You will require:
1x 2.5mm 4 Pole jack
1x 36k resistor
1x 3k resistor
1x 2k resisor
2 switches
2 core wire
Small box
Soldering iron + solder
Information is provided to aid users to create their own shutter release cables.

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He's developed a PCB which was 1.6cm - 0.9cm with SMD components on it. We've used a double action PCB switch which can be easily pressed with your thumb.
The remote works like a charm and it's very compact.
As a safety measure we've sprayed plastic spray over the PCB (covered the switch so it wouldn't get stuck) and then we've wrapped it up in shrink hose. In the shrink hose we'd first cut a hole for the switches pressing button.
Felix
I'd like to use an optocoupler but I don't have the camera with me...
Is it towards the base of the connector or towards the ring?
Thanks in advance!
Michael
Dang thank God I found this post!!! Tried making a remote shutter for FZ100 and it didn't work... All because I didn't know that it needed some resistors to power up! Will this series work on FZ100? Don't wanna fry up my camera.. Thanks!!
Switch for half press, red button for full press.
Did you end up getting this to work? I have just bought a GH1 and want to try it out but you said you had some problems with your setup. Are there any tips you can give a fellow GH1 user or should I just follow this instructable?
Thanks.
I'm waiting for a few optoisolaters to arrive and will then resume my quest to build a great intervalometer for the GH1. :)
Good luck Frakenegger! If you have questions, feel free to email me through OnEnsemble.org .
I should have looked at the dates on the replies. Can't wait to try this out!
Thanks.
On eBay they sell a remote that works for: Panasonic G1, GH1, FZ30, FZ50, L1, L10, DMW-RS1 and I know DMW-RSL1 uses the same as DMW-RS1 and I know FZ20 uses the same as FZ50.
This suggests this circuit should work for quite a lot of Panasonic cameras.
Just what I need!
I was trying to get the camera to respond to a 5kohm resistance (as it sees during a half-press) and the camera would do nothing. The trick is that the camera first has to see the 41kohms of all three resistors in series. I guess the camera uses 41kohms to indicate there is a shutter remote plugged in, then 5kohm to indicate a half-press, then 2kohm for a full press.
Thank you for this info, Xyzzy!