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I’ve got a 4 bladed drone that can run without a controller 2. Once in the air it’s programmed to follow you via a tracker beacon and the on board sensors or an automatic computer program. Although it comes with one anyway so you can do tricks and more complex moves, but other than that it’s fully automatic and requires no assistance. I use it for film and checking stuff on my farm.

I want to build an electronic level with MPU-6050 and Arduino. I have one of my MPU-6050’s mounted on a breadboard and started the example in the library but the numbers are drifting quiet a lot with the non-moving module? Today i maybe try it with an other MPU-6050.

Hello, I want to hook up a MPL3115A2 pressure transducer sensor and interface it with an Arduino micro-controller. But I have a question. I could set up the display and I can see it is working. The problem is that I get some random numbers, regardless of connecting the sensor or disconnecting the Arduino analog input from it. What might be the problem? Even when nothing is connected to the A0 or any other analog pin, I see the same behaviour. I appreciate any reply and help.

Can TTP223 switch be used in place of a mosfet to switch on and off a simple circuit, with the only other components being an led and a power source (and possibly a resister)? I hope to make a tiny light source to place inside a matchbox/hot wheels car that I can activate/deactivate by just touching the surface of the car.

I'm trying to use 28BYJ-48 stepper motor with ULN2003 driver Arduino, i.e. move an object in one direction for a short time and then reverse it and then do a repeat while the power in still on. I have made lots of stuff (electronic clocks mainly) but this the first time I have used an arduino controlled motor. I do have a question.Normally I solder my connections but with the UNO board that does not seem to be necessary. Is that correct?

If I have the previledge to buy a cheaper 3000mhz ram over a more expensive 2666mhz(the fastest speed of cpu support) both same size 16gb, will it work if i downclock it to 2666mhz through bios? Or will i have issues?

Hello, I wanted to use STM32 in my projects but I haven't found a great beginner's guide. Do you have some recommendations？ Thank you.

Hello all, I 'm testing TDA7498 100 watt class D amplifier. I had a question that relates to Class D. I'm thinking about buying a Class D solid state guitar amplifier, but I heard that Class D amps lose a lot of their power (more than Class A or A/B amps do) when they drive speakers above 4 ohms, and my speaker happens to be 8 ohms. Is this so? If it is, the high watts the amp manufacturer claims for the amp don't seem as impressive.

I was going to use an AD623 instrumentation amplifier for my final project. In proteus simulation i get the values that i want but in application, i got way more different output voltages from instrumentation amplifier. So anyone has an explanation for that situation?

I bought a LM3900 Op-amp after reading a detailed introduction article about this device, here's the link: LM3900 datasheet. It gives me their comparison about specifications. But I found that the only difference between them is output current. So I have a question: can these two be used interchangeably even their output current is different? I’m not the expert at Op-amp, any help will be appreciated.

The following information of MAN6760 is available online, but I can't find Series Package Dimensions. The pictures I see are not clear. Any help will be appreciated.

As far as I learned, the rule of thumb for the ratio of output impdance to load(input impedance)is 1 to 10. Thevenin resistance(output resistance) Rth should be very small compred to the load resistance Rload. Rth/Rload must be small in order to avoid “loading the circuit”. A maximum ratio of 1/10 is often used as a design rule of thumb. I was trying to understand how this would result in RC circuits. I came across to the following link which is part of a text book where it explains rule of thumb in RC case (see page 19): Basically the text says: Since impedance of an RC circuit is: Z = Xc // R = [R * (-j/(w * C))] / [R + (-j/(w * C))] we have a frequency dependent impedance here and we should apply the worst case scenario. To make my question clear I add the following circuit: In above circuit filter A is driving filter B. Considering the circuit, here is what I understand from his arguments on input and output impedance: 1-) We want ideally Zout (in filter A) to be as low as possible. That means in worst case Zout will be high which happens when frequency is very low. And he approximates filter A to R here. 2-) We want ideally Zin to be as high as possible. That means in worst case Zin will be very low which happens when frequency is very high. This approximates Filter B to R. I can see that from the Z = Xc // R relation. I can picture this in my mind when I think with "phasor representation". If the frequency goes too high, Xc goes to zero and Z becomes R. This looks more straightforward. My question is about the first argument above. I will repeat again: Lets consider Filter A again in above circuit. We want ideally Zout to be as low as possible because we don't want loading. That means in worst case Zout will be too high which happens when frequency is very low. But when I think with phasor representation. If the frequency is set to too low, Xc goes to infinity and Zout doesn't become R. Where am I wrong here?

I built the circuit below on my breadboard. I've checked every connection and it doesn't work. The thing I didn't know how to do was connecting the output (a LED) and the input. (a button) I did something pretty random and, no surprise, it doesn't work. My question is how do I connect the input and output and can I do it with a button and a LED? Also, I've used 3.3k resistors instead of 3.9k resistors. Is that bad? Reference: the multivibrator was bought from http://www.kynix.com/Detail/1165415/HC4538.html