Jump to content

Banner.jpg.b83b14cd4142fe10848741bb2a14c66b.jpg

Is this dumb?

Slimstar

Recommended Posts

Slimstar

Slimstar

Posted
Posted

Hi 

I owned a Celestron 130SLT

It has a power socket I can plug in to power the telescope. 

I bought a power adapter but it does not power the telescope when I plug in the pin. I am thinking of just plugging it into the battery connector instead. If I just set it to 12V and plug it into one battery connector and leave the other one empty, is it a dumb thing to do?

post-39033-0-37884500-1411741384_thumb.j

post-39033-0-37009400-1411741386_thumb.j

post-39033-0-62128300-1411741387_thumb.j

Link to comment
Share on other sites
jamespels

jamespels

Posted
Posted

You'll mullah the board in an HEQ5/EQ6 instantly if you connect in reverse ... even at just 12v.

Fair enough - will take note not to connect mine wrong way round!

Bit odd though - if the electronics are that sensitive, I would have thought a couple of diodes would be in order to protect them.

Link to comment
Share on other sites
Steve Ward

Steve Ward

Posted
Posted

That would be the sensible way , but I guess it would be too much to ask from them.

I make sure that my power connector is firmly taped together as the very end is easily separated , just a replaceable tip on two prongs , all too easy to put back wrong inadvertently if if becomes detached by snagging the lead.

I also make sure that the switches on the PSU are locked in the correct position with a dribble of hot-melt glue , as they are all too easily knocked into a potentially damaging position.

Link to comment
Share on other sites
Ptarmigan

Ptarmigan

Posted
Posted

Oh dear, I wish I had not read this topic, I fear the outcome :(

I was about to say something to the effect of "Believe Uncle Steve for he draws wise diagrams"

But instead I am going to say do as Steve says, measure twice with multimeter before connecting once !

I go further, test your meter, use a primary cell (an AA single use) that the meter  has its red and black leads in the right holes if it is an analog meter (ie. no minus symbol in a digi display ! , even then , , ?! )

Why am I doing all this typing ? I remember I had a similar switchable elcheapo wallwart that I had consigned to the heap :-

I got it out just now and measured it and the switch position indicated by the cramped sylised symbols that suggested to me tip positive

ie. a + inside a circle close to the tip picture  is actually measured as -ve :( :( :( wrt the body

which is why I consigned it to the heap ( actually it resides in a box to provide residual heat to my Sourdough Cultures ! )

Phew, trust not your dearly beloved expensive toys to cheap wallwarts  !

And  a protection diode is easily included in low power demand electronics at the design stage where the 0.6v (or similar or suchlike ) drop can be factored in.

The cost of a diode ? huh

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.