If so, you'd need another 0.7 volts or so for your input.
The output voltage of the Canon power supply is 3.15V or 3.2V, so no need to increase the supply voltage much above that.
@Pier:
- The wire of your power supply should not be too long, and the copper diameter should be adequate to minimize the cable resistance.
- Have you tried to measure the current draw of the camera during the tests with the external supply?
If there's no current, then something is not connected. The problem may be either (in) the plug, or something inside the camera.
- The power input jack may not be wired directly to the battery compartment, but in case it is, the 1kOhm may be sign of a fault (and the reason why your setup doesn't work).
- The ACK800 supply is used for a lot of older Canon cameras too (those with two AA battery). If you have one (older Canon camera operating from 2xAA battery), you could prove your power supply is working.
Someting is wrong in my SX130Is after the center pin on this DC external jack.
You could try to stick that resistor (6 Ohms) into your plug, the plug could be faulty too.