The same effect is seen even when using 8AA batteries instead of the pc power supply :/
Insanity: doing the same thing over and over again and expecting different results.Albert Einstein
a quick scan of the resultant pages didn't see anything helpful to the current issue (well maybe if a capacitor the size of a microwave oven is used). If the OP can't change the power supply or make any modifications to his current setup, his project is toast.
The wires from the power supply may be too small to pass sufficient starting current to the motor resulting a brownout of the camera. Particulalry if your AA batterys are in one of those radio shack battery holders, that could be an issue. If the cam could operate at 11v instead of 12v, then a diode in the cam + wire with a big capacitor between the diode and the cam, your problem might be solved. If you can't change any thing, then note the below.
Even connecting an uncharged capacitor will cause the video to momentarily flicker.
the power supply isn't the problem from what my experiments have shown. Even when using batteries, the same action still causes the camera brown-out.
A brown-out indicates that the power supply (and regulator, and the circuit connecting all this to the load) isn't capable of supporting the load being placed on it.
Yea but that doesn't explain why the normal batteries have the same problem. I understand the use of the Main capacitor, to get rid of any voltage spikes or dips. But if the power supply doesn't have enough current to supply to everything as it is, then the capacitor won't have enough charge to do its job.
Yeah, if the power supply can't supply enough current, that's certainly needs to be fixed. I thought OP was using a huge old PC supply.
I imagine there's a lot of brownout protection cktry inside the computer box.