electronic circuit

  1. E

    Turn on the Common Cathode Seven Segment using PNP transistor

    I am using seven segment in my project and i was using common cathode and using npn transistor i was able to switch by making arduino pin HIGH. But now i want to display the data on seven segment when i make the pin as LOW. I mean i want to select the Segment when i will make it LOW. i was...
  2. ecaits

    Op amp used in cyclic voltammetry application

    In cyclic voltammetry application (as per circuit design given in image), the voltage difference between reference electrode (RE) and working electrode (WE) will be constant. As per REDOX process (Reduction & Oxidation), the current will flow between counter and working electrode. The circuit...
  3. R

    Tesla Coil Not Working. Transistor Getting Extremely Hot

    Tesla Coil Not Working. Transistor Getting Extremely Hot. See The image Below. I Did not use a switch and i did not use an led
  4. E

    Controller gets hang on Relay switching

    I am using a relay to turn ON/OFF the AC load. But when i turn ON and turn OFF the AC load (230 VAC) 3-4 times my controller gets hang. Here is my circuit diagram for the relay. The ground is common in all over schematic. What changes do I need to do for improving the noise?
  5. E

    DC current sense using Opamp

    I want to measure a current consumption for DC fan. I am using OPA2197 opamp for the same. Following is the circuit diagram. i want to understand if this circuit missing anything?
  6. Answerz

    PsOC 4 BLE (pins problems)

    I am running a project using a thermistor. I started by using the evaluation board as shown: The program runs fine. After that, I removed the module from the evaluation board and powered the module using an external power source (3V). I moved the resistor and thermistor from the evaluation...
  7. A

    detect pressure of the arm coming together

    hi I am developing simple circuit where I am trying to detect pressure when arms coming together when hand bended. the device will be placed near the L bow of hand and when user bend the arm, the device measure the pressure and beep if pressure is higher than set limit. I know micro controller...
  8. Lambo Av

    Doubts on How Connector Works

    Hi all, I am currently reviewing this Degson DG2002-4.0 connector. https://www.degson.com/content/details_123_10715.html May I know what does the arrow above the connector mean? And what do the holes beside the arrow does? Based on the photo below, there is this operating tool which can be...
  9. D

    Non-Inverting Amplifier (AC Coupled) : How to solve this circuit with lower and high frequency?

    I need to design this circuit with a gain of 26 for signals where the frequency varies from 800Hz to 8kHz and I also need to find out the current on the RL load. (VA = 100mV) Will C1 behave like an open circuit in ac analysis? I am getting to lower the frequency (800Hz) but I am not able to...
  10. D

    Electronic circuit for a dispenser

    Hi, I would like to request help from anyone who can help. I am currently doing a project which is creating a simple dispenser. This dispenser requires a programmable timer which when activated will cause a motor to rotate a piece of acrylic for about 0.75-1sec to release sand granules. The...
  11. A

    I really can't find a solution for this, need to find how many Ohms is the resistor

    Okay so I have a project due tomorrow and I can't get it right, I need to find how many Ohms is the resistor Rb, the link is a screenshot to the task UBX is Uin. https://prnt.sc/t92gbh
  12. Sahilp

    Question,help with sinusoidal voltage

    A sinusoidal voltage has a value of 80 V at 2.4 ms and it takes time of 20 ms to complete one cycle. Determine the maximum value and time to reach it for the first time after zero
  13. H

    Why this Simple Watt Meter for 220 Volt Circuit works?

    Hello! I'm just a begginer student. I found this circuit of a wattmeter that works only with resistors. Can someone explain to me how the 33k resistor give a voltage of 1 mV to 1 Watt? I did not understand why these resistor values has been chosen and why the it measures only in the 33k...
  14. M

    OP amp question. Calculate the gain vi/vo.

    Hi I'm currently stuck on current question. Consider the following OP amp circuit in . Obtain the gain vo/vi of the amplifier. What I can see is I can find the voltage on positive and negative pin of top OP amp, which is 30/50*vi (because positive pin of top OP amp is in parallel with 30...
  15. Shiroha001

    How to connect these two circuits into one?

    Thank you
  16. Benzine

    How to add an USB hub to an existing circuit ?

    Hi everyone, I was looking for answers on google and stumbled upon this forum so I figured I might aswell directly ask my questions here =) I'm trying to mod a Guitar Hero controller (RedOctane Xplorer for Xbox 360) and part of what I wanted to do was adding a usb HUB inside the controller to...
  17. G

    Project Ideas

    Hello! I am a computer science and AI student, but I am getting into hardware. Over the last few weeks, I have become rather adept at designing circuits and PCBs (I might have audited a couple of courses but that doesn't matter... right?). I have designed my own version of a maker board --...
  18. 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...
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