Just got the LNtech LN300R 960H NTSC video cam. This toy is using Exview HAD II type-1/3" ICX672AKA CCD.
Here is the inside on the main board.
There are 3 cords connect to the back board.
4 PIN cable: it's for lens control. For practical purpose it's not useful in our field. It will be removed.
3 PIN cable: 12V Power (RED), Ground (BLACK), and RS170A Video out (YELLOW).
2 PIN cable: to handle top-down-left-right-center buttons, using resistor matrix. <-- Black-White cord
Some interesting circuit observations:
1) 2-wire control (I'll show a DIY, posts #4-#11). No need to bother RS485 type of control.
2) RJ-11 DSP/CPU is used
3) AD9943 10-bit A/D AFE
4) JRC's NJM2274 (Y + C combiner) to form composite video output. In another word, this camera can send out S-video, if a slight change is made.
5) probably 74AC07 (JRC again) to drive lens-drive signals
6) IR-cut output (to drive a solenoid to mechanically move-in/move-out IR-cut filter) is unpopulated and is optional.
In post #12, I'll describe my general observations on its image accumulation part of design and software-based image summing.