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28.5 watt ColecoVision compatible power supply (The best quality PS every made for the ColecoVision)

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45 minutes ago, iridude said:

Very good question. 

To be fair, I assume the epoxy encapsulated PSUs likely weigh more. But if you don't have the two side by side to compare, then that gets to the question.

 

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On 3/21/2021 at 6:12 PM, Charlie_ said:

Mine causes major interference with the video signal. A blue screen looks like it's alive with all the horizontal lines of interference. When using the original supply it's just fine. So now I have this 28 watt supply in a box. Money wasted. It was my mistake for not realizing what was causing the problem and seeking a refund around the time of purchase. 

Thanks for your comments. I have no issues so far on my systems, but I am spending some more time investigating the issue by unpacking some other used unmodified ColecoVisions and purchasing some more power supply samples while spot checking existing inventory of power supplies for possible issues.  

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On 3/21/2021 at 7:12 PM, -^CrossBow^- said:

I have the meanwell and it only produces noise on my CV when I use it with my Extron. If I connect it straight up to my TV's composite input the noise isn't present. Why? No idea. Additionally, the noise isn't present when I use RGB or my HDRetrovision cables from my CV with the Meanwell supply. So it is my main supply for my daily driver CV for the moment. But I also have 2 OEM working supplies at the ready just in case.

 

Its good to hear that your ColecoVision works perfectly fine with the Mean Well 28.5 watt ColecoVision compatible power supply when used over composite video and when used with RGB.

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10 hours ago, DaveC said:

Is this PS adequate for an Adam replacement?

The 28.5 watt Mean Well power supply will power the Expansion module #3 ADAM computer when connected to the ColecoVision. However, keep in mind it well not power the Digital Data Drive or standalone ADAM computer since both of those devices require a dedicated ADAM power supply that uses the special DB9 style wire harness.  

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According to the Mean Well spec sheet Power supply operating temperature is between  -4 to 158 degrees Fahrenheit (-20 to + 70 degrees Celsius).  A storage temperature of up to 185 degrees Fahrenheit (85 degrees Celsius).  All power supplies in my inventory were stored in a air conditioned and heated room at normal room temperatures. 

Edited by HDTV1080P

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Brief update

 

Back in 2019 I purchased a few Mean Well GP25B13A-R1B power supplies at full price of around $35 each from one of the many authorized Mean Well distributors (plus another $10-$16 for the ColecoVision cord which is made in a multi-million dollar automated cable factory in China). The sample power supplies worked perfectly fine on around 5 different ColecoVision’s (both unmodified RF video output and modified video upgrades). For several months and weeks over many hours playing different games there was absolutely no problems. Plus, voltage and current tests were perfect and no interference noise issues in the video at all.    

 

When it came time to offer the power supplies to the ColecoVision community, many authorized Mean Well dealers were out of stock. Therefore, back in early Feb of 2020 I special ordered two cases (54 power supplies per case) which is 108 power supplies. The authorized Mean Well distributor had the Taiwan factory run off 108 power supplies and it took 4 months for the power supplies to arrive (I also received a certificate of conformance from Mean well for the first batch of power supplies).  After testing all the voltage levels and briefly testing each power supply on a ColecoVision they appeared to all work fine after a 5 minute test. Also, since I am not assembling my own homemade power supply, and I am selling brand new power supplies made in Taiwan, I do not want to spend anymore then 5 minutes testing each power supply with ColecoVision cable. A simple voltage test and video test should be all that is needed on each power supply since the original samples works fine.  And in the first batch all 108 new power supplies were tested before shipping. The first batch of power supplies has already been sold and is in the hands of customers.

 

In late June of 2020 I ordered another two cases of a total of 108 power supplies from the same authorized Mean Well distributor.  The authorized Mean Well distributor had the Taiwan factory run off 108 power supplies and it took 4 months for the power supplies to arrive (I also received a certificate of conformance from Mean Well for the second batch of power supplies).  After testing all the voltage levels and briefly testing each power supply on a ColecoVision they appeared to all work fine after a 5-minute test. The second batch is what is currently in my inventory.

 

Theory: I am currently in the process of spot checking the current inventory to see if there is a quality issue that shows up when playing certain ColecoVision videogames and the blue screen skill levels and other screens. Currently I have not found a major issue yet. However, a few minutes ago I did see some very faint noise lines just recently while playing one Cabbage Patch videogame that my Smurf ColecoVision power supply and original Coleco brand power supply does not have. One theory is that some of the Mean Well power supplies in the first batch and second batch might not be manufactured to the same quality level that I received in the original samples that worked perfectly fine. I did notice that in the first batch and second batch that Mean Well switched from a color label to a lower cost black and white style label (but that is a cosmetic issue and hopefully the electronics remained the same quality as the samples from 2019).  

 

I also have random orders in to various authorized Mean Well dealers to see if there is a quality difference with the GP25B13A-R1B when purchasing from a different authorized Mean Well dealer. My two original GP25B13A-R1B’s that were manufactured in 2019 worked perfectly fine.

 

This is a complicated issue, and I well try and post some more detailed results in a few weeks after I have more time to test the current batch of Mean Well power supplies in inventory. These are brand new power supplies and one should not have to spend a massive amount of time trying to see if there is a small amount of interference that exists on some ColecoVisions. I am very disappointed this project did not turn out better. I hope to have more detailed information within a few weeks.

 

Edited by HDTV1080P

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Monoprice North America power cord Product number 7672 place of manufacturing and quality has changed (UL listed but no longer UL certified)

 

As mentioned before the 28.5 Watt Mean Well ColecoVision compatible power supply has a input voltage of 100-240 volts with 50Hz/60Hz at 0.8 amps. One is required to purchase the input power cord style for the country that they live in. Amazon and EBAY dealers for North American customers have been bundling the high quality 18 gauge 125 volt 10A Monoprice product #7672 North American style power cord with every 28.5 Watt ColecoVision compatible power supply. In the past this high-end power cord was made in China and was both UL listed and had the special UL certification sticker. However even though China makes high quality consumer electronics products at a good price, for various reasons many companies in the United States and around the world have been switching their manufacturing from China to countries like Taiwan, Vietnam, South Korea, Thailand, and various other countries.

 

I only have one more made in China input power cord left in stock, and well not be getting anymore since Monoprice has briefly changed the specs and country where they are being manufactured. When ordering from Monoprice the place of manufacturing is no longer China for product number 7672. But instead, is Thailand, and sometimes is instead Vietnam. While some factories around the world can make just as good of products as China, for some reason the Vietnam and Thailand version of the Monoprice 7672 power cord is only UL listed and does not have the UL certified sticker. Therefore, the specs have changed and only the made in China version was both UL listed and UL certified. This is a minor issue for most people since UL listed is good enough. So, when ordering from Monoprice directly or when ordering the Mean Well ColecoVision power supply on Amazon or EBAY, future orders will be for power cords that are only UL listed and made in Thailand or Vietnam. The Vietnam version does not even have Monprices label on the package but the Thailand version does have the Monoprice label.

 

I do have only one more made in China Monorprice 7672 North American power cord left in stock. After that one is sold the rest of the shipments will be Thailand and Vietnam. Also when buying on EBAY or Amazon, international cords like Australia and some other countries have actually received a upgrade in specs compared to what was being offered before, instead of a downgrade (Some cords have went from 1.5 meters to 1.83 meters in length, plus more safety certifications and sealed plastic bags, etc). Most consumers consider the low cost import power cords a minor issue, and companies like Monoprice and others change the specs and place of manufactory from time to time without updating their website.      

 

Monoprice Power Cord - Non-Polarized NEMA 1-15P to Non-Polarized IEC 60320 C7, 18AWG, 10A/1250W, 125V, Black, 6ft - Monoprice.com  

 

3 different countries of manufacoring.JPG

Chinese UL certified version.JPG

Edited by HDTV1080P

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On 3/22/2021 at 10:09 PM, HDTV1080P said:

The 28.5 watt Mean Well power supply will power the Expansion module #3 ADAM computer when connected to the ColecoVision. However, keep in mind it well not power the Digital Data Drive or standalone ADAM computer since both of those devices require a dedicated ADAM power supply that uses the special DB9 style wire harness.  

I was referring to the Mean Well itself.  i.e. is the Voltage and Amperage up to par.  I don't have an issue making a DB9, but I lashed one up and it was pulling the -5 to 0 and the DDP was revving like crazy.

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6 hours ago, DaveC said:

I was referring to the Mean Well itself.  i.e. is the Voltage and Amperage up to par.  I don't have an issue making a DB9, but I lashed one up and it was pulling the -5 to 0 and the DDP was revving like crazy.

The Mean Well GP25B13A-R1B has never been sold as an ADAM power supply. To be sold as an ADAM power supply it would have to offer enough wattage and have the custom molded DB9 wiring harness. However, many people have been able to successfully use their Expansion Module #3 ADAM computer when connected to the ColecoVision while using a ColecoVision compatible power supply like the 28.5 watt Mean Well ColecoVision compatible power supply (except for things like the Digital Data Drive require a custom wiring harness). As long as one is using a ADAMNET keyboard with ADAMNET disk drive it well work with the Expansion Module #3 ADAM computer.

 

28.5 watts might not be enough power to power the ADAM computer Digital Data Drive with a new custom DB9 wire harness. However, the 46.5 watt Mean Well GP50A13A-R1B might be powerful enough and it has a cleaner DC output, but the GP50A13A-R1B has poor quality short circuit protection and if one is unplugging or plugging in an expansion module by mistake with the power on, and there is a short between the 5 volt and 12 volt rails that power supply will be destroyed for one brief short and then has to be tossed in the trash. I was hoping one day that Mean Well would fix the engineering design flaw on the short circuit protection for the 46.5 watt power supply and then change the model number briefly. The GP50A13A-R1B offers a beautiful picture quality on the ColecoVision, and some ColecoVision owners buy the $15.99 custom ColecoVision cable only and take a chance that they will never have a short circuit between the 5 and 12 volt rail. But I choose not to offer or recommend that model because of the short circuit engineering design flaw.   

 

The Apollo 400 watt ADAM power supply works flawlessly with the standalone ADAM and Expansion Module #3 ADAM computer. The Apollo 400 watt power supply is a Micro SFX power supply with a Coleco ADAM wire harness. However back around the year 2014 all ATX power supplies stopped offering the -5 volts DC feature.

Edited by HDTV1080P
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Just pulled the trigger on one. I'll let you all know how it works once I try it out...assuming the wife doesn't kill me for spending yet more money on "that shit" she refers to my collection as.

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Posted (edited)

So far after spending over a week off and on testing and almost two full 12 hour days, I do not see any major issues with this Mean Well 28.5 watt power supply with the samples from inventory and additional samples purchased. I am still waiting for more samples to arrive and well work on some other projects briefly. Maybe in a week or so I might have a more detailed summary but right now I have some other things I need to test right now since I am working on multiply issues at once. Then I plan I getting back to watching some Blu-ray discs and then when my additional power supply samples arrive in a week or so I well test those and hopefully find time to write a more detailed summary.

Edited by HDTV1080P

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