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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.

  • 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.


  1. 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...
  2. 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...
  3. H

    GPS receivers Front-End Design Problems

    I am designing a GPS L1(PWR=-160dBW) band Direct RF sampling receiver and the front-end: (passive antenna + LNA(21dB) + BGA1(30dB) + jumper + BPF(L1(fc=1575.42MHz,BW=15MHZ) + BGA2 (30dB) + BGA3(30dB) + VGA(-13.5 to +18 Gain Control in 0.5 dB Steps) ). all amplifiers are supplied with a +5 V...
  4. C

    How do I combine separate circuits into one schematic (for project purposes)?

    I started the basics of PCB and doing schematics around 6 weeks ago in my Computer Engineering Drafting and Design class. We used EasyEDA online tool to create the SCH and PCB for our assignments/activities. Our project now is to combine the circuits that we have made before into one system so...
  5. A

    Find a PCB salesperson (Toronto)

    We need a salesperson with PCB sales and customer development experience in North America. We have one-stop production service capabilities for PCB design, manufacturing, SMT, product testing, and product packaging. We have multiple factories and cooperative suppliers.
  6. R

    Noob wants to understand Physical display driver

    So I've some experience with microcontrollers and making PCB's. I've been really interested in making a PCB for a "physical" display driver(saying physical so it will not be confused with a program). But the problem is, I can't find a single tip on working with the display driver components(Not...
  7. Raider36

    Laptop internal sd-card-reader.....possible upgrade/mod ?

    Hi all, I have an MSI GE65 RAIDER 9SF laptop https://uk.msi.com/Laptop/GE65-Raider-9SF/Specification Amazing laptop with 1 x sata 3 + 2 x pcie 3 slots, but all that's letting it down in my opinion is the slow sd card reader. Of course i can use a bulky external sd card device which i have, but...
  8. L

    I'm looking for smallest and cheapest transmiter and receiver for Remote control toys. Can you help me with BOM?

    I'm looking for smallest and cheapest transmiter and receiver for Remote control toys. Can you help me with BOM and circuit diagram? I have gone through some articles which suggests for readymade circuit available on Amazon. But I want to build it without using any readymade circuit.
  9. S

    Help In Identifying Power Transformer Replacement

    Hi All! Never done a forum post before but I thought I'd give it a shot to see if anyone out there had any insight into an issue I'm running into on a repair I'm doing! QUESTION: I need help in identifying what the specifications are on this power transformer (pictures below!). It appears...
  10. R

    Short-Circuit Protection for 3-6 Volts AA Batteries

    I’m looking for a circuit that can protect 3-6 Volts AA Batteries when a short-circuit happens. When the short-circuit happens, a second circuit (LED blinking) must be triggered and the batteries must be protected. The goal is that the LED won’t stop blinking until the short-circuit is undone...
  11. I

    can someone name this component?

    I am trying to find this component but I dont know the name of it. 4 conductor connector search showed me other types of connectors. Thanks
  12. D

    How to Make DIY Home Automation System Using Wemos D1

    How to Make DIY Home Automation System Using Wemos D1 A simple home automation project allows you to control home appliance from anywhere. Blynk provides very good and attractive interface. Story Video Video In this project we are going to build simple home automation system in which we can...
  13. O

    RF 50 Ohms Dummy Load PCB Design (High Frequency Ground Plane)

    Hi I am a rookie on both RF and PCB design and I am currently trying to do a 50 Ohm 11 Watts Dummy Load project for 100MHz-1GHz. My calculations are done for the load but I have some questions about designing the PCB. I am trying to do it as a microstrip line and as a simple structure of the...
  14. S

    Digital Pregnancy/Drug/Diagnostic test

    Hi All I work for a medical diagnostic company which develops drug/malaria/HIV/etc diagnostic tests. I have been tasked with the role of learning and developing a digital display to mitigate human error when reading the results. I was guided to look at the ClearBlue pregnancy test (with LCD...
  15. D

    Missing datasheet from the new motordriver JYQD_7V.3E3 24V

    Has someone the new datasheet from the JYQD_7V.3E3 motordriver 24V (that one with the hall sensor pads on the side)? I can't find the new version or this one where the hall sensor pads aren't aligned...
  16. Z


    Hello, I was thinking to try and do my own PCB layouts myself, and then generate the gerber files so I can give them to my PCB manufacturer. But I never used such a software and I would like to ask this forum which one I should use? It should allow me to design layouts from the smallest. To...
  17. jamesbulini

    What do you think about this 3D model of PCB?

    Thanks for everyone help me.;);););) Now my new project 3D model is done. I build it with my teacher, and this project takes me a month to do it. Hooo! Feel free to leave a comment. :angelic::angelic::angelic::angelic::angelic::angelic:
  18. jamesbulini

    HI,i wanna know what is the impedance board?

    What are the difference between impedance board & Non-impedance board? :confused::confused::confused::confused:
  19. jamesbulini

    How to draw a drill hole on the PCB board?The problem is weak. Please don't laugh.

    I am a rookie, just started to learn PCB drawing, using Altium Designer 13. I had a problem: I had to drill a hole in my board, just a physical hole, without electrical properties, not the kind of pad. At first, because I didn't understand, so. 1. I drew a circle on the schematic Drill Drawing...
  20. jamesbulini

    PCB design The problem of wiring line width on the pad, can it be different?

    As you can see, the thickness of the power line, blue line and red line on the circular pad is different. Is this feasible? The line to the left of the right square pad and the line above it are also different in thickness. Is this OK? I heard that this situation will reflect under high...
  21. Gabriel Sá Pinto

    Methods of inducing short circuits

    Hello everyone, I'm here with a dilemma regarding a company project. We have a developed software defined radio with 2 separate boards ( one for data, one for power) shielded by a metal case (top, bottom and between boards). We're on a milestone that requires us to develop test procedures for...
  22. 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
  23. G

    Charred traces on PCB or carbon coating?

    Hello everyone. We have a especialized PCB here (multipoint control unit, videoconference), and it showed us some alerts of overheating. Opening it up, we found some "carbonized" traces, showed in the pics below. Our doubt is, is it sign of overheating or is it come coating or insulation...
  24. S

    A review for PCB prototype made by ALLPCB

    Hi, this is Sergey, I got my new PCBs in hands this Tuesday by ALLPCB on this Tuesday. Here share a review for it. [I don't have any commision or coupons from them, just shared my really purchase experience.] I order on July 5, and it amazing shipped July 6. Finished only 1 day. and shipped...

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