Canon EOS 300d / 350d DIY Remote Shutter Release

** See disclaimer at the end of this page **

This page was originally written over a year ago and shelved until now. Why? See a bit later on ;-)

This page details how you can construct a wired remote shutter release any Canon EOS camera that uses a 2.5mm jack plug. This work came about after I aquired a 300d as a spare body to the 10d. I had already bought the timed remote for the 10d (TC-80N3) and I wanted to be able to use this with the 300d or to construct a rudimentary alternative. Both were achieved, but this page details the simple DIY alternative.

The 300d uses a 2.5mm stereo jack plug for it's remote release. The operation is identical to the Minolta release detailed here.

Looking at the jack plug we have:-

C is the common connector
P is the pre-focus connector
S is the shutter release connector

So, to take a photo, we initially need to short pins C & P which will initiate focus and metering etc. We then need to short pins P, C & S to release the shutter. It was noted during development that shorting just pins C & S would also release the shutter.

The bits I used were as follows:-
2 push to make buttons
1 miniature toggle or slide switch *optional*
a suitable length of 3 or 4 core audio cable (twin screened is sufficient)
1 35mm plastic film cannister to house the unit (no DAT tape box this time around)

For a change, I actually purchased all the bits (with the exception of the film case) new, so actually know what the build cost is.... a grand total of £3.45.

Given that the genuine article costs around £15 (UK) or $13 (US) and non Canon remotes can be bought from eBay (user: wenatrado) for only £6, I'm not convinced the effort is actually worth it, however it does lay the foundation for a much more interesting project.

The circuit (for what it is) is presented here:

The optional switch (S1) is there to save holding the shutter release button (B2) in all the time when taking Bulb exposures. It can be omitted if you like.

For those that would like the shutter to be released only on the pressing of both buttons, the circuit can be varied slightly (note the new order of the 2.5mm jack connecters):-

Here, for the shutter to release, B1 (or S1) must first be closed before B2 will operate.

The finished article looks like this:-

No doubt a sub miniature version can be constructed, but I was interested in seeing just how little this could cost by using shop bought components and a readily available 'free' case.

Definition of Common - this is my definition as during development, it was noted that if the pins P & S are connected, the shutter will fire. To comply with the way that the TC-80N3 works, the above circuit requires both buttons to be pressed before the shutter will operate.


Neither myself,, my family, my friends, my pets or my leach farm take any responsibility whatsoever for any damage caused to anything or anyone by duplicating what I've done. If you feel confident in not destroying your expensive digital imaging equipment by trying this little ditty, that's your choice and not mine.

v1 24th June 2006  

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