jm + analog   6

Reverse engineering the 76477 "Space Invaders" sound effect chip from die photos
Now _this_ is reversing:
Remember the old video game Space Invaders? Some of its sound effects were provided by a chip called the 76477 Complex Sound Generation chip. While the sound effects1 produced by this 1978 chip seem primitive today, it was used in many video games, pinball games. But what's inside this chip and how does it work internally? By reverse-engineering the chip from die photos, we can find out. (Photos courtesy of Sean Riddle.) In this article, I explain how the analog circuits of this chip works and show how the hundreds of transistors on the silicon die form the circuits of this complex chip.
space-invaders  games  history  reverse-engineering  chips  analog  sound-effects 
12 weeks ago by jm
littleBits Synth Kit
Wow, this looks cool. $159
littleBits and Korg have demystified a traditional analog synthesizer, making it super easy for novices and experts alike to create music.
connects to speakers, computers and headphones.
can be used to make your own instruments.
fits into the littleBits modular system for infinite combos of audio, visual and sensory experiences
diy  hardware  music  littlebits  gadgets  make  analog  synths 
december 2014 by jm
rendering pcm with simulated phosphor persistence
This is something readily applicable to display of sampled time-series metric data -- it really makes regular patterns visible (and is nicely retro to boot).
When PCM waveforms and similar function plots are displayed on screen, computational speed is often preferred over beauty and information content. For example, Audacity only draws the local maximum envelope amplitude and (what appears to be) RMS power when zoomed out, and when zoomed in, displays a very straightforward linear interpolation between samples.

Analogue oscilloscopes, on the other hand, do things differently. An electron beam scans a phosphor screen at a constant X velocity, lighting a dot everywhere it hits. The dot brightness is proportional to the time the electron beam was directed at it. Because the X speed of the beam is constant and the Y position is modulated by the waveform, brightness gives information about the local derivative of the function. Now how cool is that? It looks like an X-ray of the signal. We can see right away that the beep is roughly a square wave, because there's light on top and bottom of the oscillation envelope but mostly darkness in between. Minute changes in the harmonic content are also visible as interesting banding and ribbons.


(via an _amazing_ kragen post on ghetto electronics)
via:kragen  pcm  waveforms  oscilloscopes  analog  analogue  dataviz  time-series  waves  ui  phosphor  retro 
june 2013 by jm
Russian watch RAKETA 24 hour white dial. Polar design. on eBay
24-hour analog CCCP-era Raketa watches. want. almost definitely fake going by the price, but still very nifty (via adampsyche)
russia  raketa  watches  analog  want  24-hour  via:adampsyche  from delicious
june 2010 by jm
Dutch forum thread on splitting analog signals from a UPC Thomson DCI-6221 DVR
I'm trying to figure out how I can rebuild a MythTV box with new UPC equipment. this claims that you can split the cable before it enters the Cisco cablemodem, and get analog TV off the basic cable that way. hmm
analog  tv  upc  mythtv  dci6221  mediabox  cable-tv  from delicious
may 2010 by jm
the world’s largest DVR
SnapStream's 100TB rack which records 50 analog TV channels simultaneously
snapstream  video  tv  storage  hardware  analog  television  from delicious
may 2010 by jm

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