Blown Transformer

[RobB 0]

I have an Eyeview external dome camera. When purchased it came with a transformer enclosed in a weatherproof box - Eyeview Electronics Model QA-307.

 

Inside the box is a 240VAC - 24VAC toroidal transformer and what appears to be a balun. The box and balun are intact - it is only the transformer that is burned out. I have contacted the company I bought the camera from and they have said I will need to buy a completely new unit (which is quite expensive) - however this seems like a waste of money when the balun and box are still intact and I have adequate soldering skills to wire a new transformer.

 

Unfortunately, when the transformer burned out the sticker with the voltage and current ratings was burned badly also - all I can make out is that it is manufactured by Lung Ho Enterprise Co Ltd.

 

Does anyone know which transformer I need?

[NOWIN 0]

NO ONE TYPED LOL JUST WING IT

[Soundy 1]

You already have the voltage requirements: 240VAC to 24VAC. Find the current requirements for the camera itself and make sure you get a large enough transformer to supply it (derate by at least 50% to be safe - ie. if the camera wants 1A, use a 1.5A transformer).

[RobB 0]

The trouble is, I have no way of knowing what the current requirements of the camera are. I didn't install it so don't know the model and it is mounted atop a 25ft girder that I cannot safely lean a regular ladder against. Also, the end of the girder has been set in concrete so there is no easy way of taking that down, either.

 

I have bought a replacement toroid - 2x115v primaries, 2x12v secondaries.

 

I wired the 2x115v primaries in series for the mains input, and the 2x12v secondaries in series for a 24v@1.67A output. When I read the output with a multimeter it is showing around 26v - would this be within tolerance for a typical PTZ?

[Soundy 1]

That should be fine, yes. There will be voltage drop over the length of the wire run anyway.