May 22, 2008
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Scott shows you how to modify a PC sound card to allow D.C. voltage measurements, he writes -
A PC Sound Card typically contains a sixteen bit ADC (or two if capable of capturing in stereo) which is used to digitise A.C. signals in the audio frequency range. In its typical audio application the ADC is intentionally isolated from any D.C. applied to input ports by series capacitance and so cannot be used to capture D.C. This page describes a general method for modifying a PC sound card to permit the digitisation of D.C. signal levels allowing a sound card’s ADC to be used as the basis of a simple and accurate ground referred voltmeter with millivolt or better resolution.
Related:
MAKE:it - Electronic Makers Toolkit @ The Maker store. Hand picked by our Makers this kit features everything you need to get started with electronic construction.
Features:
- Soldering Iron
- PCB Vise Panavise “Jr”
- Small (7.8″) DeSoldering Pump
- Soldering Stand with sponge
- 0.5lb 60/40 Solder
- Desoldering Braid
- Wire Cutters/Stripper
- Shear Cutters
- 7-Function 2000-Count Multimeter
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Scott shows you how to modify a PC sound card to allow D.C. voltage measurements, he writes -
A PC Sound Card typically contains a sixteen bit ADC (or two if capable of capturing in stereo) which is used to digitise A.C. signals in the audio frequency range. In its typical audio application the ADC is intentionally isolated from any D.C. applied to input ports by series capacitance and so cannot be used to capture D.C. This page describes a general method for ... Read More
May 22, 2008
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Check out some of the latest makeuseof discoveries. All listed websites are FREE (or come with a decent free account option). No trials or buy-to-use craplets. For even more app reviews subscribe to makeuseof directory. Want to submit your application to MakeUseOf directory ? See how here.
(1) A.nnotate - Useful tool if you need […]
Check out some of the latest makeuseof discoveries. All listed websites are FREE (or come with a decent free account option). No trials or buy-to-use craplets. For even more app reviews subscribe to makeuseof directory. Want to submit your application to MakeUseOf directory ? See how here.
(1) A.nnotate - Useful tool if you need people to give you feedback on a document or a website, without emailing each other different versions back and forth. Read more: A.nnotate - Annotate PDF, Word, ... Read More
May 22, 2008
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Welcome to the cat future, all doors will scan your cat’s microchip (RFID) and if it’s your cat it can come inside…
Keeps out unwanted cats by using your cat’s existing microchip number without the need for a collar. Automatically detects light levels and can keep your cat in at night. Designed by a vet.
Related:
RFID for Makers. Build this kit to read radio frequency ID tags. Subscribers—read this article now in your digital edition!
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Welcome to the cat future, all doors will scan your cat's microchip (RFID) and if it's your cat it can come inside...
Keeps out unwanted cats by using your cat's existing microchip number without the need for a collar. Automatically detects light levels and can keep your cat in at night. Designed by a vet.
Related:
RFID for Makers. Build this kit to read radio frequency ID tags. Subscribers—read this article now in your digital edition!
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May 22, 2008
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Last week I ran into Troy Lane Williams, founder of PeoplePad, a stealthy Austin-based startup that’s creating some kind of front-end portal for the semantic web. I have no idea what the finished product will look like, but Williams’ previous startup experience has colored PeoplePad’s product and its formation.
Williams may be familiar to readers who […]
Last week I ran into Troy Lane Williams, founder of PeoplePad, a stealthy Austin-based startup that’s creating some kind of front-end portal for the semantic web. I have no idea what the finished product will look like, but Williams’ previous startup experience has colored PeoplePad’s product and its formation.
Williams may be familiar to readers who recall his involvement in Questia, the pre-Google Books, subscription-based online library that launched in 2001 with $150 million in backing. Questia is still in business, but ... Read More
May 22, 2008
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I spent most of the day digging up more information on Twitter and its new round of funding that I reported last night. The update is that Twitter reached an agreement with investors today to raise $15 million in funding at around $80 million pre-money valuation. A new investor is leading the round with existing […]
I spent most of the day digging up more information on Twitter and its new round of funding that I reported last night. The update is that Twitter reached an agreement with investors today to raise $15 million in funding at around $80 million pre-money valuation. A new investor is leading the round with existing investor Union Square Ventures also participating. With this round, the company will have raised a little over $20 million in VC backing thus far.
Official news of ... Read More
May 22, 2008
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open source job board review
open source job board review Read More
May 22, 2008
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For web and shareware games there actually is something like “fast enough”. Know your target, reach it, and focus on more important things than performance.
For web and shareware games there actually is something like "fast enough". Know your target, reach it, and focus on more important things than performance. Read More
May 22, 2008
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Very cool Curta calculator via jwz.
The Curta was a small, hand-cranked mechanical calculator introduced in 1948. It had an extremely compact design, a small cylinder that fit in the palm of the hand. It could be used to perform addition, subtraction, multiplication, division, and, with more difficulty, square roots and other operations. The Curta’s design is a descendant of Gottfried Leibniz’s Stepped Reckoner and Thomas’s Arithmometer, accumulating values on cogs, which are added or complemented by a stepped drum mechanism.
Ok - who has one or has used one?
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Very cool Curta calculator via jwz.
The Curta was a small, hand-cranked mechanical calculator introduced in 1948. It had an extremely compact design, a small cylinder that fit in the palm of the hand. It could be used to perform addition, subtraction, multiplication, division, and, with more difficulty, square roots and other operations. The Curta's design is a descendant of Gottfried Leibniz's Stepped Reckoner and Thomas's Arithmometer, accumulating values on cogs, which are added or complemented by a stepped drum mechanism.
Ok - ... Read More
May 22, 2008
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Recently we got a new contributor on RSS Bandit who uses the ReSharper refactoring tool. This has led to a number of changes to our code base due to suggestions from ReSharper.
Recently we got a new contributor on RSS Bandit who uses the ReSharper refactoring tool. This has led to a number of changes to our code base due to suggestions from ReSharper. Read More
May 22, 2008
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Free vector world maps can not be found easily as there are only few around.
Here is a collection of free vector world maps that you can use in your projects:
Free vector world maps can not be found easily as there are only few around.
Here is a collection of free vector world maps that you can use in your projects: Read More
