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A couple of the very best cameras on the market, actually offer both 12v DC operation or a line powered option, simply by choosing the appropriate power supply unit, and flicking a selector
A quick but important point to note; if a power feed is picked up for a 24 hour covert operation, some buildings shut down specific power circuits at certain times of the day (e.g. the office lighting may automatically switch off during the night), so whatever you do, make sure that the supply is constant or alternatively backed up with a small independent battery source, for continous operation.
An example might be a mains derived 12v DC supply during the day, which switches over to battery operation automatically (cells which are trickle charged from the daytime mains supply) when the power is turned off at night.
After power supplies, the next and most obvious problem is how best to get the pictures from the camera to the recording or monitoring position.
Its worth considering that for convenience in some situations, the recording point may be hidden away in a services cupboard or spare room, whilst the monitoring position could be positioned at a completely different location, such as the Security Managers desk, or a temporary police operations room.
Doktor Jon will now briefly help you explore some of the various options for bringing the CCTV pictures home.
A simple application such as a bag or suitcase operation, may not actually require any transmission at all. Their are a number of small and discreet recording devices on the market now, which will easily allow the entire system to be contained in a single bag, even a handbag, if you are so inclined.
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