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PCM2706 High Fidelity USB Soundcard / USB Headphones
Posted on Monday, April 7, 2008   •   Category: USB Soundcards / USB Headphones

PCM2706 High Fidelity USB Soundcard / 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.




PIC Dual Temperature Meter
Posted on Sunday, April 6, 2008   •   Category: Test and Measurement

PIC Dual Temperature Meter

This is a simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Meter can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit). Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware. Presented PIC temperature meter uses two very exciting DS18S20 1-Wire digital temperature sensors. Unlike regular sensors where temperature readings are passed as varying voltage, DS18S20 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable.




Dual Channel 70V PIC Voltmeter
Posted on Sunday, April 6, 2008   •   Category: Test and Measurement

Dual Channel 70V PIC Voltmeter

PIC voltmeter can measure 0-70 Volts which should be more than enough for most of electronic projects providing excellent reading accuracy and resolution. It has two input channels for measuring two voltage sources at the same time. This PIC voltmeter project uses PIC16F876 microcontroller with built-in ADC (Analog to Digital Converter) and 2x16 backlighted LCD display.




PIC Programmer for PIC18F2550
Posted on Saturday, April 5, 2008   •   Category: PIC

PIC Programmer for PIC18F2550

Developed specifically for programming of PIC 18F2550 micro controllers, this parallel port, no-power, programmer is the smallest of all programmers ever built. A DB25 Male Connector, one capacitor and a resistor makes this Port Powered programmer. Programmer takes its power from Parallel Port pins 2-9. VPP for this programmer is 5V and hence "LVP" must be selected in programming software.




AVR Programmer
Posted on Saturday, April 5, 2008   •   Category: AVR

 AVR Programmer

This simple AVR Programmer will allow you to painlessly transfer hex programs to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time. AVR programmer consists of in-circuit serial programmer (dongle) and small pcb with a DIP socket where you can fit your microcontroller and have it quickly programmed. You may also use this programmer as a stand alone in-circuit serial programmer that can be used to conveniently program AVR microcontrollers without removing them from the target circuit.




Accurate LC Meter based on PIC16F84A
Posted on Thursday, April 3, 2008   •   Category: Test and Measurement

Accurate LC Meter based on PIC16F84A

This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself. This LC Meter allows to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance from 0.1pF up to 900nF. LC Meter's circuit uses an auto ranging system so that way you do not need to spend time selecting ranges manually. Another neat function is the "Zero Out" switch that will reset the initial inductance / capacitance, making sure that the final readings of the LC Meter are as accurate as possible.




Simple FM Receiver
Posted on Thursday, April 3, 2008   •   Category: FM Radio / Receivers

 Simple FM Receiver

With the TDA 7000 you can build an FM radio with a minimum of components; most of them so easy to manage...like the ceramic capacitors that do not require polarization...and only two resistors. The components you will employ will be of small dimensions and low cost. Even the integrated circuit itself, the TDA 7000, is not of great cost.




ICL7107 / ICL7106 - Digital Voltmeter
Posted on Thursday, April 3, 2008   •   Category: Test and Measurement

ICL7107 / ICL7106 - Digital Voltmeter

This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA.




BA1404 HI-FI Stereo FM Transmitter
Posted on Wednesday, April 2, 2008   •   Category: FM Transmitters

BA1404 HI-FI Stereo FM Transmitter

Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast a high quality stereo signal in the 88 – 108MHz FM band. It can be connected to any type of stereo audio source such as personal computer, CD player, Walkman, television, tape deck or stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.




1.3 - 32 V / 5A Power Supply with Short Circuit Protection
Posted on Wednesday, April 2, 2008   •   Category: Power Supplies

 1.3 - 32 V / 5A Power Supply with Short Circuit Protection

This is a LM338 based power supply which is not complicated and easy to build. I am using the supply for a long time, have no problem yet. Only current adjust is missing but I overcome this situation by using an LCD panel ampermeter. There is no PCB for the circuit. I took a 3x16 copper plate and strip the unused areas by a knife. If you want you can use analog meters instead of LCD panels.




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