Question about Homeland Security Cameras Home Security
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Posted on Jan 02, 2017
need to know what wires do what on security camera ive bought at car boot wires are 2 black 1 yellow 1white 1red would make my day if you have an answer thanks
Posted on Apr 08, 2011
So I have a 4-wire video doorbell. A bit old. According to the back of the doorbell unit, the four wires are V-Out (assume video out), A-Out (assume audio out), +B (assume Button), and -GND (assume ground). The camera and the infra-red LEDs need power when the video is switched on. The unit supports two-way audio and so there is a speaker and microphone in the unit. The microphone would obviously use the A-Out and Gnd, the camera the V-Out and Gnd, and so I assume the +B provides power to the camera, and LEDs (except when the button is pressed?). A small red led is always on, suggesting power is always available along the +B and -GND to power that.
I assume also that the "receiver" works by sensing the button is pressed (a different resistance in the circuit?) and then it switches on the video display and allows the microphone to on the unit to be heard at the receiver for the 180 seconds that it stays on.
Given the instructions and the limited wires and analogue simplicity, I would say the unit always draws 14W because the camera and microphone and the LEDs are always on and transmitting.
I just don't know how the audio signal is transferred back to the speaker...
On my unit, the green wire is V-Out, yellow is A-Out, red is +B and brown is -GND.
Posted on May 15, 2011
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