Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_lunar_landings.thumb.jpg.b50378d0845690d8a03305a49923eb40.jpg

astrovirus

Dew controler based LED dimmers

Recommended Posts

So while working on my Aduino focueser has been postphoned momentarly, I decided to make me a dew controler. On the Dutch Astroforum people had been discussing these 12V 8A LED dimmer for cheap on Ebay, so I decided to buy me 3 of those (between 3-6 euros each including postage from Asia :grin:). Wired it all up with 3 seperate channels and put it in a nice project box, ready for those dripping wet nights now. These LED dimmer use a 555 timer PWM that's perfect for regulating power to the dew bands. And they are so cheap on Ebay that you can hardly make them this cheap on your own.

Regards Tim

post-6675-0-01907100-1341648857_thumb.jp

post-6675-0-63649700-1341648872_thumb.jp

Edited by astrovirus

Share this post


Link to post
Share on other sites

I use one of my Multi Channel Dew Controller ports to dim my Red LED necklace around my Obs. Mount pier.

A reversal of operation one might say :grin: .

Ron.

Share this post


Link to post
Share on other sites

Just tested the controler and all seems in order. Now just to get some nice dewstraps for my 70ED and 9x50 finderguider and we're ready for the wet season.

Share this post


Link to post
Share on other sites

I was going to make an aduino automatic dew controller, but none of the programs out there that I can find work with version one hardware, so until I can get my head around programing these things this seems to be a good cheap alternative, and at under £3 each I can make a 4 channel for just over a tenner, diy astro rocks :icon_salut:

Share this post


Link to post
Share on other sites

So while working on my Aduino focueser has been postphoned momentarly, I decided to make me a dew controler. On the Dutch Astroforum people had been discussing these 12V 8A LED dimmer for cheap on Ebay, so I decided to buy me 3 of those (between 3-6 euros each including postage from Asia :grin:). Wired it all up with 3 seperate channels and put it in a nice project box, ready for those dripping wet nights now. These LED dimmer use a 555 timer PWM that's perfect for regulating power to the dew bands. And they are so cheap on Ebay that you can hardly make them this cheap on your own.

Regards Tim

Thank you for that :) I have ordered some :) They're cheaper than the sum of the parts as you say. And my faculties aren't what they were for making up circuits.

Share this post


Link to post
Share on other sites

discussing these 12V 8A LED dimmer for cheap on Ebay, so I decided to buy me 3 of those (between 3-6 euros each including postage from Asia :grin:).

Regards Tim

Tim, can you provide a link to those exact ones, e-bay seems flooded with options all ranging in cost and delivery times.... how long did yours take to arrive ?

Share this post


Link to post
Share on other sites

Those are the correct ones, although i ordered mine form other vendors. Indeed there are a lot of different prices for the same goods, just have to look for the cheap ones. Mine got here within 2 weeks.

It's funny to see a running fire starting here, same thing happened when these items were posted on the Dutch Astroforum. :grin:

Edited by astrovirus

Share this post


Link to post
Share on other sites

i bought some from maplins but these are rated at 6 amp dear though £7 each lol

Share this post


Link to post
Share on other sites

I ordered 4 of those £2.49 ones.

Share this post


Link to post
Share on other sites

And add the £1.77 postage = £2.77 :grin:

£2.77 > £2.49 Q.E.D.

Share this post


Link to post
Share on other sites

Could we have detailed build instructions please?

Looking at the terminals it's two wires in from the supply and two wires out to the LEDs..... simples

Share this post


Link to post
Share on other sites

Could we have detailed build instructions please?

Connect 12v supply to the terminals marked IN with the positive to the V+ and the negative to V-. Connect the load to the terminals marked OUT with the positive of the load to V+ and the negative to V-. With a resistive dew heater the polarity doesn't matter so you can connect the heater either way round. With LED lights the polarity DOES matter.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.