![]() This makes construction a chore, so I decided to settle for the multiple-LED lamp, which works very well. You could also build a multiple-neon lamp, but the lamp firing voltages are different enough that individual current limiting resistors must be selected for each lamp. ![]() This lamp operates from a 12V AC wall transformer and the “bars” are much clearer than with an incandescent light. As you can see, the circuit is simple and the wiring is not at all critical. A circuit diagram with parts lists follows in Fig. You can use a neon “nightlight” (Photo 6), but it’s rather dim so it’s not too useful unless the room is dark! Better lamps are available.įor my use I built a multiple-LED lamp (Photos 7A and 7B). Neon lamps and white LEDs operating on AC power work well because both produce pulses of light even though your eyes can’t really see the pulses, at least not with 60Hz power. You can see the stationary appearing bars, but their edges look fuzzy, so it’s difficult to set the speed “right on.” ![]() The published specifications note that the speed accuracy can be measured to 0. The phosphor coating on the inside of the tube continues to radiate light between the AC power cycles. It covers the following speeds: 16.66, 33.33, 45, and 70.59 to 90 RPM in 15 bands. If you synchronize the strobe speed with the fan speed, you can freeze the pattern. Now switch off the room lights and switch on a strobe light instead (bottom). As the fan spins, the patterns blend into a single moving image. The filament does not cool very much between cycles of the AC power so the light output is rather constant. You put a series of changing patterns, printed on a circle of cardboard, on the front of a rotating fan. Incandescent lamps (ordinary light bulbs with a filament) work, but not too well. Figure 1 shows an example printout from strobo.exe: the outside diameter of the bars is over 7", which makes it easier to see whether the bar edges appear stationary. The zip file, strobe.zip, contains both executable programs with documentation. It will print up to five strobe bands on a single sheet but the bars are a bit “jagged.” Both programs are available for free from several websites, including the TDL site(5). high contrast black markings on silver disc made in Japan 'The AT6180a stroboscope enables you to check the rotation speed of your turntable. There are two public domain programs: one is named strobe.exe and it’s an MS-DOS program which will run under Windows. These days it’s not necessary to buy a stroboscope disc if you have a computer, because you can easily print your own for any speed and for either 50 or 60Hz power. It automatically captures the last speed, the maximum speed, and the minimum speed. The corresponding radial appears to be perfectly still if the record player is working just right. Place the disc on your turntable, apply direct light and set the platter spinning. After a ten-minute or so turntable warmup, press the DIGIstrobo’s memory store button. On a stroboscopic disc, concentric bands of radial squares each correspond to a speed on your turntable 33.3, 45 and 78 rpm. You can also use the device to measure speed stability. You can check the speed while playing a record if you provide something for the DIGIstrobo to “see.” A small piece of reflective tape on the turntable edge will work, and a supply of tape is furnished with the unit. The published accuracy is ☐.05% (or 0.1 RPM). Typical order times are located within the product description.Hifi4music(4) markets the DIGIstrobo, which is a rotational speed measuring device adapted to audio use that is, it directly reads and displays the turntable speed so it can be used for all records from 33 1/3 to 90 or higher RPM. It is not guaranteed.Ī Special Order item is an item that we do not stock but can order from the manufacturer. When an item is Out Of Stock and we have an estimated date when our stock should arrive, we list that date on our website in the part's description. We do not have a specific date when it will be coming.Īwaiting repress titles are in the process of being repressed by the label. The Preorder can be released anywhere between weeks, months or years from its initial announcement.Īn Out Of Stock item is an item that we normally have available to ship but we are temporarily out of. Theory: The primary use for a stroboscope is to stop motion for diagnostic inspection purposes. Use the Stroboscope to quickly check to see if your turntable is running at the correct speed and use the Tracking error guage to make sure that your cartridge and needle are properly aligned. Other Preorders are set to release 'TBA.' This means that release date is yet 'To Be Announced'. Objective: To measure speed by usinh Stroboscope. Here are your Free Turntable Speed Disk and Tracking Error Gauge Downloads. ![]() If a projected release date is known, we will include this in the description in red. Typically the label will set a projected release date (that is subject to change). An In Stock item is available to ship normally within 24 business hours.Ī Preorder is an item that has not yet been released.
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