Comair Rotron Muffin XL MD48C6 Series Fan with TachometerSold By Kevin H. Patterson, Ships from United States of America
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This fan is a high-quality 48V brushless DC fan made by Comair Rotron. These fans are NEW in box, but come from surplus stock with a manufacture date of September 1995. They are tested and working....Read More…
This fan is a high-quality 48V brushless DC fan made by Comair Rotron. These fans are NEW in box, but come from surplus stock with a manufacture date of September 1995. They are tested and working. Current models with similar specifications retail for about USD $50; I am selling these below half price.
Red lead is positive (+) power, Black lead is ground (-), and Blue lead is tachometer sense. Connector is a plastic shroud containing 3 standard male header pins on 0.1" spacing.
These fans are reasonably quiet and move quite a bit of air for their size. The RPM and airflow can be controlled by supplying a variable voltage up to a nominal 48V. Minimum operating voltage seems to be around 16V. (I have tested this myself)
Note: I checked the tachometer output on my oscilloscope, and it does not look like a logic-level signal. It appears to be a weak (<0.5V) pulse that probably comes from one of the driver transistors in the motor. Using the tachometer would probably require ac-coupling the signal (through a dc-blocking capacitor), high-pass filtering, and amplification. If you don't plan to use the tachometer output, just leave it disconnected. :)
As far as I can tell, the original datasheet for this model is not available. The linked datasheet is for a similar, current fan from Comair Rotron with slightly different specifications, for reference.
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Note: As these items are from old stock, the following disclaimer applies:
THESE ITEMS ARE SOLD "AS IS", WITHOUT WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR WARRANTY OF MERCHANTABILITY, EITHER EXPRESS OR IMPLIED. BUYER ASSUMES ALL RISK AND LIABILITY AND EXPRESSLY INDEMNIFIES AND HOLDS HARMLESS THE SELLER FOR ANY AND ALL RISKS AND LIABILITIES THAT MAY ARISE FROM THE USE, APPLICATION, OR RESALE OF THESE ITEMS. THESE ITEMS MAY CONTAIN LEAD AND MAY NOT BE COMPLIANT WITH CURRENT RoHS AND/OR ELECTRONIC SAFETY CERTIFICATIONS.
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I'm an avid electronics hobbyist and a talented programmer with a passion for creative problem-solving, design, and systems integration. As a member of the Creltek design group, I enjoy finding elegant solutions to complex problems, and combining hardware and software in new and unique ways. I maintain an extremely wide range of interests, and strive to stay on the cutting edge through constant innovation and application, both at work and during personal pursuit in my free time.
My current electronics research includes LED lighting, resonant high-frequency switching power supplies, embedded systems, multi-core microcontrollers, digital audio and MIDI, and the design of reusable circuit modules for rapid prototyping, research, and development.
My day job involves managing the IT department and teaching at a small private college. You can check out my LinkedIn profile here: https://www.linkedin.com/in/kevpatt
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