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Optimus 900 MHZ wireless speaker transmitter & 18 VDC adapter for transmitter. My wireless speakers quit working & I think the adapter for the transmitter is dead, and it might have also destroyed the transmitter. I need replacements for these. I have part numbers from a RadioShack list, but they don't have them anymore. Help ?

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Posted on Jan 02, 2017

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SOURCE: I have a Prolink wireless

I have Prolink 900 MHz wireless loudspeakers, probably the same as yours. The transmitter is labelled on the bottom as "CAN 2579 102 1811, UNI-ART PRECISE PRODUCTS LTD". That transmitter comes with an AC/DC adapter whose output is labelled as 12VDC, 300mA, with polarity positive outside, negative inside. Note this polarity is the OPPOSITE of what is typical for AC adapters.

Posted on Dec 06, 2010

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My husband three away my transmitter to my Centrios 900 MHZ DIGITAL HYBRID WIRELESS OUTDOOR SPEAKERS. #4015004


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I have a Prolink wireless 900 Mgh wireless speaker system. I have just moved and have lost the plug in adapter for the transmitter. could you tell me what the adapter voltage is into the transmitter. ...


I have Prolink 900 MHz wireless loudspeakers, probably the same as yours. The transmitter is labelled on the bottom as "CAN 2579 102 1811, UNI-ART PRECISE PRODUCTS LTD". That transmitter comes with an AC/DC adapter whose output is labelled as 12VDC, 300mA, with polarity positive outside, negative inside. Note this polarity is the OPPOSITE of what is typical for AC adapters.

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yeah, I looked it up on thier website. Here is what they say.

Warning: This product is designed to work with line level outputs or headphone outputs only.

DO NOT connect it directly to speaker outputs as it will permanently damage the transmitter.


You can use these as surround speakers if you like. You just need a line level surround output on the receiver. Most high end receivers have this feature but, you may only have speaker level outputs.

If that is your case the only option you have is to use a "speaker to line level adapter".... http://www.crutchfield.com/p_543ADP12/Russound-ADP-1-2-Speaker-level-to-Line-level-Adapter.html?tp=9070

Now crutchfield.com is always a little high on prices but if you look around I have seen them around $10 online.

Good luck with your project.

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Glad to be of service...

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Hi, assuming you can open the enclosure of the Advent, work on the amp section (please make sure you've isolated the power supply and you will be working with the low voltage section of the circuitry only.) Inject an audio signal, it does not matter where in the amp section, just try the different solder points of the small capacitors normally in the 1uf value. at least one of them should give you a good amplified output from the speakers. In the absence of a signal gen, you may want to try (with care)using your bare finger which should produce a humming sound of about 60HZ or a slight thump in the speaker. If such a sound is produced, then the amp is good and the powersupply is doing its work. You have now isolated the problem to the 900MHz receiver. Am not sure if you can purchase modular replacement in your area but you can also try the sig gen or finger method except for the front end (rf section). Re the humming sound, such a problem is normally related with the power supply section with a defective or leaky capacitor. It is also possible that the input stage of your amp is not grounded right. You actually have just to work on it in stages to simplify fault diagnosis. Since you can hard wire, why not try salvaging parts/module from one unit and putting it in the other to make at least one working while looking for replacement parts/module for the other half of the Advent. Hopes this work out for you. Please let me know how things turn up. Regards

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