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30 Mar 2008


This is wireless FM transmitter project, when you speak into the transmitter and others hear you on any FM radio. The transmitter can be built in an afternoon with simple, affordable and widely available parts. Construction is fun and much can be learned although performance is modest; for example, your voice gets difficult to hear at distances greater than 25 feet. [via]

Wireless FM Transmitter – [Link]

30 Mar 2008


The triac lighting-control circuit in Figure 1 is small and inexpensive because load and housekeeping power come directly from the line voltage, thereby eliminating bulky, expensive supplies. The CLZD010 closed-loop controller maintains constant light intensity by automatically adjusting the timing of the triac’s firing until the feedback signal and setpoint command are equal. [via]

Triac light control – [Link]

30 Mar 2008


A high speed A/D converter (TLC5510) drives the USB module directly.Maximum clock rate is about 1MHz resulting in bandwidth limit of about 500KHz. The sampling rate may not be very exciting for RF people, but can be perfectly acceptable for audio and teaching work. [via]

Simple USB oscilloscope for the PC – [Link]

30 Mar 2008


The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving serial data from uController board. See example of U5 in the schematic, SER is for data input, SRCLK is shift clock and RCLK is Latch clock. Each data bit is shifted into the register on rising edge of the shift clock. When all data bits are shifted into the 8-bit register, the rising edge of RCLK will clock the data to be latched at each output bit. [via]

SPI Interface Big 7-Segment LED – [Link]

30 Mar 2008


Seb Lee-Delisle made this cool particle system using an Arduino board and an 8×8 LED array. He writes:

The only real trick here is that I’m working internally with a much higher resolution that the actual 8×8 grid, and then rounding to the nearest pixel when displaying each particle. This gives a really smooth movement. I’m only actually lighting one LED per particle but due to the Persistence of Vision (POV) effect it looks like there are more. [via]

Arduino particle system – [Link]

27 Mar 2008


CodeLock is an AVR based electronic combination lock it is realised with Atmel AVR microcontroller AT90S2313 or ATtiny2313.This project used for access control. Program in hex code is 2 kB long. User code is consisted of 1 to 4 digits. If you buy the chip than user code is consisted of 1 to 8 digits. If the code is entered in the correct sequence, then after 1 second the relay and the electric striker (in the door) switch on for 1 second and then switch off again. User code can be changed via 3×4 matrix keypad. [via]

AVR tiny code lock – [Link]

27 Mar 2008


This project like others capacitance meter that use charging time measurement technique (τ=RC). Circuit is really simple. There are three buttons used. Two of them are used to calibrate capacitance meter in order to remove stray capacitance. Third button is used to save calibration data to EEPROM memory. You can download assembly source code compile and burn to PIC16F873A microcontroller. I guess this is a nice tool that fits in to collection. [via]

Auto-range capacitance meter – [Link]

27 Mar 2008


GoldPic 3 Pulse Induction Metal Detector Features :Fast Response Non-Motion All-Metal Silent Search Mode ,digital processing of the detection signal ,sensitive Analog / Digital Converter ,push Button Threshold Zeroing ,microprocessor Controlled ,liquid Crystal Display ,easy to build & use. [via]

GoldPic 3 Pulse Induction Metal Detector – [Link]

27 Mar 2008


This incredibly simple thermometer plugs on any free serial port. Does not make use of any programmable components as microcontrollers. It gives temperature readings accurate to 0.5′C with no calibration. It’s also inexpensive, you can put one on any PC and make the temperature shown on the Windows taskbar. [via]

DS1621 pc thermometer – [Link]

26 Mar 2008


Wow,this is very cool board-less radio transmitter designed by Shadle who is the member on flickr.com. He is assembled this intricate radio transmitter circuit for the QRP Kits Pacificon building contest.It very amazing No PCB.This circuit can transmit frequency between 7.039MHz and 7.041MHz. [via]

Board-less radio transmitter – [Link]





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