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Old 12th July 2004, 03:01 AM   #1
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Thumbs up SMPS Transformers & Misc. MOSFET's For Sale!

Hi,

I have here for sale the following items:

1. Large SMPS transformer, which is designed to be run in a regulated system and optimized for about +/- 32VDC...but when run in unregulated and unloaded mode, rails would be about +/- 55V. The unit can handle about 500W of output power, and designed for a 10-16V source - $17 each

2. Small SMPS transformer, also designed to be run regulated for +/- 28VDC, free running at about +/- 40V with an output rating of 150W - $14 each

Both the above transformers are compact and very high quality. They were custom made by Coil Tech in AZ and they look great. They are pictured next to a US Quarter to give a size reference. I have 30 large and 35 small units in stock ready to ship right now and can get more if needed.

3. IRFP054N MOSFET, N Channel, 55 V Voltage Rating, TO-247AC Package - $2.25 each with 100 or so in stock

4. IRFP250 MOSFET, N Channel, 200 V Voltage Rating, TO-247AC Package - $2.75 each with 100 or so in stock

5. IRFP9140 MOSFET, P Channel, -100 V Voltage Rating, TO-247AC Package - $2.25 each with 100 or so in stock

These MOSFET's are great for SMPS and audio applications...all my individual types are of the same date code and batch so they are already very close, although I would provide a matching service for the audio devices if enough interest presents itself.

I accept Paypal for these transactions, although other types of payment could be arranged. Trades for heatsinks, power transformers, and other "stuff" might be arranged, feel free to ask if you think you have something I might want.

Shipping will depend on weights of the packages, it will cost more to ship 5 transformers than it will to ship 1. I am thinking that $5 will cover UPS Ground for 2 transformers and the associated packaging to the USA. Foreign destinations will obviously cost more to ship and I have no idea how much that runs to ship...but I would do it as reasonably as possible of course.

I have excellent feedback on another forum ( www.rcgroups.com ) and have been selling my stuff there for quite some time...never any complaints with my service, products, or support You will note that my prices are excellent for small quantities, I have found none lower with my search for the parts on small quantities. I will see about donating some of my profit to DIY Audio as well.

E-mail me with any questions or if you would like to purchase!




-Matt

switchmaster@hotmail.com

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Old 12th July 2004, 03:03 AM   #2
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The MOSFET's:
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Old 14th July 2004, 03:37 AM   #3
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Default Bump!

I would have thought there would be more people interested...these transformers are hard to find and here they are! Along with good audio and SMPS MOSFET's for a lower price than anywhere else.








-Matt
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Old 14th July 2004, 03:56 AM   #4
nowater is offline nowater  Australia
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Do you have a suitable circuit diagram for a SMPS using these parts?
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Old 14th July 2004, 01:01 PM   #5
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Right at this moment I don't have one that I can post. There are several floating around the forum that would do fine, I'll see what I can have posted by the end of today.














-Matt
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Old 14th July 2004, 01:42 PM   #6
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whats the winding ratio of the large transformer, and whats the dimensions of the complete transformer, and the core alone? thanx..
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Old 14th July 2004, 01:48 PM   #7
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hey, nowater... you got msn or something? maybe we could share postage costs. you interested in purchasing something? I think I am
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Old 15th July 2004, 01:47 AM   #8
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The winding ratio of the larger units are 1:5 for each primary:secondary. ie. there are two primaries with two turns each, and two secondaries consisting of 10 winds each.

The primaries are multi-stranded and ultra-beefy. The larger secondaries are also multi-stranded. The small unit has smaller primaries and secondaries, but they are easily capable of the powers I posted.

Sizewise, the large unit is about 2 3/8" in diameter and a shade over an inch tall, excluding the huge wires. The small unit is about the same height but only 1 5/8" in diameter. Metric they are both 2.5cm tall, the large is 6cm in diameter and the small one is 4.5cm in diameter.

Any other questions feel free to ask.

I have no idea how much it will cost to send to Australia, perhaps a few people ordering at one time might save some cash. It costs me $5 or so to ship one large and one small unit in the US. What I could do is take payment for JUST the transformers via Paypal, I'll go ahead and ship them, then I will give you actual shipping costs and you can make another payment to cover shipping. Does that sound reasonable?




-Matt
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Old 15th July 2004, 01:48 AM   #9
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Oops, and the cores are about 5/8" tall and 3/8" thick on both sizes. The large unit has a core diameter of 1 7/8" and the small one has a core of 1 1/8" diameter.

BTW: The IRFP054N's are perfect for these SMPS's!







-Matt
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Old 15th July 2004, 03:17 AM   #10
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how do you figure your output voltages??

if the windings are 1:5 then with 10 volts in, its 50 volts per secondary out.... with 16 volts in, its 80 volts...... with 13.8 volts which is what can be expected in a car, then 69 volts....... your winding ratio is too great.... I mean, it would be fine for Rod Elliots Mosfet amp.......... but for a transistor amp, the amplifier output power would exceed the transformers rating for those voltage rails.

anway, I'll leave you alone now.. seeya
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