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Here is a photo of a group of SubMix7 modules, the new Eurorack release from Low-Gain Electronics. We should have stock very soon.
Further info via this thread at Muff Wiggler: muffwiggler.com/forum/viewtopic.php?t=33840 .
We'll update our website when they are in-stock: www.analoguehaven.com/lowgainelectronics/ .
Seen Here: The PCB all soldered and with one LED matrix fitted.
Annoyingly, SparkFun are out of stock of the matrix I'm using, so I'm stuck with just one for the moment (can't find them ANYWHERE ELSE D: ).
So, today my PCB for the LED matrix arrived from BatchPCB! For what I paid, the PCB arrived fairly quickly - I ordered it on the 15/02 I believe, and it arrived 11/03 -- 26 days, which is pretty good (they state 19 business days).
The quality is very, very impressive - far better than anything I could pull off at home. The silkscreen and soldermask makes it look really nice, too.
Soldering it was a joy, although there was a LOT to solder and it's all surface mounted.
I had a few problems at first; it wasn't lighting the matrix at all properly but I soon realised with my new design (transistors on the cathodes) I have to write the transistors HIGH to get a LOW on the cathode, so a quick line of code changed to get that working.
Then for some reason the top half of every letter was flipped. It turns out this was my fault: I messed up when making the package for the LED matrix in Eagle, swapping the matrix's 5th cathode for my system's 8th, 6th for 7th, 7th for 6th and 8th for 5th. This was fairly easy to fix in code, however.
Finally USB isn't working to program or communicate, but I can configure the FT232RL chip (after all, it's sending the clock pulse that's driving my ATmega168). I think I have an idea of what's causing this, but I'm not sure yet.
Printed-circuit board work was conducted in Lawrence Livermore National Laboratory’s Photo Fabrication Shop. Each year, the Laboratory designed more than 250 printed-circuit board layouts and modified many existing ones. A new computer system introduced in 1977 automated their design.
After a RAM upgrade, my computer would run for maybe 30 seconds and then shut down. Same thing happened with various combinations of DIMMs installed ... even just the old ones by themselves.
I should mention that my computer was on the floor under my desk, and I had a snake-clamp lamp lighting it up. I smelled smoke and quickly learned the lamp's bulb needed to be vertical, otherwise the shade would rest on the bulb and it would smolder. Oops. So I brought the computer up above the desk where I could see it without the fire-hazard lamp.
At this point, I noticed something both odd and terrifying - when I powered on the machine, one of the wires from the PSU to the motherboard was glowing red. Meanwhile, the computer was happily booting up... until it shut itself off, and the wire faded to black.
Clearly the power supply was trash, but would the motherboard kill the next PSU? The fact that the computer would run for awhile before shutting down indicated the motherboard was not fried. I thought maybe a loose screw under the board was shorting something to ground, but I found nothing there. Nor were there any (visibly) burnt traces on the board itself.
So I decided to just swap out the power supply and cross my fingers -- and the machine has worked fine for several weeks since the incident.
Only yesterday did I decide to crack open the PSU and see if I could find any clues about what went wrong... (continued)
Electronics hobby
Designing and building a high power amplifier capable of driving low impedance (as low as 2 Ohm’s @ 50 Vpp) loads.
www.diyaudio.com/ see alias FdW
History of DIY audio
Audio DIY came to prominence in the 50s to 60s, as audio reproduction was relatively new and the technology "complex," audio reproduction equipment, and in particular high performance equipment, was not offered at the retail level. Kits and designs were available for consumers to build their own equipment. Famous vacuum tube kits from Dynaco, Heathkit, and McIntosh, as well as solid state (transistor) kits from Hafler allowed for consumers to build their own hi fidelity systems. Books and magazines were published which explained new concepts regarding the design and operation of vacuum tube and (later) transistor circuits.
While audio equipment has become easily accessible in the current day and age, there still exists an interest in building one's own equipment, including amplifiers, speakers, preamplifiers, and even CD players and turntables. Today, a network of companies, parts vendors, and on-line communities exist to foster this interest. DIY is especially active in loudspeaker and in tube amplification. Both are relatively simple to design and fabricate without access to sophisticated industrial equipment. Both enable the builder to pick and choose between various available parts, on matters of price as well as quality, allow for extensive experimentation, and offer the chance to use exotic or highly labor-intensive solutions, which would be expensive for a manufacturer to implement, but only require personal labor by the DIYer, which is a source of satisfaction to them.
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■ 세계 최대 스마트폰 시장서 모바일 사업 지속 강화
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I recently bought remote controller for PS2 from DealExtreme. But it didn't work. I thought it was bad battery, so I bought new one (in similar price as this remote, lol). And it doesn't helped. So I opened it, and quickly find the problem. It was touching wires of one capacitor. I quickly fixed it with knife, and it works at last!
Here's a little bench power supply I made using the Adafruit Power Supply kit. I just replaced the kit's PCB mount potentiometer with a panel mount pot and added a 7805 5v regulator to power the display. The acrylic panel was made from a scrap piece I had and the heat sink came from a dead PC power supply.