This new timelapse
circuit is much simpler than my first one which had an IC Atmega8, a voltage regulator for the camera, a light sensor to interrupt shooting at night, and of course a potentiometer to set the interval. That was a complicated project (for me) and there was too much chances to make some mistake in design and construction.
I then decided to design this new circuit, this time very simple, which doesn't need any microcontroller, is connected to an IR remote (mine is for Olympus Camedia bridge camera, but you can find similar ones for almost any compact and DSLR camera) and it includes a simple voltage regulator only to supply the IR remote control. Digital camera should need its own PSU (or battery, but it should be a very powerful one for a timelapse). So the TIRR was born!