Turntables for Sale

Turntable Light

physics help i need answers!!! veeryy confused?

A turntable that turns 12 revolutions each second is located on top of a mountain. Mounted on the turntable is a laser that emits a bright beam of light. As the turntable and laser rotate, the beam also rotates and sweeps across the sky. On a dark night, the beam reaches some clouds 8 km away.
(a) How fast does the spot of laser light sweep across the clouds?

(b) How fast does the spot of laser light sweep across clouds that are 16 km away?

(c) At what distance will the laser beam sweep across the sky at the speed of light (the speed of light is 300,000 km/s)? (In Chapter 15 we will learn that no material can travel at the speed of light; here we have a nonmaterial spot. Not only can it travel at the speed of light, at greater radial distances the nonmaterial spot can travel faster than the speed of light!)

C = Pi * D
C = Pi * 16 km = 50.27 km

It sweeps that distance 12 times a second

12 * 50.27 = 603.19 km /s (That's a)

Do it again for b

300,000 / 12 = 2500 km We need a circumference that distance

2500 = Pi *d

d = 2500/Pi = 795.77 km ===> Radius = 795.77/2 = 397.89 km That's c

It still takes 397.89 / 300000 = 0.013 s for a photon to get from the laser to the screen. The dot is just a dot. It may even strobe so you could see individual photons strike the screen, depending on the rate at which photons leave the laser, with a dark spot between photon hits. What the book is telling you is that the dot has no mass so it is not constrained to move at less than the speed of light.

Think of it like a machine gun that fires 100 bullets per second @ 500 m/s shooting at a circle of targets 1 km away (1000 m). The gun spins 1 revolution in 1 second and fires 100 rounds. Now load the gun with 1000 rounds and let it fire for 10 seconds. How fast are the bullet holes moving across the targers? What is the velocity of each bullet? Starting at time = 0 the last bullet fires at t = 10s. When does the last bullet hit the last target? Think about it. It should make more sense.

HINT: Does spinning the gun change the velocity of the bullets?

Stanton Turntable STR8-150 HP $499 Stanton Turntable STR8-150 HP In creating the ST.150/STR8.150 Stanton went back to basics and re-engineered everything. These "no nonsense" turntables have everything professional DJs need and nothing they don't. That's why the ST.150 (standard S shaped tone arm) and STR8.150 (skip-proof straight tone arm) are built first and foremost with quality in mind. Both models offer durable construction designed to minimize feedback, industry-leading torque motor - up to 4.5 Kgf-cm, and an ultra-stable platter and tone arm. And with features like Key Correction, Reverse, up to 50% pitch adjustment, and S/PDIF digital outputs - the ST.150 and STR8.150 are strong contenders for the title of Turntable Supreme. Features: Start/Brake Speed Adjustment Digital Output [S/PDIF] Plug straight into CD-R or computer sound card Key Correction Selectable Phono or Line Output (Key correction works on line output only) Dual Start/Stop Buttons Height Adjustable Tone Arm Reverse Play 3 speeds [33,45,78] Quartz Lock Selectable pitch control [+/-8%,+/-25%,+/-50%] Motor Off Feature Removable Target Light Adjustable Feet Includes slipmat and "L" shaped cables Includes Stanton 680HP cartridge mounted on headshell Get Your Stanton Turntable STR8-150 HP Today!

Stanton Turntable ST-150 HP $499 Stanton Turntable ST-150 HP In order to satisfy both analog purists and technology-heads the 150 Series turntables are hybrids of analog and digital technology. When using the phono output the signal remains in the analog realm from the pick-up to the output. The line output however gives access to the on-board high quality digital key correction feature. A strong motor and high-end technology coupled with a heavy duty steel body, the 150 series turntables are truly the strongest and most durable turntables ever created. Features: Super High Torque Direct Drive Motor [4.5 Kgf-cm] Height Adjustable "S" Shaped Tone Arm Start/Brake Speed Adjustment Dual Start/Stop Buttons Key Correction Digital Output [S/PDIF] Selectable Phono or Line Output Reverse Play Quartz Lock Up to 50% Pitch Control Motor Off Feature Removable Target Light Includes Headshell, Slipmat, all Cables and Stanton 680HP Cartridge Heavy Duty Steel Faceplate Get Your Stanton Turntable ST-150 HP Today!

Gemini TT-2000 Direct Drive Turntable $149.95 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini Tt-2000 Direct Drive Turntable $149.95 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Turntable Matinee $10.49 Turntable Matinee

Turntable Technology $9.49 Turntable Technology

Gemini TT-2000 Direct Drive Turntable 886830232503 $112.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830232510 $127.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830254192 $74.98 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830035999 $127.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830038440 $74.98 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830072345 $112.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 886830223150 $74.98 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 889406753211 $127.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 889406469686 $112.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 889406562042 $127.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 889406753266 $112.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Gemini TT-2000 Direct Drive Turntable 889406599802 $127.46 The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.High-torque, direct drive turntableBattle- and club-style design+/-10% variable pitch sliderSolid aluminum platterFully adjustable counter weight & anti-skating controls33 and 45 RPM, reverse playback capabilityDual soft touch start/stop buttonsMotor Off button for slower brakingRemovable target light (not included)Includes:HD-15 headshellCN-15 cartridge45 adapterFelt slipmatDetachable RCAGround cables

Ben's Light Triggered Rotary Sequencer

How to Increase Your Online Sales With 360 Degree Product Views

Running a website selling physical products?

If you are selling with product images there is a way of dramatically boosting your sales, reducing returns and making your site a bit special - 360 degree product views!

The whole point of a product image is to show your visitors what the product looks like, right? So if you are proud of your products (and want more sales) here is how to show more than a boring photo...

What You Need (Equipment)

Your camera - a basic point and shoot digital camera might work but realistically you will need a camera with some manual adjustment features. You will also need a tripod or something similar to hold the camera steady between shots.

Next up is a turntable of some sort. It does not need to glide smoothly on oiled bearings, simply marking your floor and a round, flat surface that you can rotate to line up with your markings, should work. Note that it is much easier to rotate the product than the camera!

The final thing you will need is some form of software to help stitch your images together into a 360 product viewer based on Adobe Flash or Java technology, or knowledge of JavaScript so you can display them sequentially on your website. Probably the easiest way of doing this would be a "slide show" arrangement, where your images are displayed one after the other. If your setup allows your visitor to move back and forth in the slide show, all the better.

Get Focused

The biggest issue with the 360 degree product photography is poor focus.

Simply focusing on the object may not work well, as typically you will find that when shooting close-ups that only one part of the product is in focus, with anything a bit nearer or further looking soft or mushy.

You can not get away with that for 360 degree photography, so here is what to do:

First, if you can, switch your camera to manual focus, not auto. If you can change lenses, go for a "standard" lens, somewhere between 40mm and 60mm. A wide angle or zoom can distort the perspective, which again you can't get away with when rotating the product, as your product will be stretched and bent as it rotates. The trick to getting your entire product in focus at once, especially smaller products, is changing the size of the aperture.

Aperture and Depth of Field

The higher the number, the smaller the aperture and you need to go as small as possible. For example f22 is much smaller than f2.8. Note that depending on the lenses if you go far beyond a certain f number, you will start to see a drop in sharpness of your photos, so you will need to experiment. Look for a setting with "f" in it, or turn the dial to "AP" ("aperture priority").

The downside of a small aperture is you'll need a slow shutter speed, but if your camera is fixed on a tripod that's not a problem. Though you will still need to setup bright lighting. If you can keep the exposure time to less than half a second (0.5) generally you should be ok.

Look for a depth of field preview button on your camera though note that even some expensive cameras don't have this capability. It may be marked DP or DOF - but be aware on some consumer cameras DP stands for Direct Printing! While pressing the DP button, manually focus until the entire product is clear and sharp.

Don't forget your focus must be perfect at every angle - double check!

Lighting

Daylight is your brightest source and it's free, but realistically you will need a setup with at least two light sources. Go for 6500K daylight bulbs and position the lights such that the shades are minimal. You might need some form of light diffuser to prevent bright reflections and hard shadows.

Obviously at WebRotate 360 we use professional studio lighting but you can get similar results by experimenting with the setup of your lights and your camera settings.

Your Turntable

Something such as a round foam board or similar will work, perhaps coated or covered with something attractive but non-reflective. Ideally it should be perfectly round, and secured in the exact center, such as with a bolt through it. Mark around it with a marker pen or similar. From there, draw lines directly across the center, extending out beyond the diameter of the turntable onto the floor or whatever surface you are using. Make sure the lines are evenly spaced. You do not need 360 lines, each signifying one degree, in fact you can get good results with just 20 or so. Mark the turntable itself, on the very edge, to match those markings.

Now you just need to rotate the table around one mark at a time, take a snap, and repeat!

Your End Result

Presuming you have done everything correctly, you should end up with a series of 20 or more crystal-sharp images, of a brightly lit yet non-reflective nature, without hard shadows or anything noticeably inconsistent from one shot to the next.

If so, well done! If not, start again - it may take a few attempts but it's worth doing well.

The pay-off is that if it is done well you give your visitor a much more intimate and detailed view. They will see your offering from every angle, leaving no doubt as to their desire to own and possess it. This makes it much easier for them to make a buying decision than what you can ever achieve with a single, static photo!

I told you earlier than this can reduce the number of returned goods. At WebRotate 360 we have found clients of our 360 degree images reported a reduction in return rates of 30% or more. It also reduces your workload, with fewer tire-kicking enquirers.

Your Bottom Line

360 degree images do require some careful setting up and experimenting but if done properly the rewards are worth it.

If you would like the end result, without the hassle, contact us at http://www.webrotate360.com.
As well as professional 360 photography we offer specialized fast-loading 360 degree viewer software for your online product showcase, 3D modeling services, plus we can help you with the website integration or even host your 360 degree views for you!

About the Author

My interests: 360 degree views/3D modeling, photography, marketing, software development, arts, history.

Comments are closed.