All posts on May, 2010
This project uses a Microchip PIC microcontroller and an Infra-Red LED to act as a PC controlled cable TV changer.It’s use to change channels on the cable TV set-top box when making a recording.A very simple program on the computer sends the channel number over RS232 to this PIC based IR transmitter which creates the correct waveform for the digits to be sent. [more]
The Soundcard Oscilloscope receives its data from the Soundcard with 44.1kHz and 16 Bit resolution. The data source can be selected in the Windows mixer (Microphone, Line-In or Wave). The frequency range depends on the sound card, but 20-20000Hz should be possible with all modern cards. The low frequency end is limited by the AC coupling of the line-in signal. Be aware, that most microphone inputs are only mono. Donwload from link below.[more]
This is a challenging project to build the laser projector with professional grade. The most important component used for laser projectors is the laser unit. He-Ne laser had been used in early days, multi-colored mixed gas laser is currently used for high end laser projector and solid state laser is one of the brand-new laser device that has been recently used.[more]
An oscilloscope is probably the most important instrument for observing and measuring electronic circuits. It allows you to observe timing, voltages, slopes, curves, and spikes of an electronic signal. A good digital oscilloscope can easily run you over $1000, but this scope will cost you a grand total of $40 for the kit, perhaps the cheapest scope you will ever buy. [more]
This is a simple SD audio player biult with only an 8-pin microcontroller. The ATtinyX5 series (25/45/85) 8-pin AVR microcontroller has two fast PWM outputs in 250kHz carrier frequency. This enables to output a wide frequency range audio signal.[more]
