| Product Description: | A nice aluminum dual head general purpose stethoscope that lets you do most common things. Adult size: 1.75 inch diaphragm on one side, 1.15 inch on the other. Freely rotates around its tubing spigot to switch between one side or the other. Large diaphragm active one way, rotate it 180 degrees and use the small side. Available in a wide variety of colors: red, green, blue, black, gray, teal (a darker green with a little blue component) and pink. Let us know in the comment section what color you prefer (first and 2nd choice). Shipped in box.
| Electrical neuromuscular stimulator (Tens unit) - Energiser MS3000 neuromuscular stimulator, fixed 250 microsecond pulse width, adjustable in frequency from 2 to 120 Hz, with the additional option to ramp it up and down on top of that with a period adjustable from 1 to 8 seconds, or sinusoidally cycle with a period between 1 and 30 seconds. Each unit has two outputs to control two independent connections through 4 electrodes. Virtually identical to another model of TENS unit (click here), which we also have.
Dual channel (2 independent outputs)
Uses one 9-volt battery (included)
Pulse width 250 microseconds fixed
Pulse rate: 2 to 120 per second, adjustable
Output type: constant current during pulse
Current output: 0 to 80 mA, adjustable
Battery life: 70 hours
Weight: 5 ounces with battery
Extra features: 1 to 30 second cycle wave in intensity, adjustable.
1 to 8 second cycle linear on-ramp, adjustable.
| The data sheet is here. Manufactured by National Semiconductor, this 16 pin DIP TTL chip has 4 positive-edge triggered D flip-flops, with true and complemented (inverted) outputs. All 4 have a common clock connection to save pins, and all 4 have a common 'reset' pin, which when held low, sets all the stored values in the D flip-flops to 0 (low). It is a member of the "fast" TTL family. Rather than "LS" or "ALS". It is as you would expect - this means it is fast. The data sheet says it is guaranteed to be fast enough to switch states with a clock frequency of 100 MHz, but what is typical is 140 MHz.
For sheer utility for screwing around with digital electronics, this is probably the best chip to buy, even more than nand gates, I'd say. The need for these simply comes up more often than logic gates, and you quite plainly can do more neat things with them using fewer chips than anything else, I'd say, but it of course depends on what you have in mind to do.
| High brightness red LEDs. Clear, undiffused 5 mm lens, 500 mcd (120 millilumens) at 20 milliamps over 40 degree viewing angle, 20 degree half-power angle. Forward voltage 1.8-2.2 volts, wavelength 637 nm, spectral line half width 20 nm. $0.15 each in bag of 20 or $0.12 each in bag of 100. Contact us regarding low cost 1st class shipping alternatives. Medworth@gmail.com to discuss. #RED-500-20
| Standard replacement inflation bulb for a 2-tube sphygmomanometer. The aperture of the rubber bulb is about 1/4 to 5/16 inch, with metal intake value. It does not include the air-release valve that fits into the open hole on the bulb. If you have noticed a leak in your old bulb you can easily replace it with this dark blue soft latex-free PVC material. The advantage of this material is it won't decompose on you as the years go by the way rubber will. Be sure to check your inflation system as those may develop leaks over time as well.
| Lumiscope (Labtron) brand single-head stethoscope and sphygmomanometer BP monitor kit. This set allows you to spend the least amount of money to let you take blood pressures. This home blood-pressure kit fits neatly into a nice little zipper case. Black tubing on the stethoscope, zipper case is black soft imitation leather. The sphygmomanometer contains latex in the bulb and the bladder (inside the cuff) but the stethoscope is latex-free. We are selling this as an inexpensive set to meet a single need - taking a blood pressure. Nothing fancy. If you are looking for more professional instruments, they are also available from our company.
| Microcontroller clock kit. The picture shows the 8031/8051 dice clock, made with the 8031 microcontroller, but aside from the fact that this uses one PIC16C57 and has 15 independently settable alarms instead of just 3 (and so there are 4 LEDs for RS3 through RS0, not just RS1 and RS0), this clock behaves in the exact same way. Contents are 49 LEDs, one programmed microcontroller, one 4-MHz crystal, 18 resistors, 2 capacitors for use with the crystal, an electrolytic capacitor, a 5-volt voltage regulator, 2 PNP transistors, 2 diodes, one miniature speaker, 2 pushbutton switches and a copy of the wiring diagram, which is also here:
http://www.medexamtools.com/clock.htm
A demonstration of this clock can be seen here (make sure to RIGHT CLICK on this link and tell it to save rather than left click to just open, because otherwise sneaky old mediafire will probably just redirect you to an ad):
http://www.mediafire.com/download.php?y95ga58oj4gl1fy
| Mabis Catalog No. 25-779-000, German made, Lifetime warranty. Additional savings for quantity purchases. Please be aware there are important differences between ECG Calipers. We have had people buy the cheapies and come to us at the last moment because they needed quality. These are precision made. Sharp points with point cover. Beware of Imposters!
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