Make a sound card is no more a complex issue. If you use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional USB sound card. This sound card can be powered from USB port and has one stereo output. You don’t need to install any driver for Windows XP and Vista, because they are already inside. This is really plug and play.
USB Sound Card with PCM2702 - [Link]
Electronic Printed Circuit Board Layout Software that is a cost effective, easy to use electronic printed circuit board PCB layout application. Features: Export Gerber RS274X and Excellon NC drill. Import ASCII netlist. Up to 16 layer boards supported. Rulers, Guidelines and Dimensioning lines. Five libraries – new components and libraries can be added. Automated ground planes, isolated copper removal. Tracks snap to pads for easy routing. Multiple Undo / Redo. [via]
Rimu PCB - [Link]
DesignWorks Professional 4 is a low-cost, easy to use schematic capture application for professional electronics designers. The program is designed to minimize the number of mouse clicks and key strokes needed to complete a task. Most common operations, like placing a part or drawing a signal line, require no menu selections and no command typing. [via]
DesignWorks Schematic Capture - [Link]
LochMaster is a developers tool for stripboard projects. It has useful functions for designing, documenting and testing a board. Therefore you will find features like auto-generation of components lists, a connection test, an editable library with a large number of symbols and components, and many more. [via]
LochMaster 3.0 - [Link]
With sPlan you will design your schematic circuit diagrams clean and easy on your PC. Many powerful functions like the the extensive component library, the usage of free definable background form sheets, automatic component numbering, component searching, component lists, etc. will help you. Even beginners will create perfectly designed schematic diagrams within minutes. [via]
sPlan 6.0 - [Link]
This is PIC16F628 and pic16f84 base inductance/capacitance meter design by Phil Rice VK3BHR.Measuring range is from 0 to >0.1uF for capacitance and 0 to >10mH for inductance.Expected accuracy is +/- 1% of reading +/- 0.1pF or +/- 10nH.This project is a combination of two stolen designs.The oscillator design originally came from the AADE LC meter web page. It uses an LM311 comparator with positive feedback to make a parallel LC oscillator with digital output. It seems to oscillate readily over a wide range of L and C values. Hopefully, it follows the “well known formula for resonant frequency”.The frequency measuring part is a cut down version of the September 2002 Frequency Meter article from Amateur Radio magazine. The original idea for this came from the web pages of Eamon Skelton, EI9GQ. [via]
Surprisingly Accurate Digital LC Meter - [Link]
This circuit is a church bell controller. Basic component is an ATmega32 microcontroller. At the circuit 1 24LC32 eeprom memories is being used.
As control I created a menu who will be appeared on 4×20 LCD (Liquid Crystal Display). The menu browsing can be done by 6 buttons at the face of the circuit’s box (Menu, Up, Down, Enter, Start, Stop). The all firmware binds about 30Kbytes flash memory and can be increased by adding new features-functions. This program has been written in C with CVAVR compiler.
Church bell Controller - [Link]
I needed a pulsating light for a certain signaling. Voltage was 230V. So I decided to make a simple circuit, consisted of a LED diode, two capacitors, two resistors, a diac and a diode.
230V Blinking LED - [Link]
The MAX6953 from Dallas Maxim is a compact cathode-row display driver that interfaces a microprocessor (like PIC or AVR) to four 5×7 dot matrix LED display trough an I2C compatible serial interface. The chip includes some features that can help us to handle easier the displaced data. These features are included on chip ASCII 104 character table and also fond data for 24 user definable characters, low-power shutdown mode, segment blinking that can be synchronized across multiple drivers if desired, test mode that forces all LEDs on (so that we can handle led problems) and also 16-Step digital brightness control that maybe differs from panel to panel.
MAX6953 Development board - [Link]
This circuit measures temperature in Celsius scale and displays it on an alphanumeric LCD screen
When temperature rise to 40 C an alarm is activated and at the same time a relay is also activated which
drives a fan to keep the temperature at a level. Another feature of this circuit is that you can use the keys “1,2,3,4″ of a Philips TV IR remote to turn on or off three relays, The key ’4′ is used to turn on or off the over temperature alarm.
IR Digital Thermostat for FAN - [Link]