I'm wiring some electronics (cell phone chargers &c) for use in a hut that has 12/24v power (solar cell + car battery; apparently designed use in caravans...). The plugs inside …

Does anyone have experience with RFID tags? I am wondering, if i have 500 or so tags within the range of my antenna, would it be possible to quickly get an accurate count of how ma …

I would like to know the best resources on the internet for learning the following fundamentals of electronics: basics of electricity, simple DC circuits, and discrete electronic …

I've got a solenoid type thing I want to activate via Arduino. I'm thinking I should isoloate the power to that device via either a relay or MOSFET/CMOS transistor setup. The sole …

Has anyone ever heard of an analog pressure sensor mat that I could interface with a microcontroller? I need something that is very thin that can sense the weight of items that are …

I'm working with an ATMEGA microcontroller in an automotive environment using an external 0-5V eight channel 12-bit ADC, interfacing that via SPI. Those are the largely irrelevant …

hi, i want to start reading electronics science. my aim is reach to the digital electronics, works with micro controllers and design my own circuits and machines. can anyone help …

I have heard that most load on a power grid is inductive. That may be changing with the prevalence of flourescent light bulbs nowadays. My question is, given that the power grid i …

I'm using a TMS320C2812 DSP and want to drive an LED off one of the pins. I'm planning to use a resistor which would result in 10mA being drawn but I don't know if that would be wi …

On one board I have a microcontroller with one power supply and on another I have a Flip Flop with a separate power supply. I want to connect a pin of the microcontroller to the re …

I need to build a transistor circuit to go up from 3.3v (output of serial port) to drive some mechanical relays which require 24v input. Thoughts?

If I wanted to hack an appliance that takes standard outlet power (i.e. I'm in the US so 115VAC) so that I could turn it on and off electronically, (1) would it suffice and (2) wou …

Looking to find out what other electronics enthusiasts/professionals think. What is your favourite solidering iron and why? How much does it cost and where can i get it from?

I'm looking for the cheapest way possible to build a little device that, once connected to a computer via USB, sends an HTTP request to a server. I say cheapest way because I will …

Hey http://kikii.info/pic1.png (Sorry, can not use image tags) Can you please say me what is the red circled thing and what does it do on the circuit ? What is it for ?