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Re: Alarm system transformer + power supply (would both go bad atonce?)



Michael A. Terrell wrote:
>
> Danny D'Amico wrote:
>>
>> On Tue, 26 Nov 2013 23:21:02 -0600, Nightcrawler® wrote:
>>
>>> Not weird at all.  The ground is electrically isolated from the
>>> secondary of the transformer.  What you are seeing is phantom
>>> readings.

You need ceter tap to do a full wave rectification with two diodes vs.
4 without center tap which is bridge rectification.
>>
>> Thanks for the confirmation. I have no experience with this type
>> of transformer. I wonder why they even have the center lug, but,
>> maybe it's for other applications.
>>
>> If I were a technician, it wouldn't have taken this long to
>> get a replacement transformer, so I would have been at this
>> stage within the first hour had I a new one in stock.

You did not have to use exact OEM one, any x-former with same spec.
would do. Only matter is physical dimension for fitment on the board.
>>
>> The 12V 5AH battery also appears to be low, so, I'll get
>> a new one on the net.  The one thing I'm worried about is
>> the terminal sizes.

Again no meed to get OEM one. Take the battery to battery shop, they
will give replacement with same rating and size. If terminal is
different size, you can just solder wires onto it. Or replace clips on
the wires.
>>
>> In car batteries, the "series" determines if the battery
>> will fit (e.g., terminals on the side, or on the top, etc.).
>>
>> But I'm not sure *how* one scopes out prospective gel cells.
>> For example, here's an ELK which looks like it should fit:
>>   http://www.surveillance-video.com/elk-06120.html?productid=elk-06120&channelid=BCOME
>
> There are two sizes of terminals in that current range. 3/16" wide and
> 1/4" wide The 3/16" is common in low current applications, and the 1/4"
> in UPS.
>
>



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