• 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. F

    Upgrading antique automotive heater components

    Hello, I hope this isn't too far outside this forum's usual fare. My pride and joy is a 1959 Morris Minor. As you can imagine, it has a pretty simple electrical system composed of mechanical relays and such, and usually I have no trouble working on it. However, I'm homebrewing some upgrades to...
  2. N

    Breath Controller with 3.5mm Jack to make 0 - 5 V Variable voltage (Control Voltage) on 6.5mm Jack

    I am a beginner and wish to tackle this project... I have an old Yamaha breath controller device that has a 3.5mm Jack and requires -9v on the tip (the sleeve is positive). It draws a current of approx 7mA to 20mA depending on how hard you blow it (from what I have managed to research but may...
  3. R

    Variable input/Variable output frequency divider

    Qualifications: I've fixed a few electronic devices, not fixed many more. Never built anything from scratch. Know one component from another, with vague-to-reasonable understanding of them. I need to build a device that converts a variable-frequency 5V/50% duty cycle square wave to the same...

Latest threads

EE World Online Articles