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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

circuit

  1. ibobibo

    Project using a Credit Card Payment Terminal as a switch device :))

    Hi forum! I'm really new to electronics and would like some advice/ideas about something. I was dumpster-diving a few days ago and found two credit card payment terminal devices, along with some other cool electronics. I thought it would be really fun to install it in my house as for example a...
  2. C

    Mic circuit(Can't make it work).

    Can i make a circuit (like a megaphone) I tried two designs but didn't work The components I used were The mic ,a 0.5 watt speaker ,a BC 547(bc547C V1 E) transistor, a 10k and 100k resistor, a 104 ceramic capacitor and a 3.7v battery.
  3. hesam_m

    DIY 433MHz 4-Channels Wireless Switcher Circuit

    433MHz/315MHz remote controls are everywhere around us, used to control devices such as turning ON/OFF the lights or a TV, or in applications such as opening/closing parking or villa entrance, … etc. Such remotes are available in the market in various shapes and sizes; however, most are equipped...
    • hesam_m
    • Resource
    • 315mhz 433mhz altium designer circuit pcb remote control schematic wireless wireless control
    • Category: Remote Control
  4. Athosworld

    Help with capacitive dropper capacitor value

    I want to make a capacitive dropper and i have a 203 film capacitor that i will use for it. What will be the voltage drop on it. I tried to use an online calculator but it doesn’t work.
  5. K

    Review of electric circuit with Arduino

    Hi guys! I am currently working on a project for which I am in charge of the electronic circuit. However I have never worked with electronics before, therefore I am really desperate and unsure whether what I am doing is correct. If someone could help me out, that would be great! :) So...
  6. hesam_m

    3-Wires/4-Wires FAN Control and Over Temperature Protection using LM35 and ATTiny13

    Proper thermal dissipation is an essential rule for nowadays electronics. The best operating temperature for the electronic components is 25 degrees (standard room temperature). Thermal dissipation in some commercial devices is not done properly which affects the lifetime and performance of the...
    • hesam_m
    • Resource
    • arduino fan circuit cpu fan fan microcontroller pwm fan speed circuit lm35 pcb schematic tiny13
    • Category: Electronic Projects
  7. J

    circuit diagrams for National electric organ SX-3500R bought around1978

    I recently turned on my electric organ after many years of not doing so, and find that the 16' tabs don't work, ie if only the tab is turned on, then the keys don't play any sound. My brother, now 85, used to be an electric organ and tv service/repair man, but had gotten rid of all his service...
  8. hesam_m

    An Ultrasonic Range Finder Using an SRF05 and an ATTiny85

    An ultrasonic range finder is a useful tool in a variety of real-life and robotic applications, such as in obstacle avoidance and distance measurement systems. The ultrasonic range finder measures the distance by emitting a 40KHz pulse of ultrasonic sound that travels through the air until it...
    • hesam_m
    • Resource
    • attiny85 circuit distance measurement pcb range finder srf04 srf05 ultrasonic
    • Category: Electronic Projects
  9. J

    help to do an activity about " half wave rectifier" using the multisim

    the activity primary objtives are: 1. Make a half wave rectifier 2. Check the behavior of the diodes 3. assemble the circuit in the figure 4. Compare the waves over the diode and over the resistor 5. Add the capacitor and observe the waveform at the output of the circuit 6. Draw the waveforms as...
    • julio89
    • Thread
    • circuit eletrical homework help multisim
    • Replies: 3
    • Forum: Homework Help
  10. daniedp76

    Single Led Flasher Circuit.

    need a simple single Led flasher circuit that can operate from a 9v and 12v source. Thanks in advance.
  11. C

    Combinational logic circuit input withdrawal

    How will the output of a combinational logic circuit change once the input is withdrawn? It will definitely change, how will it change?
  12. G

    Design an 8-bit adder block that can add any two 8-bit registers from a bank of 10 registers and store the result again in any one of them.

    Hello, I am engineering student in Turkey. Our teacher gave us a homework. I took care of all but this question. But I couldn't do this question. It is very complicated, I just could not put it in my mind. Can you help me? Thank you
  13. E

    Home-made accumulator charging problem

    Hi guys, I just found old flashlight and due to inability to use any of the new batteries I decided to create new one from 4xAA batteries (NiMH aku AA;1,2V/2000mAh Panasonic "Eneloop"). I created simple circuit and used old flashlight switch in it. It works just fine. Then I added DC charging...
  14. Y

    Need help in creating a next state table from the circuit below!

    Hi Here’s the circuit that I want to find the state diagram for, but before that I need help in creating the next state table for the circuit first. pls help!
  15. T

    Question about technical limitations of 12v relay switches

    Hi, I'm new here, I've just started a project that has me building an electrical circuit for the first time and I don't really know what I'm doing! I'm hoping someone can answer a quick question. I have a 12v electric motor (has two power levels, at 9A and 20A and it was suggested to go with a...
  16. T

    Can anyone help me circuit a Tricorder?

    Hi there! I have 12x 3mm LED's: - 6x flashing - 6x static To this I have a standard slide switch and cell battery holder. My issue is this: how do I link these 14 components to one another and ensure the flashing LEDs stay flashing and the static, static? I believe that a 6V battery will...
  17. T

    PLC communication

    Research the ability of PLC's to communicate via 4-20mA and 0-10volts between the laboratory devices and the PLC This would include how to communicate between these devices using an analog device that has 0-10 volts and converts to 4-20mA.
  18. G

    Need build a circuit that flashes 4x

    Guys, I need some help. I need to build a circuit, that flashes a LED 4 times (only 4x, in a short time, like less than 1/2 second), every time that i click a bottom (click switch). If you can draw me a circuit that may work, I'll be grateful (cuz I'm still learning circuits).
  19. P

    Kirchhoff Voltage Law in a two port network

    In a tutorial about h parameters of a two port network I find the below snippet unable to grasp. According to KVL, the total voltage in a loop is the algebraic sum of the individual voltages. But why in this tutorial ( equation 1 in below image ) it's given so. It should be something like V1 =...
  20. C

    Dependent Current Source

    Hi guys, I'm in an introductory EE class and I was wondering, if the dependent variable of a dependent current source is zero, does the dependent current source become a short circuit or open circuit? Thanks for the help.
  21. C

    Voltage Division Question

    Hi guys, I'm working on a problem here where I believe one of the steps uses voltage division to find the voltage across the 10ohm resistor. However, that's not how the solution found the voltage across the 10ohm resistor. I was trying to find the voltage across the 40ohm resistor first and...
    • cwible
    • Thread
    • circuit dc/ac electronic help help needed voltage voltage divider voltage output
    • Replies: 3
    • Forum: General Electronics Chat
  22. C

    AC Integrator with Square Wave Input

    Hi guys, I am currently working with an AC Integrator and have a square wave as my input while my output is a triangular wave. I am confused why the triangular wave has a decreasing slope when the square wave is at +4V. I believe it has something to do with the area under the square wave...
    • cwible
    • Thread
    • ac integrator ac/dc circuit electric electric circuit electrical electrical engineering integrator square wave trianglewave
    • Replies: 3
    • Forum: Homework Help
  23. electrolives

    Electric Solar Converter

    I want to understand what is the reason for this circuit and each part of it? Can you explain this?
  24. A

    Any available circuit diagrams of good basic walkie talkie licence free India

    Hello all I wanted a basic and good circuit diagram for walkie talkie that can be designed and made into ready use.Have attached image.Thanks all
  25. Clarkdale44

    Relay timer 2 min on and 10 min off, and repeat constantly.

    Hello I want to make an auto relay timer circuit such that it turns on the load connected to the relay for 2 min then turns off for 10 min and repeats this cycle indefinitely. I have a few 555 timer lying around was hoping if could make something out of it. The timings doesn't needs to be...

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