1. C

    Triangular signal cutting off

    I made a circuit to demonstrate the work of a 555 and a constant current regulator and wanted to add triangle wave input. I've done that by integrating the output of a 555 timer, and at the node 'tri' I do get the desired triangle wave of ~ +-8V. Since I want the the voltage positive at all...
  2. S

    Connecting 12V Inductive Sensor to Raspberry Pi 3B+

    Hello, I am not too strong with building electrical circuits so I am just wondering if I could get some feedback on the circuit I built. I am trying to connect a 12V inductive sensor to a Raspberry Pi 3B+ 3.3V port. The inductive sensor is being used to detect a metal sleeve inside of a valve...
  3. brenduan

    Arduino Motor Circuit Only Getting Less Than 1V

    Hello, I have built this motor circuit for my Arduino and when running it only gets less 1v and the motor spins very slowly and my bigger motor doesn't spin at all. I have attached the diagram that I followed below. The Motor should be getting 5v from the Arduino although something seems to be...
  4. Engineer wannabe

    Help with DT Project (includes an inductive charger).

    Hi Everyone, my DT project includes an inductive charger. I would like to build a circuit that when a voltage is received from the inductive charger (9Vdc in ~5Vdc out) one LED blinks then after 10s it remains constant. Then turns off when voltage is stopped. I’m not entirely sure how to go...
  5. Đorđe Jocić

    5V Adapter

    Hello guys, how are you all doing? During the past few months I've been going through the Textbooks AAC has published, experimenting with some minor circuits and even PIC microcontrollers. I've learned a lot during the process and decided to do something a bit more challenging - make a basic...
  6. L

    Casio CDP-100 keyboard piano dead keys - PCB issue?

    Hi all, Newbie to both this forum and electronics! I have a somewhat old Casio CDP-100 with 8 keys that went dead recently. All other keys are fine and speakers/power are working perfectly. Schematics here: http://www.warningwillrobinson.com.au/manuals/Casio%20CDP100%20service%20manual.pdf...
  7. danielzuliani

    Weird issue in toy circuit

    Hi, I'm new in the forum and I don't know much about circuit but I have a problem and would like your insights! I have this toy called B Symphony. Is a great music toy, you can google it and take a look. The point is it got wet and the main circuit suffered some damage. I cleaned it but know I'm...
  8. M

    How do you solve the following dependent circuit problem? I tried to use KVL to get i1, but I got .44, which is the wrong answer.

    Circuit problem: I have the answers to it, but I need to know the process of how to get there.
  9. K

    Looking for help for circuit analysis. Troubleshooting a DBX 1066 compressor/gate/limiter

    Hi everybody! Hope you're good! :) I'm strugglin since some days on that nice muscial tool. I've replaced some faulty switches. Replaced them with new one from Mouser. Sadly I've managed to hurt some VIAS connecting both side of the board. Luckilly enough this is just 2 layer board (top/bottom)...
  10. Lambo Av

    L293N enquiries for Robots with PIC microcontroller

    Hi, all. I have downloaded an L293N motor driver for my Proteus 8 Professional from the following website. https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html Based on the video link in the website (or you can click here: ), it says that the 2 pins (unknown to...
  11. Lambo Av

    Obstacle Avoiding Robot using PIC Microcontroller

    Hi all, I am currently working on this robot with the guidance of the following website "https://circuitdigest.com/microcontroller-projects/obstacle-avoiding-robot-using-pic16f877a" The circuit diagram is as shown below The L293D motor driver module he used looks something like this while...
  12. S

    Vixen DD-2 telescope motor controller not light on LED and not working

    I have a vixen DD-2 telescope controller, which is not working. In my cases the LED on the controller doesn't lighting up. The controller remote is rated 12V/ 0.96A. I have confirmed the capacities of all the capacitors and the voltage at points A to E: A : 12.1V B : 12.1V C : 0.5V D: 0.9V...
  13. AlexVR

    Logism Circuit Design Help. HEX Display

    I need to design a circuit to calculate the product of two 4-bit binary numbers, and then display the decimal result in three HEX displays.I already have the multiplication part, but the hex baffles me since : 1-The inputs are two 4-bit binary numbers. 2-The system can display each input...
  14. csstudent

    Finding voltage source on circuit

    Hello, I've been having difficulty dealting with circuit analysis. Here, for example, I'm given the task to find the voltage on Vs. But I fail short half-way through. Also, I don't understand how to deal with negative voltages and/or currents, and would appreciate help! My attempt at solving...
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