Always thought of making your own PC based signal generator?
Advantages of PC based signal generator: –
1. Low cost, no need to spend lot of money (costs about Indian Rs.30 = US$0.67 = costs almost nothing).
2. Can generate complex signals, like Sin(f1) + Sin(f2). Any function that you can write and understand its limits can be generated from PC.
3. Easier to operate, because, most people who finds signal generator useful are well versed in computer software + hardware.
4. If you use a output buffer amplifier, the chances of damaging your PC sound card is very small. In other words, it is safe.
5. Portable i.e only laptop is needed. Do not need to carry one more signal generator.
6. Use PC sound card, unless you listen to lot of music while working on electronics stuffs.
PC Based Signal Generator – [Link]
Getting into the Winter Spirit, we decided to freeze a contact mic and record it as it defrosted. In order to freeze it, we placed it in a small dish and left it outside overnight, as the Labs aren’t equipped with a freezer! To speed up the process, near-boiling water was poured into the bowl on top of the ice.
Frozen Contact Mics – [Link]
Generating sound waves from PC sound card isn’t new ting. You can even download tons of software that allows generating various waves like sine, square, triangle waves on speaker output. Such sound generator gives quite good results that are acceptable in most situations like testing audio equipment or feeding complex signals in to your projects.
Generating complex sound waves on PC – [Link]
openmusiclabs.com writes: [via]
Electret microphones are the most commonly used microphones today. Every cellphone and laptop has one embedded into it, and many studio microphones are also electrets. They can have an extremely wide frequency response (from 10Hz to 30kHz ), and typically cost less than a dollar. They are also very small and quite sensitive. Despite these good characteristics, they can also have a few drawbacks, such as a high noise floor, high distortion, and uneven frequency response. We will dissect an electret microphone, explain how it works, and talk about the reasons for its various attributes.
Electret Microphone Dissection – [Link]
Dino from Hack A Week posted his first project for April Fool’s day, “Screaming Altoids“: [via]
I decided to create “Hack A Week”!
This is no April Fool’s day joke, it’s real. I’ll be posting one project a week for at least the next year! Big challenge yes, but also lots of fun! Stop in and see the first project for April Fool’s day, “Screaming Altoids”.
Hack A Week: Screaming Altoids – [Link]
blog.makezine.com writes: [via]
While most people would simply throw away an out-of-warranty iPod with a broken play/pause button, Craig gave his a new lease on life by attaching a custom-hacked dock connector. Inside the connector, he stuffed an ATtiny 13 microcontroller with a few other passive components. Now when he pushes the button on the connector, the ATtiny sends the appropriate serial command to the iPod to start or stop the music.
Custom Hardware to Fix Broken iPod – [Link]
This amplifier is based on the PA100 parallel amplifier detailed in National Semiconductor’s application note – AN1192.
Since my DIY speaker is 4-ohm and somewhat difficult to drive, I want to have a more powerful amplifier to match with it. Therefore I designed this amplifier which uses two LM3886 per channel, in parallel circuit. This amp can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used.
100W LM3886 Parallel Stereo Power Amplifier – [Link]
Howto: Build a Cigar Box MIDI Controller for Max/MSP… [via]
The previous howto described the process of making a jumbo-sized MIDI controller. In this howto, the MIDI CPU is used to make a more compact device: a cigar box MIDI controller that can control Max/MSP (and any other MIDI software or hardware).
Howto: Build a Cigar Box MIDI Controller for Max/MSP – [Link]
[Brett] build these beautiful set of Apple-inspired computer speakers.
Apple-inspired computer speakers – [Link]