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  1. Holy Hathaway1

    I’ve got a 4 bladed drone that can run without a controller

    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...
  2. Holy Hathaway1

    How can we replace the relay in a battery charger by one or two MOSFETs?

    My question : how can we replace the relay in a battery charger by one or two MOSFETs? I imagine a P MOSFET mounted as a polarity protection and directly charging the battery through a schottky, and the voltage of the battery sensed by a BJT thru a voltage divider that will block the MOSFET as...
  3. Holy Hathaway1

    I am having huge difficulty with op amp circuit

    I am having huge difficulty with op amp circuit used in TA7642 radios, I cannot figure out how to attach the lm301 chip to have a gain of more than 200 (10 u cap between pin 1 and if I give it too much signal in 50 k ohm pot then the radio just makes a farting noise. My problem is that I need to...
  4. Holy Hathaway1

    One problem about building an electronic level with Arduino

    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.
  5. Holy Hathaway1

    How the sensor fusion works in this case?

    I have one question. Most IMUs now a days have built in sensor fusion using kalman filters. For instance, Mbientlab-MetamotionR IMU. Now i would be getting angular rate from gyroscope. So how the sensor fusion works in this case (built in sensor fusion)? because if i want to get angle of...
  6. Holy Hathaway1

    Questions about replacing the speaker

    Hello, I am wondering if I can replace the speaker with 3.5 mm audio jack and input the audio to my laptops microphone in so I can record the sound using a software such as audacity. I don't know the input specifications and afraid that inputting amplified voltages over 5 volt would damage the...
  7. Holy Hathaway1

    TDA7498 class D amp could be used as a substitute?

    I wonder if TDA7498 class D amp could be used as a substitute for a dead STK power module running at 39 Volt.  If I remember well a class D amp needs the grounds of the output channels to be separated.  One shared output ground, like in a standard amp chassis, may kill the class D amp.  Anybody?
  8. Holy Hathaway1

    My robot shows an error on the left wheel

    Hello, my Irobot 7 shows an error on the left wheel, but the wheel module works because I tested it on another I7, could you explain the full procedures to identify which mosfet is damaged and how to remove it from the board and install the new components reflux? thanks.
  9. Holy Hathaway1

    Program Attiny13a​​​​​​​ With Arduino

    I'm programming ATtiny13A with arduino.  I want to use "stepper.h" library but it seems it is only supported on arduino or atmega series but not on attiny. Is there any way I can fix it? Thank you!
  10. Holy Hathaway1

    Can I replace MPXV7002DP transducer by MPXV7002DPT1?

    thanks mate, really helpful!
  11. Holy Hathaway1

    Can I replace MPXV7002DP transducer by MPXV7002DPT1?

    Can I replace MPXV7002DP transducer by MPXV7002DPT1? Hi all, I bought a MPXV7002DP transducer after reading a detailed introduction article about this device, here's the link: MPXV7002DP. It says that MPXV7002DPT1 is the alternative of MPXV7002DP. But it didn’t give me their comparison about...
  12. Holy Hathaway1

    Relationship between resistance and current 

    How is the current generated? The current is generated because of the positive and negative charges. The electrons are inside the metal conductor and actually flow from the negative electrode to the positive electrode. It can be imagined that there is a positive charge on the positive side of...
  13. Holy Hathaway1

    555 timer

    The 555 timer is a medium-sized integrated circuit developed by Signetics in 1972 to replace mechanical timers. It is named after the input is designed with three 5kΩ resistors. This circuit later became popular in the world. At present, there are four popular products: two BJTs: 555, 556 (with...
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