## How Does it work?

The easiest way to regulate the speed of an electric motor, is to decrease / increase the supplied voltage. This can be done by putting an adjustable serial resistor in series with the motor. https://web.archive.org/web/20081222213911/http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-2757683140936137&dt=1230067431898&lmt=1612436424&output=html&slotname=6542966663&correlator=1230067431898&url=https%3A%2F%2Fmayothi.com%2Fspeedcontrol2.html&eid=6083027&ea=0&frm=0&ga_vid=1883978985.1230067435&ga_sid=1230067435&ga_hid=726046104&flash=0&u_h=864&u_w=1536&u_ah=834&u_aw=1536&u_cd=24&u_his=11&u_nplug=3&u_nmime=4&dtd=M This is exactly how my first ‘Scalectric’ speed control worked. It had a high-resistance wire wrapped around a core and …

## Build a speed control for radio control models!

We will show you how to build a speed control for only a fraction of the cost of those available commercially. This speed control uses a low-cost Pic12F675 micro controller and a few other basic components (resistors, capacitors, transistors, diodes and a regulator.) Below is a photo of the speed control connected to the motor …

## Diode Tutorial

Diodes have the following properties: They only allow current to flow in one direction They have a specific voltage drop, which can be taken as a constant for most circuits https://web.archive.org/web/20090224113643/http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-2757683140936137&dt=1235387152210&lmt=1612436233&output=html&slotname=6542966663&correlator=1235387152210&url=https%3A%2F%2Fmayothi.com%2Fdiodes.html&frm=0&ga_vid=861307647.1235387153&ga_sid=1235387153&ga_hid=918268353&flash=0&u_h=864&u_w=1536&u_ah=834&u_aw=1536&u_cd=24&u_his=8&u_nplug=3&u_nmime=4&dtd=M&w=728&h=90&xpc=uGwQh3BKCc&p=https%3A//web.archive.org A diode is represented with the following symbol: The diode above will pass current flowing from left to right, but block current trying to …

I like the simplicity of my VW Polo’s standard radio unit, but I really need a bluetooth handsfree kit and iPod connectivity. I first tried an after-market kit that added the needed functionality to the factory radio, but after returning it for the third time (each time waiting more than a month for the replacement …

## Resistor Tutorial

A basic circuit Here is an example of using Ohm’s Law for a basic circuit (see the electronics introduction if you’re not familiar with Ohm’s law.) We have a resistor of 4k7 (4700 Ohm) connected to a 5V supply, what is the current flowing through it? https://web.archive.org/web/20090224113643/http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-2757683140936137&dt=1235427218282&lmt=1612436182&output=html&slotname=6542966663&correlator=1235427218282&url=https%3A%2F%2Fmayothi.com%2Fresistors.html&frm=0&ga_vid=2137999440.1235427220&ga_sid=1235427220&ga_hid=1237380667&flash=0&u_h=864&u_w=1536&u_ah=834&u_aw=1536&u_cd=24&u_his=7&u_nplug=3&u_nmime=4&dtd=M&w=728&h=90&xpc=BvwG0wKY6e&p=https%3A//web.archive.org Answer I = V/R = 5V/4k7 = 1.06mA …

## Electronics Introduction

Ohm’s Law Probably the most important law in electronics is Ohm’s Law. Ohms Law states that the voltage across a resistor equals the resistance of the resistor times the current flowing through it (V=R*I). Thus if you have a resistance of 1000 ohms and a current of 10 milliamps flowing through it, the voltage over …

## SerialWizz

I’ve never really liked Hyper Terminal (the communications program bundled with windows) when it comes to serial communications. Thus I decided to write something specifically for programmers / engineers to make serial communications easy. What I like about serialWizz: No need to create a new connection every time you open the program All the settings …

## How Knoughty works

Background :Knoughty was written as a simple demonstration of the alpha-beta search algorithm. Because noughts and crosses is a simple game, a perfect alpha-beta search is possible and can also be done very quickly (on my Palm Zire 72, it only takes a fraction of a second to make each move.) I have written the program …

## Boolean Algebra

Number systems We humans (and selected Alien species) use the decimal number system. What this means is that all the numbers we write down consists of the 10 digits 0 to 9. In other words when we count and get to 9, we start again with 0. Of course to show the difference between zero …

## Chess

This page is dedicated to contributions from other users. To use one of these boards instead of the defaults boards, replace the bitmaps on the challenger,modern,modern2,news, bataleur etc. folder (e.g. c:/nagaskaki/images/modern) with the new bitmaps in the downloaded file (see readme file in most downloaded  files)  GoldTrim Pieces by Pete board_1.rar by DPA09 Earth, Leopard, Marble, Rose, …