I'm not sure I can handle 4 AAs on top of the camera and rig weight. One 9-volt, maybe.
If you re-read my post you'll see i said AAA batteries (triple A's) they are smaller and lighter than AA batteries ( Double A's). If the weight is still too much then you'll have to go with a 3 volt relay as Ron already suggested.
Thank you VERY MUCH for not only taking the time to reply, but taking the time to draw the schematic. According to the original schematic, it was supposed to be off for 30 seconds and on for 5. I would actually prefer something in the neighborhood of a shutter trip once every 60 seconds. What is your circuit set for?
If you take a look back at the schematic you'll notice ive editted it to match the components in your original schematic and ive also labelled the timing components so you can follow along with the calculations below.
You can find these formulas via a simple search on Google but i'll show them here along with my calculations to make things alittle clearer.
Pulse high time T1 = .693 (Ra + Rb) C
= .693 x (220,000 + 47,000) .0001
(Note that the resistor values have bin changed to OHMS and the capacitor value has bin changed to FARADS.)
= .693 x 267,000 x 0.0001
= .693 x 26.7
= 18.5 seconds high
This is how long the relay will be "off" and how long the LED will be "on", indicating that the output is in a high state.
But like Ron suggested theres really no need for the LED other than monitoring the circuit. For a longer "off" timing interval simply change Ra to a higher value and plug it into the formula above.
Now to calculate for the low time T2 = .693 x Rb x C
= .693 x 47,000 x .0001
= .693 x 4.7
= 3.257 seconds low
This is how long the relay will be activated , the relay contacts are closed and the shutter is engaged, the LED will be "off" indicating a low state at the output on pin 3. I dont think this length of time is really necessary which is why i asked about the 5 second shutter time.
My advice is that you should replace Rb with a 2.2 K resistor . This will shorten the length of time the relay is activated and save on battery life as Ron also suggested.