I am wanting to design a circuit that uses an astable multivibrator as a clock source. However the difference being that over time the clock is gradually sped up until it reaches s …

Hi all. We are to create an 8051 microcontroller based system as a university project. We have the specs, which says we need an Atmel 89C51 chip. But Atmel recommends that we use …

I'm looking around for a large LCD character display (metre-ish long, 10-15cm high), and on the cheap side (of course) Any suggestions? Actually I think I meant LED display, max …

How does one go about building an interface for a USB device that allows interfacing pots, linear/log tapers, and momentary/toggle switches to a computer? If someone could give me …

What is the best way to protect code flashed onto any AVR based device from reverse engineering? What is an easy way to provide updates to end users to flash on their own without …

Hey folks, I'm working on a device using arm-elf-gcc to compile code for a MakingThings prototype board. My development machine is a Linux box running Ubuntu 9.10. On a different …

I have a hall effect sensor which outputs 0V when on the North pole of a magnet, 5V when on the South pole. It idles at 2.5V. I want to connect 2 LEDs to show the reading, one act …

I'm after a wireless PIR sensor for outdoor security use. The PIR sensor should communicate via RF to a receiver which has a TTL output. I'd like to eventually connect this outpu …

I do a fair bit of soldering (lead-free). Is breathing in solder/flux/paste fumes actually going to harm me? Are cheap fume extractors worth buying?

For example when you build a circuit you have the board and the components between them is air. Is there a clay like material that will act like air does? Application: you could …

I'm a bit confused between the microprogramming level vs machine language level. For example: Where do both types of programs reside while being executed? Do either have a 1:1 m …

Hi, I inherited a Weller WTCPL soldering station a while ago: Picture of iron It was my grandpa's, and although I can't find a direct reference to it anywhere on the net, I'm gue …

Are there any low-cost (<50$USD) wireless ambient temperature sensors available? I would like a simple to interface to the sensor i.e. IP over Wifi if at all possible.

I've been milling over the different options for sourcing professionally manufactured PCBs. I've just started a business and I'm looking to make a few electronic kits, for now were …

I'd like to make a single board computer capable of booting Linux, with my low-tech garage tools (2 sided PCBs, reflow skillet, no plating through holes). What's the simplest hard …