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Robert i can not help you on that being resident in the UK. The machines are not expencive I was able to pick one up new the other week for £13 about 22$us at the current exchange rate. i suggest that you try a shop that provides photo copying services or a photo lab as they may be more likley to of...

Robert have you looked at useing a plastic laminateing the printed sheet. Thease machines are available at low cost from statonary stors once the page is laminated it gains stifness and is more durable. One thing to rember is not to forget to leave some of the plastic laminate areoud the edgw of the...

check that the case of the fan is not connected to the 0V (or in your case -12V) lead or you may end up shorting the supply.

Gps accuracy can be inproved using differential GPS it requires haveing a fixed GPS base station that reads in the GPS and compaires it to its actual position the error is then transmitted (via rf link ) to the mobile GPS receiver on the Kart the kart gets its position from it's own GPS receiver and...

First thing is to decide what you want the robot to do. Then this will identify what interfaces you will need which should define the requirements for the processor. I suggest to start you select something simple one option is a line following robot. This something that can follow a line drawn on a ...

just connect a microphone and preamplifer to the input of the wireless headphones and place the microphone close to the TV speaker

Tha gain of the preamplifer cna be set up to provide full volume when the volume of the TV is set to normal levels.

Paul you need to connect all of the address lines to 0V except the line that you are testing. or they will foat high. also try programming the eprom with a simple pattern that is easy to see what is happening a simple 1 to 1 relationship will be a start. eg address 0 data 0x01 address 1 data 0x02 ad...

look at useing a DC-DC converter expencive but will save the lcd screen one example is the <p>TEN 30-2412WI
9V to 40 volt input 12V out at 2.5A<p>Colin

Infra red devices will generally give you a yes / no decision of a object being present(the wall in yoyr case) to reflect the light it can be made immume to other light sources by modulateing the drive to the Infra red emmitter and looking for a modulated signal from the detector. <p>The ultra sonic...

A possable way would be to use ulta sonic range detection do a search for PICAXE (a low cost basic stamp look alike) Where thier is an ultra sonic module that is easy to interface. fit this ubove the robot angled so that the beam hits the wall about 6" infront of the robot. the distance will te...

you have two options either the source node will have to continousally re send the data in a loop untill it changes or the destination node will have to store the last received data. <p>a serial network of nodes was the bases of the now defunct transputer each transputer had 4 bi directional serial ...

just a thought if it is every 12 hours that uou will change the filter paper just get a mechanical clock mount it horisontally with the hands uppermost. remove the minute hand and fit the filter paper onto the hour hand this will then rotate once every 12 hours. you then need to arange for the outpu...

just to equal the balance i suggest you stick to the serial data and feed it in to a serial port (you may need to convert to RS232 levels first ) Visual Basic must still have some form of "open Com" commands to configure the serial port and and some form of input commpan to read from the p...

you could use a standard stepper moter driver ic that takes in pulses and rotates the moter one position per pulse now it depends on your stepper motor ie How many steps per one full rotation normally this is either 24 or 48 <p>For 48 steps you will need to multiply the input signal by 12 to get the...

if you want infromation try<p> http://www.ultra-scs.com/sonobuoys/index.htm<p>Colin