CCTV Cameras

[SUNRAY]

It will accept AC or DC anywhere between 12 and 24 volts, to power it.

Not quite, the markings clearly show AC24V / DC12V These devices are frequently just a single diode for half wave rectification and trying to run at 24V DC may possibly cause overheating, leading to failure.

12V DC or 24V AC, can be either...
Find yourself a 12V DC PSU.

Polarity is not marked so it makes no difference which way you connect it.

The polarity is clearly marked.

It may not work if reversing DC due to half wave rectification. Equally it may not matter if bridge rectified and you are if you're using a single local psu... but if a common psu for all cameras it's very important to observe polarity.

 

[sparkymarka]

probably still ok

 

[AstonHill]

If you just want to view the video to check the camera works, stick with the composite video signal from the coax.

No; Im thinking about using the SD card as opposed buying a box for it and all the wiring. But I still would like to test first wired onto a TV

 

[AstonHill]

It will accept AC or DC anywhere between 12 and 24 volts, to power it. Polarity is not marked so it makes no difference which way you connect it.

The earth terminal is for screening the camera from interference.

It's quite an old, though high spec security camera, but without a lens, it is useless. The lens probably included a motorised iris, powered by the camera. BNC can be fed to an older TV which has a SCART socket, or Phone A/V. I dumped several of them a decade ago - things have moved on.

Polarity is not marked; so I guess thats why it will run on AC as well. But when electricians wire these up, what do they power them with

Can you get replacement lens for it?
BNC to SCART socket, what is the BNC? I though this was a coax signal?
Why did you dump them? are they worthless?
Screening the camera from interface?

 

[AstonHill]

That camera is not that old ….maybe 7years old ! But again without a model number ?

I dont know which one is the modal number so I have just added a photo of it

 

[AstonHill]

Not quite, the markings clearly show AC24V / DC12V These devices are frequently just a single diode for half wave rectification and trying to run at 24V DC may possibly cause overheating, leading to failure.



The polarity is clearly marked.

It may not work if reversing DC due to half wave rectification. Equally it may not matter if bridge rectified and you are if you're using a single local psu... but if a common psu for all cameras it's very important to observe polarity.

It sound quite complex its power source! But am I OK to run with a typical car charger as this will be over 12V?

 

[AstonHill]

probably still ok

So they are worth something then

 

[Harry Bloomfield]

Can you get replacement lens for it?

Probably, but they will be very expensive.

BNC to SCART socket, what is the BNC? I though this was a coax signal?

BNC is the type of plug - the signal is 1v p to p composite.

Why did you dump them? are they worthless?

Old, worthless, more modern smaller ones, with better interface options.

Screening the camera from interface?

Screening from external interference.

 

[sparkymarka]

Don’t use a car charger ….they may be password locked ….

 

[RandomGrinch]

Polarity is not marked; so I guess thats why it will run on AC as well. But when electricians wire these up, what do they power them with

As has been mentioned, the polarity is marked with a + and -
...and a power supply such as:

1 Amp In Line Camera Power Supply | ESP (PSIL1W)

www.tlc-direct.co.uk

would probably be ok for one, or two cameras at most.

BNC to SCART socket, what is the BNC? I though this was a coax signal?

The BNC connector (Bayonet Neill–Concelman ) is a coaxial connector that (in this case) carries a composite video signal. This can usually be connected to your TV by way of a SCART to phono composite lead, or your TV may have a phono connector on the back that is coloured yellow, or green/yellow.
In which case you will need a phono lead and a BNC to phono adapter:

https://cpc.farnell.com/pro-signal/rw1-033/adapter-bnc-male-to-rca-female/dp/CN15992

...and as above, it still needs a lens and may be password locked!

...just looking at the datasheet, and it will also accept PoE

 

[sparkymarka]

The BNC “MAY” not be composite ! one of the spec shows CVI output from the BNC

 

[SUNRAY]

Polarity is not marked; so I guess thats why it will run on AC as well.

It most certainly is polarity marked; black = negative, red = positive. I haven't handled this model but others have the negative terminal connected directly to the camera earth as is the BNC socket, so it's essential the supply is connected correctly if there is any chance one side is at the same earth potential as the video and if the PSU feeds more than one camera they must be connected the same.

For completeness the yellow arrows point to the 2 supply options, unless the manual says otherwise it's 24V ac OR 12V dc, the data sheet seems to agree.
Data sheet: https://www.ipcamerasuk.co.uk/pdf/HF5421EP-Datasheet.pdf
It mentions "Video Output 1 channel BNC（1.0Vp-p，75Ω)" But as this is still a current model it wouldn't surprise me in the slightest if it's 4in1etc multistandard.

Look on ebay for lenses, a couple of years ago I picked up 3 bundles, total of 11 random lenses for <£20 delivered.

 

[AstonHill]

Don’t use a car charger ….they may be password locked ….

I dont understand what you mean?

 

[AstonHill]

As has been mentioned, the polarity is marked with a + and -
...and a power supply such as:

1 Amp In Line Camera Power Supply | ESP (PSIL1W)

www.tlc-direct.co.uk

would probably be ok for one, or two cameras at most.


The BNC connector (Bayonet Neill–Concelman ) is a coaxial connector that (in this case) carries a composite video signal. This can usually be connected to your TV by way of a SCART to phono composite lead, or your TV may have a phono connector on the back that is coloured yellow, or green/yellow.
In which case you will need a phono lead and a BNC to phono adapter:

https://cpc.farnell.com/pro-signal/rw1-033/adapter-bnc-male-to-rca-female/dp/CN15992

...and as above, it still needs a lens and may be password locked!

...just looking at the datasheet, and it will also accept PoE

So that charger should work then, dose that mean it is exactly 12V?
How do they password lock them, can you get the code from the manufacture?

 

[Harry Bloomfield]

So that charger should work then, dose that mean it is exactly 12V?
How do they password lock them, can you get the code from the manufacture?

I agree, don't use a charger. Depending on the type of charger - an older one will produce a very raw form of DC and the voltage will be uncontrolled. A more modern charger will not output any voltage, unless it 'sees' a suitable voltage from a battery at it's connections.