Do-it-yourself projects and technology updates

Friday, December 30th, 2005

Voltage Divider

The Voltage divider is an important circuit to use in several applications. It can be used in a power supply where you need a + and a – voltage. In the CMOY pocket amplifier, the two 10K resistors are used in conjunction with the 2 9v batteries to make a 0V, or ground pin, as [...]

Tuesday, December 27th, 2005

Decode telephone touch tone

Here is a quick cool thing to look at. I really want to design something using telephone touch tone. It is 2 frequencied combined to make the tone, and here is an article on getting a encoder and decoder. I will do better updates after the holidays. Things are crazy now, and I am at [...]

Monday, December 26th, 2005

Long Distance Remote Control

Here is a very thorough article on optical communications. It gives all of the physics behind it as well as many good circuits that one can build. Using the techniques discussed in this article, you could make your TV remote control work a mile a way. It is very interesting. … The Handbook guides you [...]

Saturday, December 24th, 2005

Line Following Robot using Comparator

This article is from a link on one of my posts. He built a line following robot out of a plastic sandwich container, so he named it “Sandwich”. This robot is similar to my line following robot, but it does not use a microcontroller. He just used a comparator. This circuit will make a decision, [...]

Friday, December 23rd, 2005

Have a Merry Christmas

Well, I hope you all have a merry Christmas. I am going to my Fiancee’s grandmother’s house, so won’t be near internet for a while. I will update in a few days. Thanks everyone for coming to my site. I hope you enjoy it. Greg

Thursday, December 22nd, 2005

Run out of pins on your PIC chip?

I remember when I was building my line following robot that I ran out of output pins. I was using two sensors as inputs, and just didn’t have enough output pins left to control the motors the way that I wanted to. Here is an article on how to make an external multiplexor that will [...]

Wednesday, December 21st, 2005

DIY bike powerd iPod charger

Here is a guy that first connected a handcharger to his ipod. This link can be found here [Link] He did this by taking a hand crank flashlight. His charger actually output a 6 volt current. He used some diodes to keep the ipod from charging the flashlight, and these diodes also cut the voltage [...]

Wednesday, December 21st, 2005

DIY FM transmitter

This is an article that I am very interested in. It is not so important to me to have the capability of using a microphone to transmit over FM, but, I want to try to build an FM transmitter to use as a remote control. There are other uses of this circuit. It can be [...]

Monday, December 19th, 2005

Ten most needed circuits for the DIYer

I have decided to compile a list of the top ten most needed circuits that are a must know for anyone interested in DIY projects. These are the basics that can all be interchanged and used in conjunction with each other to make many of the projects that we all love so much. 10. The [...]

Sunday, December 18th, 2005

12v power supply

There is always a need for a good power supply. Here is a schematic for a 12 volt power supply. Note this could also be done with a 7805 5v regulator, and a “T1 12.6 volt, 1.2 amp ac transformer” . The transformer brings the AC 120v down to around 18v, and the 4-diode rectifier [...]

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