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Power Supply, +5 volt dc |
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This power supply is manufactured by Imation Corporation, a spin-off of 3M. This is one of the best power supply deals on Ebay. When Imation first manufactured these, they retailed at $39. The PT- 5V Power Supply is only 2" long by 1.6" wide by 1" thick. Its female connector is 1.3 mm inner diameter x 3.4 mm outer diameter (center positive). For circuit board use, this connector mates with a Mouser Electronics 161-201 connector. More often than not, though, you may want to simply cut the connector off and either trim the leads or put alligator clips on them. For prototyping use, it is a very good choice for powering your +5 VDC logic circuits. Unlike the standard wall-mount adapters, it is a full-blown SWMPS (Switch Mode Power Supply). Its input is 100 - 240 VAC. Its output is a tightly regulated 5.0 VDC, with a 1 amp (5 watt) current capability. |
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The PT-5V is different from standard wall-mount AC to DC voltage adapters in several important ways. The reason for this is that most standard units are nothing more than a large 60 hertz transformer, a couple of diodes, a fuse (maybe) and a capacitor. By comparison, the PT-5V is a higher-quality unit consisting of about 25 electronic components, including a sophisticated integrated circuit. The wall socket's AC input voltage can be anything from 100 VAC to 240 VAC, 50 or 60 herz. The circuit first converts the AC from the wall socket to DC, then switches it at a high frequency (around 150k hertz) before applying it to the transformer and regulation circuits. As a direct result, the PT-5V has a small transformer and is much smaller in physical size than most AC to DC voltage adapters. Not only that, but it puts out much smoother DC, and is more highly regulated ― functionality normally found only in full sized power supplies. Most modern applications require a well-regulated output to operate effectively, including those circuits that require +5 volt dc for their integrated circuits. These circuits usually require the +5 volt power to be within specific limits ― i.e., 4.75 volts to 5.25 volts at all times. By contrast, standard non-regulated dc wall adapters may put out as much as +9 volts when lightly loaded, and a range of other voltages depending on the current draw of the load. And many logic ICs do not operate well on the kind of 60 or 120 hertz ripple that these lower quality power supplies put out. On the other hand, the PT-5V puts out a tightly regulated +5.0 volt DC, with a 1 amp maximum capability; the output is current-limited by its electronics, even when shorted. You can leave its output shorted all day long and it will neither arc, nor spark, nor overheat - a good characteristic to have in a power supply used for circuit prototyping. This, of course, also makes it ideal for student labs. Also, whenever a standard unit is accidentally shorted, its internal fuse opens ― or, if it doesn't have a fuse, it may melt, explode, or worse, catch fire as it quits. Either way, it's done forever. (Needless to say, this type of failure can be very disconcerting to those of us who work in the electronics field; if nothing else, it causes us to do without until we replace it.) The PT-5V is built to last. After any short circuit, including a prolonged one, it pops right back into action as soon as the short is removed. |
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There are many ideal lab, workshop, and general-purpose situations in which this small SWMPS Power Supply will pay back its initial cost. Here are just a few of them (you can probably think of many more):
Student Electronics/Electrical Lab
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I've got lots and lots of these. If you need a certain quantity and a discount, let me know; I'll work with you. In order to simplify this, I've placed another item with quantity 10. |
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