Circuit-Zone.com - Electronic Projects
Posted on Tuesday, April 8, 2008 • Category: FM Transmitters
Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16×1 LCD.
Posted on Tuesday, April 8, 2008 • Category: PCB
To design my circuit boards, I use the freeware version of the Eagle Layout Editor by CadSoft Computer GmbH. The software is located in the download area of their site.
I give an introduction to Eagle under the category Eagle CAD. For convenience, here is a list of the posts:
* Eagle 1: Description
* Eagle 2: Libraries
* Eagle 3: Setup
* Eagle 4: Schematics
* Eagle 5: Components
* Ground Pour
* Setting All Drill Sizes
* Setting All Pad Sizes
Posted on Tuesday, April 8, 2008 • Category: AVR
My goal is to build a kind of a mobile tracker. There are many different use cases you can think of but one of the obvious is a device, that is able to report where it is. This device can be put in your car and it could trigger an alarm, if the car got stolen. Actually it could tell you where it is.
There are already mobile tracking devices out there, but they seemed to be too expensive and too closed for my needs. Another option is one of these new Nokia N95 which have built-in GPS. They are really nice, but about 600€, which is not a bargain. So I decided to do my own.
Posted on Tuesday, April 8, 2008 • Category: Test and Measurement
This is 50MHz Frequency counter based on AVR.It is designed by Ulrich Radig from German.He writes:The construction of a small Frequenzzähers thanks to the current Atmel AVR controllers or even the microchip PIC controller (to name but two) relatively quickly and easily. These are mostly internal timer / counter of the controller is used. The counter is supported by the adjacent signal at high input clock counted. The timer will be the counter to a specified time ever out and reset. Let’s take a look at a 20Hz TTL signal taktet to counter it is now in the counter register for a second of value 20 This is exclusively on the display or serial interface. After a successful auction at a relevant Internet auction house, I bought some 7Segment ads, I had to think of something. The result was therefore a little cheaper said 50MHz frequency counter, which I will not be denied.
Posted on Monday, April 7, 2008 • Category: USB Soundcards / USB Headphones
This is a high fidelity external USB Soundcard / USB Headphones project that can be built for your PC or Mac. It is based on the latest PCM2706 IC which functions as a high quality, crystal clear 16-BIT Stereo DAC. It is a single chip digital-to-analog converter that offers two D/A output stereo channels, digital S/PDIF output and requires very few external components. PCM2706 includes integrated USB 1.0 & USB 2.0 compliant interface controller and it is conveniently powered directly from USB connection. PCM2706 is a USB plug-and-play device and does not require any driver installation under Windows XP and Mac OSX.
PCM2706 chip also provides seven functions that are controlled with tactile switches. It provides volume (up / down), Play, Stop, Previous Track & Next Track controls. These functions do not need any software or driver installation and work instantly after connecting PCM2706 to a computer's USB connector.
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