Archive for the ‘Uncategorized’ Category

Giant Digi-Comp II Recreates Mechanical Computer from 1960s

Wednesday, November 14th, 2012

From the comments on our earlier Mechanical Donkey Kong post: I love this kind of stuff. Here’s another one, totally mechanical, that you may not have seen before: Giant Digi-Comp II Recreates Mechanical Computer from 1960s Maker Faire NY 2011 and the Digi-Comp II Via the comments.

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App note: High power LED driver with PIC12F675

Saturday, September 15th, 2012

A current controlled buck converter for driving high-power LEDs. The PIC12F675 microcontroller has an integrated comparator, which in combination with a low pass filter provides a control circuit for the SMPS. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675...

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Medium box of parts

Thursday, September 6th, 2012

A Mouser order with parts for the atx breakout board case arrived. Also some odds and ends for the dp badges for NY. This is a test using a WordPress post instead of twitter. Let us know if it gets too petty.

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Ghosts in the ROM

Thursday, August 30th, 2012

Ghosts in the ROM: While digging through dumps generated from the Apple Mac SE ROM images we noticed that there was a large amount of non-code, non-audio data. Adam Mayer tested different stride widths and found that at 67 bytes (536 pixels across) there appeared to be some sort of...

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USB POV Toy free PCB build

Friday, July 20th, 2012

Here's one you don't see often. Matseng built a free USB POV Toy PCB. These almost never get built due to the challenging QFN chip. The POV Toy is a hand-held persistence of vision toy that can be updated over USB. Check out our workshop video about the latest developments...

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Posted in builds, Uncategorized | 3 Comments »

App note: Porting the Helix MP3 decoder to PIC32MX microcontrollers

Sunday, March 4th, 2012

Microchip shows how to port the open source Helix MP3 decoder algorithm to the PIC32MX family of microcontrollers. This algorithm was designed be used by both floating point processors, and fixed point processors like the PIC32. Application note describes the procedure to port the open source Helix MP3 decoder algorithm...

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Posted in app notes, Uncategorized | 2 Comments »

3D Model: Bus Blaster v2.0a1

Monday, February 20th, 2012

Our latest 3D model is the Bus Blaster v2.0a1. We continued to play around with Maxwell's free rendering plugin for SketchUp. We reduced the gloss on plastic components, as per Jerome's advice, for even more realistic rendering. Thanks Jerome. The models will be published in the Dangerous Prototypes 3D warehouse...

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App note: Designing with ultra fast comparators

Saturday, February 18th, 2012

Here is an app note from Linear Technology covering the problems and solutions of designing circuits with ultra-high speed comparators. More specifically the problems associated with using their LM1394 7ns single supply comparator. The mechanics and subtleties of achieving precision circuit operation at DC and low frequency have been well...

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App note: High-Speed PWM module on PIC24E and dsPIC33E

Sunday, December 25th, 2011

Here's a reference guide from Microchip about the high-speed PWM modules found on some PIC24E and dsPIC33E microcontrollers and digital signal processors. This module is a advanced version of the standard ECCP pulse-width modulator on PIC microcontrollers. It's designed mainly for power conversion and electric motor control. The feature list...

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Krohn-Hite DC voltage standard teardown & calibration

Thursday, October 27th, 2011

[embed][/embed] Dave reviewed the Krohn-Hite DC Voltage precision power supply he bought. After checking if it was working within specs, he proceeded to open it up and see what it was made of. There were a few surprises inside, like the resistor voltage dividers were in the standard Kelvin topology,...

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Last chance to print your tweets @dangerousproto

Sunday, July 3rd, 2011

Get your tweets in now, the Thermal Tweeter live stream will end later this week. Send a tweet to @dangerousproto and watch it print out live on the USTREAM feed. The Thermal Tweeter is sitting in the photo studio, and we need it back to document a few new projects....

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CubeSpawn an open source manufacturing system

Wednesday, June 29th, 2011

CubeSpawn open source manufacturing system: Eventually it will have a metal cutting milling machine, a lathe, a surface grinder, a RepRap module and many other capabilities. It is completely open source and my goal is that whoever decide to build these cubes will be able to exchange designs and programs...

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OHANDA: Open Source Hardware and Design Alliance

Tuesday, June 14th, 2011

OHANDA, the Open Source Hardware and Design Alliance is an initiative to foster sustainable sharing of open hardware and design. The idea is for designers and manufacturers of open source hardware who wish their work to conform to the "Four Freedoms" of open source hardware to label their work the...

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Diy Superprobe

Wednesday, February 23rd, 2011

Ben Ryves built his own version of the superprobe. having no need for some of the standard features he has modified the source for additional functionality. there is an excellent video of Ben demonstrating his superprobe after the break. (more…)

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Posted in PIC, tools, Uncategorized | 6 Comments »

Revisit: 8bits

Wednesday, January 19th, 2011

last week we asked, what microcontroller architecture do you use most? Many of our projects use 8 bit pic18 series micros, clearly a workhorse of our projects. But with only 16 votes total, our poll is probably not representative of the larger community. We have recently seen a audio spectrum...

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Recent Comments

  • gant: They still have a couple of the more expensive (but still considerably cheap) 5S-I-S01 in stock...
  • readybrek: Anyone got a any recommendations for a budget-priced hot air station?
  • William: lol I'm happy to waste 3c for each program/debug cycle... but probably not the time spent soldering a new device down to a proto board!...
  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!