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■ ‘유니세프와 함께하는 물 드림 프로젝트’ 통해 휘센 제습기 구입고객 이름으로 물 부족 국가 어린이에게 총 30만 ℓ 기부
■ 김제훈 한국AE마케팅담당 “향후 새로운 고객가치를 제공하는 제품은 물론 차별화한 마케팅 활동을 지속 강화할 것”이라고 강조
※ Social LG전자 (social.lge.co.kr/newsroom) 에서 관련 보도자료를 확인하실 수 있습니다.
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.
Seen Here: The PCB assembled: Hello, World!
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.
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.
Just testing the new toy I found with almost 70% off at the winter discount sale. Lots of possibilities but much more complicated than my old Coolpix !
Have an electrifying weekend.
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Seen Here: The PCB out of the bag!
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.
This is one of 7 pictures i took of shopko that i forgot i had. This is a picture of the electronics section at shopko
TWI has been actively involved in the development and testing of electronic devices and sensors for over 40 years, helping Members to produce cost-effective, reliable products and solutions by providing authoritative advice and guidance on materials and process selection, prototyping and production line troubleshooting.
For more information www.twi.co.uk/industries/electronics-and-sensors/
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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.
■ NCAA 농구 챔피언십에서 울트라HD TV로 스포츠 마케팅
■ 팬 축제 행사장 ‘브래킷타운’에 울트라HD TV, 생활가전 등 전시
■ 일반 가정집 같은 전시 구성으로 편안한 체험 환경 제공
※ Social LG전자 (social.lge.co.kr/newsroom) 에서 관련 보도자료를 확인하실 수 있습니다.
* 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 :)
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.
The three units on the left are channel units. Thick wires lead to each phone, thin wires lead to each analog phone line outside of the office. The other two modules are for control, voice mail, etc.
The chassis is modular, so you can plug more units as needed.
Model 604 HSR panel meter 0-50 volts DC. This is a quality meter of the type you see on the TV-7 tube testers. Found this in a electronic surplus store in Toronto.
For Sale - TOSHIBA true Flat screen 32" TV (CRT - not LCD or Plasma). Remote control included. Antenna/Cable/Sat, S-Video and Composite Video inputs in the back. Additional S-Video and Composite Video inputs in the front as well. Speakers built-in. Silver finish. Screen is truly flat and measures 32" diagonally.
In Excellent Condition. Bought 4 years ago. Excellent for TV viewing or gaming. Asking $165 or best offer. Pickup only. Pl call 734.674.6868.
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.
Thanks to all who brought their no-longer-needed electronics to our drop-off recycling event at Walt Whitman High School on November 4, 2012, and to the staff and volunteers who supported the afternoon.
Details about our electronics recycling program:
www6.montgomerycountymd.gov/apps/dep/solidwaste/collectio...