Astronomy

Celestron uncommon DC long barrel connector

Celestron uncommon DC long barrel connector


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I have tried to connect a 12v DC adaptor and also a battery pack to my telescope unsuccessfully. Sadly it seems Celestron DC jack needs to be around 2mm longer than common 5525 DC ports. I was wondering what are those barrel connectors called so I can google it to find a male to male cable that is compatible. And if Celestron is using an uncommon port to make customers buy its products or there is a technical reason for that?

Celestron DC5525 connector with ~14mm head.

Celestron DC5525 connector with 10mm head

I found this amazing illustration


Celestron Powertank --> 6SE connection?

Got my new 6SE unboxed and set up today. Runs fine on 8 AA batteries (at least until they drain, which I understand will be in 3-4 operating hours at best).

Got my Celestron Powertank since, you know, it is supposed to be designed by the same company to connect with and power the Celestron Nexstar telescope. Found the cigarette adaptor connector cord hidden in the secret compartment of the Powertank. Connected it to the cigarette lighter power output on the Powertank, connect the other end to the jack next to the power switch on the SE mount. Nothing. No power, hand controller does not light up, nothing.

Checks done so far. Yes, the Powertank is charged up, green light indicating full charge. The big flashlight lights up, so it has power. Connected my dew heater controller to the same cigarette adaptor connector on the Powertank, the controller lights up and appears to work. So I think the cigarette adaptor connector on the Powertank is ok. As noted, the SE mount works on AA batteries so it is not a dead mount.

So, I think it must be either a problem with the cigarette adaptor connector cord (the one from the secret compartment), or with the jack next to the power switch on the SE mount. Or, I'm missing something entirely and the output from the cigarette adaptor connector cord is not the right type of power for running the SE mount. As far as I can tell, there is nothing in either the Nexstar manual or the Powertank manual explaining how to connect the two. (The Powertank manual does tell you how to jump your car battery with it, but not how to connect it to power your Celestron telescope).

Anyone have any similar problem? Any ideas, other than seeing if I can get a replacement connector cord from Celestron? If the problem is with the jack on the mount then I guess I will need to return the entire scope, or at least the mount.


Wonder which 3rd-party 2.1mm X 5.5mm barrel connector works reliably?

Hello CloudyNights teammates. I'm searching for a 3rd-party 2.1mm X 5.5mm barrel connector that works reliably in place of the tips on Celestron DC power cables. I have already tried these:

So we can mark those off the list. The male barrel connector plugs do not power, for example, the fan motor in a Celestron RASA 8" scope. The original cigarette lighter adaptor connector cable works reliably because the barrel connector has a very different design. I'm making a power distribution box and therefore would rather find a packet of plugs with a pigtail of wire already attached. I'd rather not cut the ends off of the Celestron cables that I have - if I can avoid that. Can anyone point me to something that works reliably? If so, thank you in advance!

#2 mrowlands

"The male barrel connector plugs do not power, for example, the fan motor in a Celestron RASA 8" scope."

Is the fan motor jack not 2.1mm? Could you describe the problem?

#3 EmeraldHills

Hi Mike. Celestron proprietary plugs appear to have a center "pipe" that literally begins at the "front" of the barrel. Third-party plugs appear to rely on a different kind of hardware. Viewing the "pipe" inside the barrel, the metal contact isn't visible as we look at it. So we need a barrel connector that someone has used that is tried/tested/true. Thanks for asking!

"The male barrel connector plugs do not power, for example, the fan motor in a Celestron RASA 8" scope."

Is the fan motor jack not 2.1mm? Could you describe the problem?

Mike R.

#4 mrowlands

Hi Doug. As far as I know, the difference in the styles of the barrel shouldn't matter as long as the physical dimensions are correct. In fact, the ones you linked to are arguably more safe because they don't expose the inner metal as you're describing.

At any rate, I've used a variety of no-name DC plugs with my Celestron mounts, and I know that Switchcraft plugs work. You might find them at a local sound shop, or you can get them at Digi-Key. Not sure if you can get them with pigtails, and if you solder your own, you'll have to slightly drill out the center conductor mounting hole if you want to use 18 AWG wire (which is what I do, and is probably true for any 2.1 x 5.5).

#5 EmeraldHills

Thanks Mike. Would you mind helping me verify - (because the selection is a bit overwhelming) at.

are you saying that you've actually used a 762Z plug with a celestron RASA fan jack and you've seen it work? Do I have the exact plug that you verified?

#6 EmeraldHills

I can reliably state without question that the connectors at.

do not make contact and will not power a RASA 8" fan. That's confirmed, Mike.

Hi Doug. As far as I know, the difference in the styles of the barrel shouldn't matter as long as the physical dimensions are correct. In fact, the ones you linked to are arguably more safe because they don't expose the inner metal as you're describing.

#7 mrowlands

Hi Doug, Sorry about that I was fixated on the Celestron mount jacks, but it sounds like the RASA fan connectors are different. (Unless the plugs you bought are defective!)

Hopefully someone else will know the name of the plug they use.

Otherwise, maybe we can help if you post some closeup pictures of the plug on the Celestron power cord for the fan.

#8 EmeraldHills

Hi Mike. No need to apologize! I'm actually grateful that you would try to help.

I can post a picture from home later - but the truth is, I'm actually looking for someone who has actually purchased, used, and verified a connector that will reliably work with a Celestron jack - like the one in the RASA fan. So I'll keep looking and hoping that someone who has confirmed a reliable plug will pop into this thread. Thanks again.

Hi Doug, Sorry about that I was fixated on the Celestron mount jacks, but it sounds like the RASA fan connectors are different. (Unless the plugs you bought are defective!)

Hopefully someone else will know the name of the plug they use.

Otherwise, maybe we can help if you post some closeup pictures of the plug on the Celestron power cord for the fan.

Mike R.

#9 t-ara-fan

I can reliably state without question that the connectors at.

https://www.amazon.com/dp/B072BXB2Y8

do not make contact and will not power a RASA 8" fan. That's confirmed, Mike.

At .50 each . I am shocked. LOL. Or is the fan connector not a standard 2.1mm x 5.5mm connector? Post a pic!

I buy these 2.1mm and 2.5mm connectors with built in 6' pigtails. They are about $5 per. Your choice of straight or 90° connector. I have used them for about 4 years - I cut them to length and put Powerpole connectors on them. Never a problem.

6' 90° red/black cable 18ga https://www.digikey. 0-01780/5638256
6' straight connector red/black cable 18ga https://www.digikey. 0-02317/7087226
20' straight connector black cable 16ga https://www.digikey. 0-02378/6593487

There is always one part that needs a 2.5mm x5.5mm connector, often a USB hub or my Optec focuser.

I really like the red/black wires, makes it hard to mix up the polarity. The black cable above has marks on the (-) wire.

Edited by t-ara-fan, 24 May 2021 - 07:26 PM.

#10 omomomo

I use this to power my AVX mount, it is a very snug fit:

It was not this expensive when I bought it.

#11 EmeraldHills

These look like great connectors. Surely they would work. I'll try them. Thanks guys.

#12 EmeraldHills

Interestingly, these connectors will power the cooler on a ZWO astro camera. So that RASA fan must be a pesky not-quite-standard connector.

#13 NearVision

Just so you know. The Philmore brand on Amazon that Omomomo linked has some history. If it's the same company doing the same quality of work, and I think they are because I've tried a few of their connectors recently. They've been selling connectors and cable since the early 70's that I'm aware of. We sold that brand at the local electronics shop I worked at then. They were never as good as SwitchCraft but they did a decent job for less money and unless you really needed the quality and durability of SwitchCraft they were the goto cable company for us. They worked, but don't expect to treat them as roughly as a SwitchCraft cable or plug. Just go buy another one and still usually save some money for the price difference.

#14 EmeraldHills

Tonight I've been working on the other connectors and it looks like the RASA fan connector is the ONLY one that won't cooperate with the barrel connectors I've already purchased. Must be something weird about that jack.

#15 mrowlands

Well, since nobody has answered specifically about the RASA connectors, and now that we know that there isn't anything wrong with the 2.1 x 5.5 plugs that you bought, the question is: Is the problem a physical fit or just the electrical connection?

Would still like to see closeup pictures of both the Celestron plug and the RASA socket.

Also, do you have an ohm meter?

Edited by mrowlands, 25 May 2021 - 07:34 AM.

#16 EmeraldHills

Hi Mike. Thanks for taking time to follow up. I meant to do pictures last night and completely forgot. I'll be sure to remember tonight.

Like I said - it's kind of you to want to help. but the best help will be a RASA 8 user who has found a barrel connector plug that actually works with the RASA 8 fan jack (other than cutting off the end of an existing Celestron power supply plug - which is what I did last night, just to get me by for now).

I have a Volt-ohm meter. There's continuity between the "tip" and the positive (red) cable on the connector I've wired. There's no continuity between the tip and the black. (The "outside" of the barrel shows continuity with the black half of the wire.) The connecting cable that I've created works fine in the ZWO ASI camera cooler plug. So there's nothing wrong with my connection. And the Celestron power supply cable powers the Celestron fan just fine too. So although it's a valiant effort to ask if I have a volt-ohm meter, unfortunately, from my vantage point, that question isn't going to solve things. What I've needed all along is to find a RASA 8 owner who has successfully found an after-market plug that works with the fan. It's a small thing - because it works to cut off the end of a Celestron power supply cable. Just. for the sake of having a good backup (for these flimsy Celestron cables), I'd love to make a custom cable sometime to have on hand.

Thanks again for asking though.

Well, since nobody has answered specifically about the RASA connectors, and now that we know that there isn't anything wrong with the 2.1 x 5.5 plugs that you bought, the question is: Is the problem a physical fit or just the electrical connection?

Would still like to see closeup pictures of both the Celestron plug and the RASA socket.

Also, do you have an ohm meter?


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  • traffic locations
  • Cord length
  • cord
  • Fits
  • power unit
  • CG-5
  • screw adapter
  • ring
  • base
  • price

Of course it's great who wouldn't want it with their scope the problem I have is I don't understand why is not included with the scope even if you charge the price for it

Not much to say, works good. Cord length is long, which is good as it allows running the cord away from your normal traffic locations.

Second one I've bought, the power plug where it meets the Transformer, somehow pulls away from the transformer resulting in exposing the wires and shorting out. As are most transformers prone to do. C an't someone come-up with a better design?

The CG-5 has a screw adapter for the power cord, but the original power supply did not have the female ring to attach. This 5-amp power does, but it will not screw together. The male base on the mount is too small. I disassembled the base to see if it could be adjusted but it cannot. So, the power cord is still too lose and occasionally disconnects the mount, resulting in loss of alignment. The power unit is okay, just Celestron' s setup is poor.

The product works as advertised. The length is sufficient to work on my Celestron 8" EdgeHD Optical Tube Assembly which sits on top of my Celestron CGEM II mount. I comes with an extension that attaches to the main section. The main section and one end of the extension possesses threaded barrel connectors. I use the extension, inserting the male plug with its threaded locking piece into the power port. Then securing it with threaded barrel connector. Then I insert the male threated plug of the main section into the female plug/port of the extension. You can screw down the threaded barrel connector to prevent it for coming loose if pulled upon and I have also used it simply connected. Threading on to the extension I'm sure prevents power-offs due to inadvertent cable pulls. However in a crowded area with foot traffic that may not be accustomed to numerous cords hanging or lying about, it may be best to leave it simply connected. Example: Public Star Parties, so if it is accidently tripped over it will not pull the scope over or damage it or the plugs. I believe using the extension and providing enough slack on the side where is connects into the power port, will reduce the wear on the wiring near the connector. Back and forth moment or bending can break or wear wiring. I would suggest also wrapping a small piece of electrical where the main section and extension join. Using only enough to prevent the contacts for getting wet from condensation. If you plan do astrophotography now or in the future, I believe it is a must have item if you will image anywhere with a 110v outlet. The cost may appear high, but the product appears well manufactured, and the design seems reliable to me. I used the normal and free shipping which was through the United States Postal Service (USPS) Priority Mail. It arrived ahead of my telescope order, which was placed the same day. The telescope was shipped by United Parcel Service (UPS). The package was very well packed. I recommend this product and this store. OPT customer service has and continues to set the standard for online customer service.


Car Battery Adapter (For All NexStar)

The hobby of amateur astronomy frequently takes the observer away from sources of AC power. After all, we are always in pursuit of the darkest skies possible, and that often means going off the grid. The most common way to power your telescope in these situations is to use a portable 12V battery pack, like the Celestron PowerTank, or to use power from your car’s battery via the cigarette lighter.

The Celestron Car Battery Adapter is the accessory required for connecting any Celestron computerized telescope to a DC power supply or car battery. Plug the round post into the 12V input jack on the drive base of your telescope*, and insert the power connector into the cigarette lighter outlet in your car or on your power supply. The cord is 25 feet long, giving you plenty of reach between your telescope and 12V power source.

The barrel connector can be used with any telescope that uses a receptacle with an outside diameter of 5.5mm and an inner diameter of 2.1mm and a “tip positive” polarity.


Celestron uncommon DC long barrel connector - Astronomy

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Celestron power tip

What is the size of the Celestron power plug? Thanks.

#2 junomike

#3 markb

5.5mm outer barrel and 2.1mm inner pin 'hole'.

It is usually listed as 5.5x2.1.

The outer barrel is easily measured with calipers, but the inner measurement is a bit harder to take.

Meades take a 5.5x2.5 barrel plug, so the Celestron plug won't fit in the Meade socket. The Meade plug fits in the Celestron socket but does not make contact with the pin.

Adapters are available to change the plug type. Fortunately one of them, IIRC the Celectron 2.1x5.5 is a 'standard' female size in adapter sets on EB.

I believe a 2 amp minimum works best on the goto scopes, as does the CN user applauded Talentcell battery pack (with the Celestron style plug).

Edited by markb, 01 July 2019 - 09:34 AM.

#4 SgtSluggo

Be careful if you are buying an aftermarket power source designed for something else. I went through 3 AC adapters that should have worked (5.5x2.1 - 2-5amp) before finding one that actually worked. The standard Celestron plug seems to be longer than many other plugs of these specification. Good luck finding length on any spec list though.

#5 Noah4x4

Be careful if you are buying an aftermarket power source designed for something else. I went through 3 AC adapters that should have worked (5.5x2.1 - 2-5amp) before finding one that actually worked. The standard Celestron plug seems to be longer than many other plugs of these specification. Good luck finding length on any spec list though.

+1 for this. Replacement Celestron power supply adapters are in short supply in the UK.

I purchased an AC/DC adapter via Amazon UK described as "compatible with Celestron telescopes" (hence 12v). Fortunately I noticed on delivery that it's label said 19v. Quite clearly a laptop charger had found itself in a box labelled 12v. Not sure what damage it would have done if I tried it.

It took me a number of attempts to find a correctly rated unit. However, the 5.5mm/2.1mm plug wasn't the issue as that is common standard, at least in the UK. Be very careful to state the correct rating when ordering. If you mention only plug size there is a fair chance you will mistakenly receive a 19v laptop charger.

#6 Geo.

Be careful if you are buying an aftermarket power source designed for something else. I went through 3 AC adapters that should have worked (5.5x2.1 - 2-5amp) before finding one that actually worked. The standard Celestron plug seems to be longer than many other plugs of these specification. Good luck finding length on any spec list though.

Yes, you may have to perform a circumcision on some PS plugs to get them to fully engage in the Celestron power jack.

#7 Arctic_Eddie

I bought a [email protected] switcher supply that appeared to be identical to a previous purchase. The first one had a 5.5mm x 2.1mm plug while the second had a 5.5mm x 2.5mm plug. Neither the sellers info nor the text on the PS body showed the plug dimensions. If you encounter this situation then be prepared to make an adapter or cut the plug off and replace it with the smaller version. You can buy the plugs with a 15mm barrel length which should solve any depth problem.

Edited by Arctic_Eddie, 03 July 2019 - 08:42 AM.

#8 Ski-Patroller

+1 for this. Replacement Celestron power supply adapters are in short supply in the UK.

I purchased an AC/DC adapter via Amazon UK described as "compatible with Celestron telescopes" (hence 12v). Fortunately I noticed on delivery that it's label said 19v. Quite clearly a laptop charger had found itself in a box labelled 12v. Not sure what damage it would have done if I tried it.

It took me a number of attempts to find a correctly rated unit. However, the 5.5mm/2.1mm plug wasn't the issue as that is common standard, at least in the UK. Be very careful to state the correct rating when ordering. If you mention only plug size there is a fair chance you will mistakenly receive a 19v laptop charger.

When I bought my Evo 8 second hand, the seller gave me the wrong charger, a 19 v for a lap top, I didn't know any better, but it did not break the scope. I did get a fast blink pattern, but after getting the proper charger, everything is fine.


An Improved Design

The EQ head position of the CGX-L is adjustable, which may help you optimize the center of gravity over the tripod once your astrophotography gear is mounted. This will also offer more flexibility in terms of latitude adjustments, as this mount is capable of setting latitudes of 3°- 65°.

The dual dovetail saddle provides convenient mounting options for both Vixen and Losmandy dovetail bar configurations. My Sky-Watcher Esprit 100 ED and William Optics Fluorostar 132 telescopes both feature the wider 3-inch “Losmandy” style dovetail for improved stability, and fit securely on the CGX-L.

The tripod itself is exceptionally solid and stable. The 70mm legs are the biggest I have ever seen, yet do not take up an absurd amount of space when collapsed. Celestron has noted that the legs now sit wider than ever before, which adds stability.

When I realized this subtle change, I instantly thought about how JMI will need to produce a new, wider Wheelie bar to accommodate the CGX-L. Speaking of subtle changes, the minimum height of the tripod has been lowered based on user feedback (not from me… I’m 6’3”!).

The integrated handle is very much appreciated when lugging the massive EQ head of the mount around when not attached to the tripod. It is extremely heavy, yes, but surprisingly manageable considering the incredible 75-lb payload capacity it can carry.


12-volt Car Battery Adapter for Advanced VX, CPC, NexStar, CGEM II

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  • Power your Celestron computerized telescope from your car battery or a portable 12V DC power supply.
  • Barrel connector plugs into the 12V input jack on the telescope drive base.
  • Power connector fits standard automobile cigarette lighter receptacles, also found on portable 12V battery packs like the Celestron PowerTank.
  • 25-foot cord for lots of reach.

The hobby of amateur astronomy frequently takes the observer away from sources of AC power. After all, we are always in pursuit of the darkest skies possible, and that often means going off the grid. The most common way to power your telescope in these situations is to use a portable 12V battery pack, like the Celestron PowerTank, or to use power from your car’s battery via the cigarette lighter.

The Celestron Car Battery Adapter is the accessory required for connecting any Celestron computerized telescope to a DC power supply or car battery. Plug the round post into the 12V input jack on the drive base of your telescope, and insert the power connector into the cigarette lighter outlet in your car or on your power supply. The cord is 25 feet long, giving you plenty of reach between your telescope and 12V power source.

The barrel connector can be used with any telescope that uses a receptacle with an outside diameter of 5.5 mm and an inner diameter of 2.1 mm and a “tip positive” polarity.

For use with the following Celestron telescopes:

  • NexStar SLT Series/NexStar SE Series
  • CPC/CPC Deluxe Series
  • Advanced VX Series
  • CGEM /CGEM II
  • CGX/CGX-L

Compatible with most iOptron mounts (including CEM25/40/60 & GEM45) except the CEM120.


Celestron CAR BATTERY ADAPTER (FOR ALL NEXSTARS)

The hobby of amateur astronomy frequently takes the observer away from sources of AC power. After all, we are always in pursuit of the darkest skies possible, and that often means going off the grid. The most common way to power your telescope in these situations is to use a portable 12V battery pack, like the Celestron PowerTank, or to use power from your car’s battery via the cigarette lighter.

The Celestron Car Battery Adapter is the accessory required for connecting any Celestron computerized telescope to a DC power supply or car battery. Plug the round post into the 12V input jack on the drive base of your telescope*, and insert the power connector into the cigarette lighter outlet in your car or on your power supply. The cord is 25 feet long, giving you plenty of reach between your telescope and 12V power source.

The barrel connector can be sued with any telescope that uses a receptacle with an outside diameter of 5.5 mm and an inner diameter of 2.1 mm and a “tip positive” polarity.


Watch the video: Celestron EFocuser (June 2022).