View allAll Photos Tagged electronics.
These displays are all new for my Walmart.
My local Walmart recently under went a slight remodel in adding new signage as well as a slight rearrangement in aisles for some departments. I figured I'd take some photos of all the new sights. Pictures of the old arrangements can be found in the same album.
---------------------------------------------------------------------------------------------
If you would like to use THIS picture in any sort of media elsewhere (such as newspaper or article), please send me a Flickrmail or send me an email at natehenderson6@gmail.com.
This is the Synte 2 processor board. It contains an MC6800 microprocessor, two 2Kbyte EPROM chips, two 128 byte RAM chips and two MC6821 I/O interface chips. The clock frequency of the processor is 1 MHz (the big metal component is a crystal oscillator).
Electronics Technology
Front row L to R: High School medalists—Silver-Matthew A Dickson, Auburn Riverside High School (Wash.); Gold-Zachary Snyder, Warren County Tech School (N.J.); Bronze-Chelsie Cloutier, Orleans Career & Technical Education Center (N.Y.). Back row L to R: National Technical Committee Member Phillip Kevin Gulliver; Postsecondary/ college medalists—Silver-Jordan Steidinger, State Technical College of Missouri (Mo.); Gold-Cody Leahy, Fox Valley Technical College (Wis.); and Bronze-Josiah Duff, College of Western Idaho (Idaho)
swimwear, speedo, tyr, nike, splish, dolfin, grabbag suits, swim cap, lane rope, parka, kickboard, water polo, swim fins, hand paddles, swim goggle, swimsuit, lifeguard, bikini, triathlete, goggle, fins, swimming, coach, team sport, individual sport, recreation. all this and more @ djsports.com
Macro of some 'old school' electronics, meaning pre-surface mounted devices and computer chips. Circuit board from an old battery backup emergency light.
Former Caldor/Kmart
Target Salem MA
- Opened July 23, 2003
- Last New England Target with P01
- Target Greatland Style Layout
- P04 Prototype Exterior
- 97,000 Square Feet
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.
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.
This series of images will guide you through modifying an HS-311 servo to give continuous rotation in either direction, with a degree of speed control.
The modification is non-reversible, but these servos are cheap as chips so this shouldn't be a big worry.
Seen Here: The PCB out of the bag! (Torch see-through vision!)
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
From Wikipedia, the free encyclopedia
Jump to: navigation, search
"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.
Christmas in June! I bought a used Tektronix 475A oscilloscope online and it arrived today! Here it is, newly unwrapped, with Mrs. W's finger for scale.
It looks very Scientific, doesn't it? Oscilloscopes are diagnostic tools used to show electrical behavior in circuit guts, so they're de rigueur for serious electronics hobbyists. And I could forgive people for thinking scopes are necessary for software development, too, if they've seen one too many ITT Tech commercials.
This o-scope is a bit of a monster, weighing about 30 pounds, and it was probably built about 30 years ago. (Wikipedia's article about oscilloscopes mentions this very model in a sidebar, describing it as "a very typical instrument of the late 1970s".)
I used scopes very much like this one in college in the eighties. They were built to last and I've read that they're very tolerant of the sort of mistakes made by beginners. I used to know how to use one, and was able to remember enough, after a bit of fiddling, to show the pattern output by the front panel probe calibration lug (next picture) but I expect to spend many happy hours learning what all those buttons and knobs do.
Perhaps best of all, this one has the word RADIATION stenciled on the storage bag. I hope that doesn't mean it's radioactive. Possibly my next purchase will be a Geiger counter.
---------------------------------------------------------------------------------------------
If you would like to use this picture in any sort of form, please send me a Flickrmail or send me an email at natehenderson6@gmail.com.