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Power adaptor has been changed
on 22 February 2012
I bought one of these power adapters for my Megasonic Defender cat repeller two years ago. It was a conventional transformer type power adapter. Both products have been working fine ever since they were installed to keep my lawn clear.
This week, I ordered another Defender and power adapter after a cat had started fouling another area. Although the packaging and part number for the power adapter are the same (STV612), after studying the new documentation, it looks like STV have introduced a completely different mains adapter perhaps some time from October 2011 onwards. It doesn't resemble the one on the box packaging, and the pictures posted in this Amazon UK listing.
Specifically, it is a light weight switched mode power adapter, the sort that is frequently supplied with mobile phones and other gadgets nowadays. And we know how reliable they are....
It comes with a snap on adaptor to allow it to be used with UK 3 pin or European 2 pin mains power socket.
I may be being pessimistic, but experience has shown switched mode power supply adaptors often frequently have a shorter life span than conventional transformer type designs. I wouldn't be surprised if I have to replace it after only 2-3 years. There is no mention of warranty conditions with the product, so I can only presume it is only for 1 year.
Only time will tell, and I hope I will be proven wrong. I will report back in 2014 !
Fwiw, alternative universal DC power mains adaptor will also work. Provided it is rated at 9 volts DC at 500mA (The Defender draws a mere fraction of this current) and has a 5.5mm (out diameter) 2.1mm (inner diameter) barrel plug fitted, with centre hole being Negative polarity.
The kit comes with 5 metre extension lead. If you need a longer lead, try looking on a certain well known auction site and search for:
2.1 extension lead
5m and 10m extension leads are available.
Hope the information is useful.
Update: June 2015.
Well, it's been more than 3 years since I installed this power adapter. I can confirm it is still working.
I should also add my other older 'transformer type' power adapter is still working too after 5 years.