i was wondering how these work the other day

via updo

an outstanding, must-see art piece. really incredible in person

good, and a little creepy

outstanding discovery

a DIY audiophile! welcome to SU, Gio :)

this might make a nice variable power supply or motor/actuator driver

yikes, is there some simpler way of making an analog shift register??

Denon AKDL1 Dedicated Link Cable
// ouch... but at *that* price, maybe a lambasting is deserved

using transistors or opamps to buffer a signal, so the signal doesn't distort (due to too much current being drawn from the signal's source)

led photosensor circuit

this is a cool and simple way of encoding analog information

really neat, and relaxing -- realtime audio from underwater, under the Antarctic ice

sea animals are out tonight!! :D

ignore the language, this is an interesting upgrade

excellent work. classic recordings can now be automatically picked apart for use in new compositions... with high sound quality

From the page: "Not only am I unintimidated by litigation; I sometimes rather miss it." thanks to ar0cketman :)

a *very* interesting design... i like the virtual ground & capacitance multiplier power supply noise-reduction

cool old alert sounds. remember Quack and Eep? :)

why can't playback devices do dynamic-range compression on the fly -- if we want it :(

guy builds a PWM class D audio amp from vacuum tubes, hahaha! a very cool idea

interesting audio contraption

fantastic 1950's product introduction; steve jobs couldn't have done it better

brilliant little experiment, found at catinette's pages

hmm... reports say this simple design sounds very good

Nelson Pass designs a JFET power amp in this article, and you can make one too :D

from the page:
"In the 1930s radio pioneer Guglielmo Marconi developed a system of magnetic sound recording using steel tape. This was the same material used to make razor blades, and not surprisingly the fearsome Marconi-Stille recorders were considered so dangerous that technicians had to operate them from another room for safety. Because of the high recording speeds required, they used enormous reels about one metre in diameter, and the thin tape frequently broke, sending jagged lengths of razor steel flying around the studio."

what a great audio PSU trick! :D

From the page: "there is a trick to further reduce PSU voltage drop and ripple in stereo LF arrangements. This is achieved by inverting the input signal of one of the channels and reversing the polarity of the load. As a conequence of that, both channels will seldom be drawing current from the same supply rail at the same time and PSU efficiency will be improved."

umm, happy thanksgiving?

fascinating idea

info on standard audio connectors, voltages, currents

intro to audio transformers

pretty simple!

thorough intro to class d audio amplifier design

"Low-Cost Audio Delay Line Uses 1-Bit ADC"
neat idea, and very cheap :D

Good idea, I'm going to try this.

Update: It works! I built the one-transistor amplifier on this page to boost the mic output up to line level for my Mac mini:
http://www.diylive.net/index.php/2005/12/19/ten-most-needed-circuits-for-the-diyer/

From the page: "an overview with specific pros and cons of the different approaches"

From the page: "What is needed to make a "good" audio Class D amplifier"

From the page: "eliminate cross conduction by forming back-to-back diodes with the body diodes of the MOSFETs".
I wonder if this technique has applications in class b or d audio amplifier design...