Do-it-yourself projects and technology updates

Monday, August 13th, 2007

DIY Spy Ear reverse engineering

Here is a project that I have often thought of. I hope we have all seen those amplifier spy toys for like a dollar. I have often thought of grabbing one, and using the circuit to make something cool. It would probably work as a headphones amplifier. You could even stick it into an altoids [...]

Sunday, January 15th, 2006

Simple FM Radio

Here is a perfect simple one transistor FM radio to build. Here is a good starter DIY project for anyone interested in audio. This simple radio uses an inductor as both the oscillator circuit and the antenna. It just uses one JFET transistor. There are two designs on this site. The first one is a [...]

Saturday, January 14th, 2006

DIY Stereo FM transmitter 2

I recently told about the BA1404 stereo fm transmitter integrated circuit. It is the main chip that you find in most kits (I have done kits. They usually are solder by number, and don’t really teach you anything, unless you really study them, and are therefore not much fun. It is much better to do [...]

Wednesday, January 11th, 2006

DIY iPod stereo FM transmitter

After posting about the simple FM transmitter, I decided that I wanted to try to make a stereo transmitter for an iPod. Something like the Griffin iTrip. This would not have to be just for an iPod, but could be for basically any stereo signal that you wanted to send to a stereo. After seeing [...]

Friday, January 6th, 2006

DIY Binary Clock

Here is something I found from one of my readers at superpositioned.com. This is a new site that has some good projects. I encourage you all to check it out. Anyway, he found a binary clock that is built entirely from counters and LEDs. This is a neat project to do, but is pretty complicated. [...]

Thursday, January 5th, 2006

Basic Circuit analysis

To start this off, it is important for everyone to understand some simple electrical engineering concepts. Electricity is simply the flow of electrons from one place to another. There are two things that describe how the electrons flow. One is how much force is driving the electrons to flow. This is what voltage is. The [...]

Tuesday, January 3rd, 2006

Variable Voltage Regulator

Here is another must need circuit for the DIYer. We have seen the 7805 5v voltage regulator, but sometimes that is just not enough. The LM317 is an integrated circuit that can have an output voltage of anything from 1.25 to 37 volts. The above circuit though is limited to 1.2v to 25v. This circuit [...]

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 [...]

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 [...]

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