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skeggordon 13th May 2012 06:08 AM

250W SMPS on Ebay, good for chip amps.
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For sale now on Ebay is a 250W switchmode power supply designed specifically for the DIY market. As configured it has regulated +/-40V outputs, plus auxiliary outputs of 10V and 15V. It is current limited and short circuit protected, thus providing protection to your amplifier as well. Detailed specifications can be found at the Ebay listing. `It has been incorporated into an amplifier with a pair of LM3886 amplifier IC's, delivering 65Wrms/channel into 8 ohms. This amplifier weighs only 2.5 pounds with dimensions of 9.5 x 5 x 2.5 inches. It is simple to install, just 4 screws to secure, and screw terminal blocks, not pin headers for electrical connections.

An unusual feature of this supply is a small breadboard area in one corner of the PCB. Here you can add circuits for LED displays, fan drivers, and other supply voltages. The plan is to develop a library of useful circuits over time.

The 40V outputs are independent, and can be reconnected in parallel for a single 40V output with greater current handling, good for many "Class D" or switching amps that use a full bridge configuration. This requires the replacement of two SMT resistors on the PCB, the supply can be ordered this way.

There is one for sale currently (at an introductory price), more are available. Search for seller skeggordon to find this item. A website with more detail is going up within two weeks, will post when it is ready. An operations manual will be supplied with each unit, it has information regarding the electrical and mechanical aspects of the power supply required to use this unit with your amplifier.

smoothpower 16th May 2012 12:35 AM

SP-02 listed on Ebay
An SP-02 power supply as described in the previous post is listed on Ebay, search for item number 3D230791039221. With starting price of $55, and a buy it now price of $70, this power supply solution is very competitive with the usual toroidal xfmr, rectifiers, caps, etc. The chassis can also be smaller and lighter. Easily installed with no soldering. The fully regulated output voltage protects your amplifier, and tightens up the low end. There is a one year full money back guarantee, so there is little risk in trying one out.

jtktam 16th May 2012 03:32 PM

230791039221 is the correct item # btw.. i couldn't find it with the # you provide


smoothpower 17th May 2012 04:07 AM

The right number is 230791039221.
Thanks, joe for pointing out the incorrect listing number. Apparently the 3D prefix hitched a ride during the cut and paste operation. More photos will be posted shortly.

jtktam 17th May 2012 01:07 PM

can you post a few more pictures or the connections, etc?



smoothpower 18th May 2012 03:56 AM

Joe, some more pictures and the instruction manual will be coming in a day or two. Probably in the form of a website to be announced. The manual is too large to upload to this forum. Thanks for your patience, JG.

smoothpower 20th May 2012 11:37 AM

Joe, if you like just send a PM to and I'll reply with the instruction manual attached.

Yours, Jay

smoothpower 25th May 2012 02:56 AM

The Ebay listing number is now 230796294252.

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