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Because next Thursday is my 29th birthday, I decided to buy myself a present. :-)
God... I hope I'm making the lot of you jealous now. :-P
This is what a notebook computer looks like in 2013. It's more commonly referred to as a notebook than a laptop. The first computer that I could remember was an Intel 386 back in the late 80's in Hong Kong. I've seen the explosion of the Internet along with the rise and fall of the phone line modems peaking at 56k speeds. I remember 13 years ago when AMD broke the 1GHz barrier with their Athlon. There was a time when CPU's could just be passively cooled. The emergence of wireless Ethernet was at times painful, but welcomed. This little machine with a diagonal of 11.6" no thicker than an inch is definitely more powerful than anything that I've cobbled together with parts. Quite nice to have so much computing power in a rather small package. The next technology improvement that I'm really looking forward to is for the widespread adoption of 300dpi LCD screens.
Store closed January 2018
Austintown, OH. February 2017.
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My local Kmart will be shrinking starting in July. The store is one of supposedly 60 test stores to try a new strategy to increase sales by putting the entire store on sale.
Marshalls and other unannounced tenant(s) that will make for a 45,000 sq ft project. Interesting thing here is that the Kmart store will still be around 73,000 Sq ft rather than the 59,000 that would of been half the store. In other words, the store will still technically occupy more than half of the building.
The project is expected to be complete in Q2 next year. Hopefully this project will not turn around and cause this store to close completely as the Anderson, SC store did. Whatever happens, I'll be sure to send picture updates when I can.
Olean, NY. May 2017.
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I've finally got a grown-up camera! Say hello to my new Olympus OM-D E-M10 II.
Now I have to read the manual.
Electronics Hobby
From Wikipedia, the free encyclopedia
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"Power amplifier" redirects here. It is not to be confused with RF power amplifier.
Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]
An audio power amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.
The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio power amplifiers require these low-level inputs to adhere to line levels.
While the input signal to an audio power amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts
en.wikipedia.org/wiki/Audio_power_amplifier
History[edit]
Three audio power amplifiers
The audio amplifier was invented in 1909 by Lee De Forest when he invented the triode vacuum tube. The triode was a three terminal device with a control grid that can modulate the flow of electrons from the filament to the plate. The triode vacuum amplifier was used to make the first AM radio.[2]
Early audio power amplifiers were based on vacuum tubes (also known as valves), and some of these achieved notably high quality (e.g., the Williamson amplifier of 1947-9). Most modern audio amplifiers are based on solid state devices (transistors such as BJTs, FETs and MOSFETs), but there are still some who prefer tube-based amplifiers, and the valve sound. Audio power amplifiers based on transistors became practical with the wide availability of inexpensive transistors in the late 1960s.
Design parameters[edit]
Key design parameters for audio power amplifiers are frequency response, gain, noise, and distortion. These are interdependent; increasing gain often leads to undesirable increases in noise and distortion. While negative feedback actually reduces the gain, it also reduces distortion. Most audio amplifiers are linear amplifiers operating in class AB.
Further developments in amplifier design[edit]
For some years following the introduction of solid state amplifiers, their perceived sound did not have the excellent audio quality of the best valve amplifiers (see valve audio amplifier). This led audiophiles to believe that valve sound had an intrinsic quality due to the vacuum tube technology itself. In 1972, Matti Otala demonstrated the origin of a previously unobserved form of distortion: transient intermodulation distortion (TIM), also called slew rate distortion. TIM distortion was found to occur during very rapid increases in amplifier output voltage.[3] TIM did not appear at steady state sine tone measurements, helping to hide it from design engineers prior to 1972. Problems with TIM distortion stem from reduced open loop frequency response of solid state amplifiers. Further works of Otala and other authors found the solution for TIM distortion, including increasing slew rate, decreasing preamp frequency bandwidth, and the insertion of a lag compensation circuit in the input stage of the amplifier.[4][5][6] In high quality modern amplifiers the open loop response is at least 20 kHz, canceling TIM distortion. However, TIM distortion is still present in most low price home quality power amplifiers.[citation needed]
The next step in advanced design was the Baxandall Theorem, created by Peter Baxandall in England.[7] This theorem introduced the concept of comparing the ratio between the input distortion and the output distortion of an amplifier. This new idea helped audio design engineers to better evaluate the distortion processes within an amplifier.
Shot with 100mm f/2.8L IS USM. Crazy sharpness, colors and huge magnification (1:1, standard for macros).
Store will be closing early April 2018
Rutland, VT. October 2016.
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So here's my 2 lens minimalist Leica kit: an M7 with the Summarit-M 90mm f2.5 for telephoto shots and the Summarit-M 35mm f2.5 for a more 'normal' perspective. These Summarit-M lenses are small enough to fit inside your pocket.
Store closed fall 2017
Roanoke, VA. May 2017.
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SB800 @ 1/32 triggered via CLS through IKEA cutting board camera right.
Lumiquest tabletop reflector camera left.
Same setup as this one
商品詳細
ブランド: Leica (ライカ)
商品名: Summilux-M (ズミルックス) 35mm f/1.4 ASPH 6bit
シリアル: 4080358
マウント: ライカ Mマウント
付属品: フロントキャップ、リアキャップ、12589フード、フードキャップ、専用ケース
[商品状態]
美品：殆ど使用されていない、きれいな状態
[外観]
ピントリングにわずかに使用感が見られますが、その他非常にきれいな状態です。
塗装剥がれや目立つキズなどはございません。
詳しい状態は商品写真をご覧下さい。
[光学]
光を当ててよく見るとわずかにチリ(1-2ヶ所)がありますが、写真には全く影響の無い程度です。
[動作]
ピントリング、絞りリングともに動作は良好です。絞り羽根もきれいな状態です。安心してお使い頂けます。
MEGA-ISP shield connected to flash program into ATTiny13 MCU during prototyping of my new project.
Detailed information on this shield you may find here: http://drug123.org.ua/mega-isp-shield/
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The last photo I posted of the Kaypro 1, I expressed that I found it puzzling Kaypro ditched the "universal" motherboard that most of their computers used, in favor of adapting a new board from the Kaypro 10 model.
Well after some research it seems that as the CP/M market died, Kaypro wanted to reduce the number of cp/m machines they produced, which in 1985 consisted of the Kaypro 4, New 2, 2x, and Kaypro 10.
The 4/new2/2x all shared the same internals, minus some very minor differences in hardware (such as having or not having a real time clock, or internal modem). The Kaypro 10 used a different board than the other computers.
I guess the thinking for ditching the "universal" board for 10 style board with the Kaypro 1 was that the ten had sold well for Kaypro, and continued to sell well. While the sales of the floppy disk based systems (the 4 et al.) had fallen off considerably.
So in order to save costs, Kaypro ditched the universal board in favor of the 10 board, and created the 1.
This actually almost makes the "1" model name make sense because it's more in line with "10" and the "1" replaced several models, with just 1 model.
Some contemporary literature mentions Kaypro working on or released a Kaypro with one disk drive, that would list for $995. I think that these statements are probably all incorrect, and the people writing them probably were refering to the Kaypro 1. The Kaypro II was called the II because it had two drives- so industry writers may have mistakenly thought the Kaypro 1 would be released with only one disk drive, going by the name. Or other simple miscommunication between Kaypro and the press about the 1 could have lead to the exact same mistake.
Although the 1 had just been introduced for 1986 and took advantage of Kaypro 10 parts... Kaypro also announced in 1986 that production would be ceasing on the 10! They also stated the 1 would be dropped and the 2x would be brought back... despite the announcement apparently Kaypro realized how silly this would be, and the 2x was never brought back. The 1 became the sole cp/m offering from Kaypro in 1987, and production of all kaypro portables (including the MS-DOS 16 and 16/2) ceased later that year.
Dickson City, PA. June 2015.
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Old Pentax, pic taken using lens from "Retro 1", spot the difference in IQ between the two shots.
I bought this (including the classic and immaculate lens) for £30 from a car-boot sale :-)
Sunflex IV TLR
Japanese 6x6 twin-lens reflex camera.
Viewing lens: Elnor Anastigmat f/3.5 75mm, sn #16327.
Taking lens: Elnor Anastigmat f/3.5 75mm, sn #16267; f/3.5 - f/22
Shutter: Nippon Kōsokki NKS-SC rim-set shutter (B, 1-200).
Body serial: no body serial number can be found.
Manufacturer: Tōkyō Kōgaku Kikai K.K.(東京光学機械㈱,Tokyo Optical Comany, later Topcon).
Weight: 905 grams
Production: Quantity unknown
Era: early 1950s.
Rarity: Extremely rare (****)
The camera is in near-mint condition.
© Dirk HR Spennemann 2012, All Rights Reserved
Towanda, PA. October 2017.
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