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jerry12x

What size DC plug for a Sky-watcher 127 GOTO

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I went and lost it.

I then bought the wrong one on ebay and just want the plug I can solder on.

 

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Thank you very much for that. It is the size I bought.

It  must have been changed somewhere along the way as the center pin is slightly larger than 2.1mm.

That is a really good faq by the way.

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This is what I use with my Skywatcher and Celestron Az-Alt mounts (tripod & Dobsonian):-

http://www.maplin.co.uk/p/maplin-21-x-55-long-dc-power-plug-hh61r

The longer barrel (14mm instead of the shorter 9.5mm) ensures good contact with all depths of 2.1mm sockets. A 2.5mm ID plug will fit in the 2.1mm socket on the mount, but makes poorer contact with the socket's centre pin.

Note, a 2.1mm plug will not fit in a socket with a 2.5mm centre pin.

I always check with a voltmeter, to ensure that the +12V is in the centre, before plugging a newly-soldered lead.

Afterthought:-

Has a previous owner substituted a 2.5mm ID socket for the 2.1mm original? If so, go for

http://www.maplin.co.uk/p/maplin-25-x-55mm-long-dc-power-plug-hh63t

Geoff

Edited by Geoff Lister
Afterthought

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On 30/05/2017 at 11:47, Geoff Lister said:

I always check with a voltmeter, to ensure that the +12V is in the centre, before plugging a newly-soldered lead.

Good point - I'd also check there are no shorts across the soldered connections - I once had a PSU fuse pop due to a very thin 'solder bridge' across the connections. I had checked for no continuity with my multi-meter but it must have been higher resistance than the <200 Ohm continuity check on the meter. Since then I always also check using a higher resistance range.

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