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Seen Here: The PCB out of the bag! (Reverse side)
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.
Electronics Hobby
Building a new components-cabinet.
Hacker (hobbyist)
In home computing, a hacker is someone who modifies software or hardware of their own private computer system. It includes building, rebuilding, modifying, and creating software (software cracking, demoscene), electronic hardware (hardware hacking, overclocking, modding), either to make it better, faster, to give it added features or to make it do something it was not originally intended to do. Hacking in this sense originated around hobbyist circles discussing the MITS Altair at the homebrew computer club.
Hacker artists[edit]
See also: Fractal art, algorithmic art and interactive art
Hacker artists create art by hacking on technology as an artistic medium. This has extended the definition of the term and what it means to be a hacker. Such artists may work with graphics, computer hardware, sculpture, music and other audio, animation, video, software, simulations, mathematics, reactive sensory systems, text, poetry, literature, or any combination thereof.
Dartmouth College musician Larry Polansky states: "Technology and art are inextricably related. Many musicians, video artists, graphic artists, and even poets who work with technology—whether designing it or using it—consider themselves to be part of the 'hacker community.' Computer artists, like non-art hackers, often find themselves on society’s fringes, developing strange, innovative uses of existing technology. There is an empathetic relationship between those, for example, who design experimental music software and hackers who write communications freeware." [3]
Another description is offered by Jenny Marketou: "Hacker artists operate as culture hackers who manipulate existing techno-semiotic structures towards a different end, to get inside cultural systems on the net and make them do things they were never intended to do." [4]
A successful software and hardware hacker artist is Mark Lottor (mkl), who has created the 3-D light art projects entitled the Cubatron, and the Big Round Cubatron. This art is made using custom computer technology, with specially designed circuit boards and programming for microprocessor chips to manipulate the LED lights.
Don Hopkins is a software hacker artist well known for his artistic cellular automata. This art, created by a cellular automata computer program, generates objects which randomly bump into each other and in turn create more objects and designs, similar to a lava lamp, except that the parts change color and form through interaction. Says Hopkins, "Cellular automata are simple rules that are applied to a grid of cells, or the pixel values of an image. The same rule is applied to every cell, to determine its next state, based on the previous state of that cell and its neighboring cells. There are many interesting cellular automata rules, and they all look very different, with amazing animated dynamic effects. 'Life' is a widely known cellular automata rule, but many other lesser known rules are much more interesting."
Some hacker artists create art by writing computer code, and others, by developing hardware. Some create with existing software tools such as Adobe Photoshop or GIMP.
The creative process of hacker artists can be more abstract than artists using non-technological media. For example, mathematicians have produced visually stunning graphic presentations of fractals, which hackers have further enhanced, often producing detailed and intricate graphics and animations from simple mathematical formulas.
en.wikipedia.org/wiki/Hacker_(hobbyist)
Feeding a variable voltage into an LM317 variable linear voltage regulator. PWM from Arduino is filtered/converted to an analog signal, which is then buffered and amplified by op-amp (LM358), which then feeds it's output into LM317. This lets me use a PWM pin on an arduino to control the LM317 from about 2V to about 9.5V.
It's not very efficient (particularly on low voltages), but it should hopefully work well for controlling Marklin z-scale train, as we get a true voltage (rather than PWM).
Though it's not finished (the wall), and it's nice that they kept the signage they already had at this time, they got around to moving Electronics to their new area. Exciting!!!! My friend, Joe took this picture for me because he happened to be in this Target at the time. This visit was 1/18/11.
This is a test circuit I cobbled up today to try out an Optrex DMF5005N graphic LCD display.
Here you can see how what is a nice neat ribbon cable / IDC arrangement on the display side becomes a horrible Cthulhu-beard of wires at the breadboard side. Each ribbon cable conductor is a stranded wire, i.e., a collection of hair-fine wires that would be hopeless to stick in a breadboard socket, so I tinned all of them with a drop of solder to stiffen them up. The result? The technique worked, but I can't really recommend it. In fact, I anti-recommend it. It's a lot of fiddly work to tin the wire ends, and it would be very easy to break them off in the breadboard. When I get past the driver prototyping and get around to using the display in a real project, I'll figure out a nicer way to interface it.
As you can see from the rat's nest on the breadboard, wiring a display like this takes a lot of signal paths - it used all but two of the I/O pins on the ATTiny861 MCU, so that chip is not a great choice for this LCD if you mean to do any chattering with any other peripherals. The data lines could be shared, but I don't like the kind of juggling you have to do for that if you can instead just use a chip with more I/O lines - and as it happens, I have several of them. I chose the Tiny861 for this test because it's a very easy chip to debug in-circuit using the Development Environment of Kings. That came in handy for this projecteen because my code did have a bug in it which the in-circuit debugger helped me track down. Yay!
My goal for today was to get this display to show a checkerboard pattern of 8x8 pixel squares. I pulled it off! Fancier stuff can come later - a large fraction of the effort for projects like this is to get the circuit to do anything at all, and once that's going, the rest is relatively easy.
A cute little VOM in a black bakelite case. These were pretty popular in Canadian high schools like the LSG 10-A, hence, they are everywhere.
Have an electrifying weekend.
Please don't comment with (blinking or self-promoting) images.
And please respect the copyright on the photos in my photostream.
Seller said it was from a Mig aircraft... I say no, not aero design, and too heavy... it rather seems to be a stackable box, so probably a part from something bigger... Not from a ship or submarine, because it's not the regular navy color and not moisture resistant... maybe it's from a mobile radar or radio relay system... Led bulbs says "Defect" (Avaria) with which "module" is defect (sub-block) and also if the status is "Normal" (Norma). Switches are for "Address" "Test" and "Power". Quite happy with the item, it is exposed in my living room !
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.
Consumer Electronics Apple iPhone Distributor Samsung Mobile Phones
Undoubtedly, many electronic consumers are interested to use good mobile devices for their use. Most of the people are using brands such as iPhone devices and Samsung mobile phones for their use. Consumers consume electronics devices if they are getting what they need at a good price, with good features. Apple iPhones and Samsung mobile phones distributors have an easy process to sell their brand products because they feel that to invest in a product which is easy to sell by its brand’s name then this is the best thing to do.
GlobalGeeks has services for both electronic consumers,
whether they want to buy Apple iPhones or Samsung phones. This not only provides you with the best services for being their customer, but you will get optimize products quality with best facilities. These smartphones have been sold by many other companies, few have Samsung devices, few have Apple iPhone’s distributorship, maybe it has become little tough to decide which is good to buy by comparing them. If you visit a distributor who has both of the devices, then it might be easy to purchase the best suitable mobile phone for you by comparing all of the latest available devices.
Consumer Electronics Apple iPhone Distributor Samsung Mobile Phones
This is itself a big task to have the distributorship for two big brands of the world, Apple iPhone and Samsung mobile phones. It has more things rather than to invest a huge amount into it. This proofs that GlobalGeeks can manage or run two big brands distributorship so that it could reach out to the people easily. This is also a good ideology for the consumers of electronic gadgets, who love buying the latest phone available with the new latest feature. If you want to buy the best and latest electronic devices for you, then you are at right place. Just give us a call and get to know more details about your favourite devices.
This is one of the themed stores for Fry's Electronics. UFO Theme. Based off of the Mars Attacks book.
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.
Embedded Electronics Starter Kit from GHI Electronics
FEZ Spider Starter Kit
www.ghielectronics.com/catalog/product/297
FEZ Spider Starter Kit is the first commercially available .NET Gadgeteer-compatible kit. it includes everything necessary for educators, hobbyists and even professionals. Embedded development is fast & easy (FEZ) thanks to .NET Micro Framework, .NET Gadgeteer and the numerous GHI value added features such as WiFi and USB Host.
The kit includes:
FEZ Spider Mainboard
Display T35 Module (3.5" with touchscreen)
USB Client DP Module (with USB cable)
Camera Module
2x Multicolor LED Module (DaisyLink)
2x Button Module
Ethernet J11D Module
SD Card Module
USB Host Module
Extender Module
Joystick Module
10cm IDC cables (included with modules).
Assorted IDC Cable Pack:
4x 5cm IDC cables
3x 20cm IDC cables
1x 50cm IDC cable
Reusable Plastic Storage Box
FEZ Spider Mainboard is a .NET Gadgeteer-compatible mainboard based on GHI Electronics' EMX module. This makes FEZ Spider Mainboard the most feature-full .NET Gadgeteer compatible device in the market. It contains all of .NET Micro Framework core features and adds many exclusive features, such as USB host, WiFi and RLP (loading native code). All these features combine to provide a rapid prototyping platform.
Key Features:
14 .NET Gadgeteer compatible sockets that include these types: X, Y, A, C, D, E, F, H, I, K, O, P, S, T, U, R, G, B and Z.
Configurable on-board LED
Configuration switches.
Based on GHI Electronics EMX module
72MHz 32-bit ARM7 processor
4.5 MB Flash
16 MB RAM
LCD controller
Full TCP/IP Stack with SSL, HTTP, TCP, UDP, DHCP
Ethernet, WiFi driver and PPP ( GPRS/ 3G modems) and DPWS
USB host
USB Device with specialized libraries to emulate devices like thumb-drive, virtual COM (CDC), mouse, keyboard
76 GPIO Pin
2 SPI (8/16bit)
I2C
4 UART
2 CAN Channels
7 10-bit Analog Inputs
10-bit Analog Output (capable of WAV audio playback)
4-bit SD/MMC Memory card interface
6 PWM
OneWire interface (available on any IO)
Built-in Real Time Clock (RTC) with the suitable crystal
Processor register access
OutputCompare for generating waveforms with high accuracy
RLP allowing users to load native code (C/Assembly) for real-time requirements
Extended double-precision math class
FAT File System
Cryptography (AES and XTEA)
Low power and hibernate support
In-field update (from SD, network or other)
Dimensions: W 2.25" x L 2.05" x H 0.5"
Power
Low power and hibernate modes
Active power consumption 160 mA
Idle power consumption 120 mA
Hibernate power consumption 40 mA
Enviromental:
Requires .NET Gadgeteer standard red power modules.
RoHS compliant /Lead-free compliant
Most EMX software features are GHI exclusive, see software documentation for details.
For more information about .NET Gadgeteer visit:
Photograph taken by Michael Kappel
Burra Bazaar area, Kolkata.
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Taken with a Pentax MX, Pentax 50mm f/1.7 lens with Fuji Xtra 400 consumer film.
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.
* Electro Harmonix 12AU7
* Solen MKP input capacitors
* Nichicon Muse output capacitors
* Alps stereo volume control potentiometer
The PCB layout has been heavily modified since I built my prototype: added a ground pour, fatter traces, an extra mounting hole. Had to get the digital calipers out to measure my tube socket and make the component in Eagle. It has been hard work, with a huge amount of learning on my part. Sound is amazing, tho :)
This photo shows everything tucked away for storage. That tube section on the right slides out and then opens. If you look at the other photos carefully, you'll see what I mean.
Seen Here: The PCB with the chips in place.
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.