Let's Make Robots!
communicate data to your microcontroller unit via your pc
Hello guys, this is a simple walkthrough that lets you understand how to do BASIC communication between your PC and your MCU (for now it's only from PC to MCU, … Read more

DIY wireless, possible or not?

Hi guys!

Sometime ago i had an idea in my mind about a DIY wireless link between, say, two MCUs. But the point is that i never tested it. I just wanted to know what you thought about it and if you think it could work (you are the electronic gurus after all :) )

It should work like this.

-Receiver has the antenna attached to the base of a darlington, and the signal received goes to the MCU (if not enough maybe i could make a bigger darlington, maybe three NPNs)

Reversed battery protection

Hi guys, i'll start by giving you this circuit:

 circuit2.jpg

The circuit breaker (the PTC at the top named "CB1") and the Zener diode ("D1") have been added for overcurrent and overvoltage protection. But now my concern now is about protection from reversed batteries. What i wanted to ask you is: is it better to add the p-channel mosfet or shall i take it out?

Live and Neutral wires

I don't get it, why are these two different (live and neutral) ? Wouldn't the fact that the electricity alternates make them the same thing?

MOSFET vs BJT

Hi guys. I have to admit i do not know much about these kinds of transistors... i mean, their difference.

I have to get a large current pass through a wire, but after having read articles on wikipedia about mosfet i don't really know why i see them on, say, motor drivers instead of BJT transistors. One thing i don't know about is whether you can find logic-level high-power BJTs but i know there are logic-level FETs, like the IRLD series. But again, if you want to switch a BJT on fully then maybe you could just arrange them into a Darlington i guess.

This is a really nice protoboard i found on Sparkfun. It basically is a standard perfboard, but every single hole is connected to the other ones on it. The cool … Read more

Matching AWGs to Amperes

Hi guys!

i want to make a project in which i drive an IR led with 1A, i was wondering whether i need a specific wire for that, since 1A is not the common 200mA or less i work with. Is there a way to calculate the AWG (or standard diameter in mm) in relation to the current that will pass through it?

One other thing, is it safe to work with 1A (and 7.2V)? what happens if I ground a 1A wire (and 7.2V) through my body? 

Project with 4060 Counter IC

Hi guys!

I can't understand why this project works as the guy states: http://www.kpsec.freeuk.com/projects/xmastree.htm

basically, by what i understood, the 3 columns of LEDs blink at different Hertz, but i don't understand why. Since they are connected to V+ and V0, should they stay firmly switched on? How can connecting a wire in between a column with an output which can be high or low affect this?

Getting the most from an LED

Hi guys. I have recently written the walkthorugh on how to transmit serial data with an IR led and it works fine. Now to the next step: i want to achieve the highest range possible with my LED, without using external aids such as lenses. (that is: only with electronics).

Price: $4.95 USD
Description: Yes you read that correctly - 10Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. … Read more