All posts in the 'Audio and Video' Category
Posted on 04 Feb 2008
Gary Dion’s AVR based video overlay titler, source and schematics included.The WhereAVR is a small, lightweight, low-power, and low-cost APRS tracker with a full compliment of analog and digital I/O, as well as the ability to decode ax.25 packets. This allows for the reception of remote commands without the need for a “real” TNC. It is designed to hook directly to the speaker and microphone jacks of a handheld radio. One caveat, however, is that it currently doesn’t have a spiffy configuration utility.[more]
Posted on 02 Feb 2008
One more thing. Right now, if you have an unusual amplifier or if you wire your amp incorrectly to the power detector project, you could short out your amp’s power outputs. Before building the project, use a continuity tester or ohmmeter to make sure your amp’s black (ground) speaker connections are tied directly together (< 1Ω resistance) inside the amp, and make sure you wire the amp to the power detector correctly.[more]
Posted on 31 Jan 2008
This SMD op-amp project uses the TI RC-4560 dual op-amp chip and a salt water-etched PCB. The builder got the op-amp as a free sample from Texas Instruments and scavenged all of the SMD resistors from old hard drive electronics. The results are not pretty, but they’re functional. The circuit used (with some changes) is the Chu Moy design found here. The CMoy circuit is not SMD. [more]
Posted on 22 Jan 2008
In this article David play around the code Michael Smith created for a PWM based DAC. David modified his code so that other DAC options could be tried. David compare the 8-Bit PWM DAC with the R2R DAC at various numbers of bits. You might be surprised at how well a 4-bit DAC sounds. This article includes several sound samples for the various DAC options and demonstrates some software abstraction that allows for multiple DAC options.[more]
Posted on 16 Jan 2008
This is a open source mp3 player project developed by TheThompsonFive who is the member on Flickr photo pool [more]
