the shield can be used simultaneously, so one single Arduino DUE and one USB host shield put together can do exactly what you need.

There are several microcontrollers that offer bluetooth capability on board. Here are a few: - Arduino Nano 33 BLE - Arduino Nano 33 IoT - Arduino Uno WiFi Rev2 - Raspberry Pi Pico W - STM32WB - ESP2-S2 If you are familiar with Arduino, go for one of the Nano above. Or you could try with the RPi PICO W, which offers a lot of power with a very affordable price. The other two boards I listed are more costly and less known to the hobbyists. You may find them more difficult to use.

@@eleneasy do these microcontrollers also have analog to digital converters perhaps?

@@praisesogunbanwo Yes, all Arduino boards have several analog to digital converters. The Raspberry Pi Pico has 3 ADC converters.

The device is battery powered. If kept always on with high current capable of doing that damage, the battery would go down in a few minutes. Tested it. So, in general, there is no problem. 😉 The circuit was meant to stay on for short periods of time.

Glad you liked it!

It is actually something I have thought about. I will probably do it sometimes next summer, when I have more time to spare. Thanks for the suggestion anyway. 😊

Thank you for your very good videos👍

I am glad you are interested. This is going to be a challenging project.

Glad it helped you.

Hi Stefan, since I am not totally clear about the scenario you are describing, I will try to answer your question, but that may not necessarily be what you are looking for. If that does not satisfy you, please feel free to repost the question with different wordings. The fact that the electric socket is not purely connected to ground may cause some issues from the perspective of safety, other than electromagnetic shielding. However, if you had a professional electrician installed a real ground connection that you can use, that should help a lot. I am referring of shielding of electronic circuit, for the human body itself, that should not be a problem regardless. As per the electrons passing through your body... well, do not believe that. If there are electrons loose in your bedroom, they will have a very low kinetic energy. The worst they can do is to hit the skin of your body and temporarily ionize a few molecules of the skin cells. At that point they will cease to be free electrons. Your body will later get rid of those electrons as soon as you touch any grounded conductive surface. In order for an electron to actually go though a human body, it would need an enormous amount of energy, the kind that can be given to an electron in a particle accelerator. So, don't worry about that. Even more, assuming that a few electrons would be able to get that amount of energy (I wouldn't know how) and assuming that they would pass through your body, I don't think they would cause any harm. Your body wouldn't even notice. We already leave in a world where we are continuously bombarded by any kind of particle, but they are so few that they do not pose any threat. For particles going through a body to be of any threat you would need a pretty good quantity of them, sort of like standing in the vicinity of a heavily radioactive material. Don't worry too much about protecting your body against electromagnetic fields. Unless your bedroom lies right below a high voltage transmission line, you should not be worried.

@@eleneasy Hello, Thank you so much for your quick reply to my cryptic message. Ok, that is good to know! Kind regards Take care!

Hello, the IC in question should be available on several online vendors, like Amazon, Alibaba, eBay, and so forth. You may find it in several versions that all work the same, for what concerns this circuit. Rather than SN7490AN, try search for SN7490, or SN74H90, or SN74LS90, or SN74HC90, and so forth. It is always the same IC, but the technology is made from, differs depending on the letters at the end or in between, as well as the case type. It is a decade counter, used in this circuit to divide the main frequency by 10, up to 4 times.

@@eleneasy thank you so much!

Glad I could help

Sorry, no. Try again.

@@eleneasy Oh the Theramin ❓

Remember that the arduino circuitry requires a ttl signal at its input. If you use you phone you have to put in between a Schmidt trigger.

@@eleneasy Is this something you have covered in any of your videos? I really don't have a clue 😔any help would be appreciated.

@merkabaenergy9558 Yes, I covered it several times. Go to my KZbin home page and search my videos for schmidt or schmitt and you'll find at least 5 videos on the topic. Look in particular to this video: "Digital Electronics Fundamentals Episode 8: The Schmidt Trigger"

There are libraries to do that very easily. Go to the library manager and search for i2c. You should be able to find something that matches your needs.

For that kind of measurement you need an instrument with a lot of precision. Even 1% precision, at those low values, means to be able to be sensible to 0.01 ohm. Only an expensive instrument can do that, like the one I used in the extended video associated with this short. You can watch it for reference, but we are talking of a lab instrument that, alone, costs easily over 300 dollars.

This was a high frequency transformer. Not suitable for 220v power supply.

It should be possible, but you'll have to modify the software to handle that particular display.

@@eleneasy Is that something you could do 🙏😃

Well, I have a few such modules in stock, and I was already planning to use them in a video to show how to drive them with an Arduino. Stay tuned: you could soon see such a video on my channel.

@@eleneasy ♥♥♥ I will keep my fingers crossed and my eyes peeled 😀

Thanks

That's exactly right, especially if the charge, and therefore the voltage, is high.

Arduino due has usb device functionality, but not usb host.