video by Bethany.
Author: abram
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Bending notes with PT2399…
i’ve been experimenting with this PT2399 chip and using various schematics to create a digital delay circuit. the delay time seems to be directly attached to the sample rate since lengthening the delay time gives a nice decrease in pitch. i’m toying with the idea of dropping a time constant in around the controlling delay time circuit to see about achieving a “tape warble” sort of effect. we’ll see what works.
here’s the schematic i’ve been working with though the values i’m using are hardly similar.
[audio:http://abrammorphew.com/notes/wp-content/uploads/2010/11/pt2399-demo01.mp3|titles=pt2399-demo01] -
Photos from space…
APT (Automatic Picture Transmission) is a relatively older method of transmitting satellite photography. I’ve been attempting to catch a pass of the NOAA weather satellites for quite some time now, but feared that the radio interference of New York City would make it difficult without building some gear. My assumptions were correct… but not entirely.
I finally was able to get a clear pass during my lunch break today outside with the trusty VX-3R and a Nagoya NA-771 antenna. Much to my amazement, I was able to develop a picture that showed today’s exceptionally clear skies all the way into Canada.
[audio:http://abrammorphew.com/notes/wp-content/uploads/2010/11/NOAA18-111210.mp3|titles=NOAA18-111210] -
LightBox prototype
here’s a small battery-powered guitar amp that i’ve constructed from reused parts. the housing is a busted computer power supply (some of which is in the No. 5) as well. i’ve got several options for this little fellow in mind, but, for now, it’s a tiny amp with a mean distortion. lo-fi enthusiasts should contact me if you’d like one custom built.
LightBox Prototype: a battery-powered guitar amp w/ distortion from abram on Vimeo.
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No. 5 speaks.
and what a lovely voice it is. even through a Crate speaker (i’m saving the better speakers for when the testing phase is over). overall, i’d say a success for cheap transformers, Radio Shack parts, and a few pieces taken from a busted computer power supply.
audio notes: it was late, and i was annoying enough playing at midnight. the mic is sitting just above the speaker which was laying face up in a milk crate. i’m currently using a 100k audio pot, and i think it would fair better with a 1M. overall though, the amp is surprisingly quiet at mid volume. i still need to drill out the hole for AC connector, but it will come in due time. for now, it’s making sound and that’s a huge first step for me.
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No. 5 come alive!
like Dr. Frankenstein, it’s about time to bring this little fellow to life… or at least try. the schematic i have is a random luck of the draw internet find, and i have no idea whether or not it will work. however, testing will occur on the work bench soon enough to determine what needs to make this single-ended 5watter amplify.
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Piping hot ball of Tar.
For those who have gotten into the idea of typing commands as little as possible, here’s out to pipe the output from tar straight into a gzip file.
tar cvf - myfile.jpg | gzip > myfile.tar.gz tar cvf - folder | gzip > folder_backup.tar.gz
Take note of the second example and notice how folder does not contain the trailing forward slash. The forward slash denotes everything inside the folder while leaving it off copies the entire folder itself into the archive. This way causes the extraction process recreate the folder while to former will only extract the files within the folder.
