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5v Svbony Dew straps on asiair plus

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6 replies to this topic

#1 golfermike22

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Posted 02 October 2022 - 11:41 AM

Newbie getting into this wonderful hobby.  I have astro-tech 70ed.  I have been able to use my asiair plus learning and watching every day.  I definitely need a dew strap as experienced the couple of nights photographing.

My question is if I buy the svbony dew straps which claim to require 5v, can I use the 12v power ports on the asiair and control the power output?



#2 Jim Davis

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Posted 02 October 2022 - 12:33 PM

The 5v ones are USB powered. Probably just better to plug into a USB port.



#3 golfermike22

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Posted 02 October 2022 - 03:24 PM

I'm trying to avoid using the usb port.  Thanks for the reply. 



#4 Cliff Hipsher

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Posted 03 October 2022 - 09:48 AM

Measure the circumference of the dew shield on your 70ED.  Go to Agena Astroproducts

 

Find a heater with the same length as the circumference of the dew shield.

 

Go to eBay and get some of these connectors : https://www.ebay.com/itm/125210296382

 

Now you can cut the heater cord to the length you need, solder on the new connector and you're ready to rock and roll.


Edited by Cliff Hipsher, 03 October 2022 - 09:51 AM.


#5 hlee

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Posted 03 October 2022 - 02:47 PM

You'll have to check the voltage required/supplied, but you should be able to use a cell phone power bank.

 

https://www.amazon.c...ef=nb_sb_noss_1

 

 

Make sure it's not a charger but a power bank something that actually contains a battery.


Edited by hlee, 03 October 2022 - 02:51 PM.


#6 Enance42

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Posted 04 October 2022 - 07:14 AM

I have 3 of the USB dew straps and run them off of a power pack like the previous post suggests, works great.

#7 MellonLake

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Posted 04 October 2022 - 01:32 PM

You need to know if the 12V output is pulse width modulated or voltage modulated.  If it is voltage modulated you can figure out what setting represents 5V and limit the voltage to less than 5V. If it is PWM modulated I would not try it. 

 

In general, I would not recommend trying to run 12V through a 5V resistive heating device like a heater band.  This would likely cause the band to either failure immediately or degrade quickly.  I did a quick calculation assuming the power output at 5V is 2W  at 12V the power output would be almost 12W or nearly 6 times that at 5V.   

 

 

Rob




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