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AYahoo

Member Since 23 Oct 2012
Offline Last Active Jan 28 2014 10:06 PM
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Posts I've Made

In Topic: Olympus PEN & OMD Flash mod to reduce recycling time & battery

15 January 2014 - 11:02 AM

I've opened it up also... I'm trying to see the writing on the chip with no success...  Clownfish do you a pic of the circuit? I'm attaching mine... but I can't seem to see what is written on the main chip (looks like a small microcontroller).

 

P1015549.jpg

P1015557.jpg

If we look at the connector from left to right top row first then.

 

1 - NC (Not Connected)

2 - NC

3 - GROUND

4 - NC

5 - NC

6 - NC

7 - NC

8 - NC

9 - NC

10 - NC

11 - NC

12 - NC

13 - NC

14 - ??

15 - ??

16 - GROUND 

17 - ?? (Connected also to 30)

 

 

 

18 - GROUND

19 - NC

20 - NC

21 - GROUND

22 - NC

23 - NC

24 - GROUND

25 - NC

26 - NC

27 - GROUND

28 - NC

29 - NC

30 - ??

31 - NC

32 - ??

33 - ??

 

So there are 5 pins working... 14,15,17 (30), 32, 33 So who will lift the glove to do the reverse eng...


In Topic: Olympus PEN & OMD Flash mod to reduce recycling time & battery

13 January 2014 - 12:14 AM

I Haven't received the capacitor yet, but I'm thinking about implementing a cell phone led flash... this will be the easiest (I think :)).


In Topic: Olympus PEN & OMD Flash mod to reduce recycling time & battery

08 January 2014 - 11:16 PM

Hi Guys, I was a little bit busy lately, but I'll try to answer some of the questions...

 

I am not sure if I understand the graph, but I assume the y-axis is capacity and the x-axis is time (it would help to have a scale :-)

 

My bad, the Y is V (each div is 50v) and the X is time (ms).

 

Thanks for the test and info, I saw your thread only now but it is very interesting.

...2 if you limit the energy of a flash by the capacitor, you will loose out one the maximum possible duration (power)

 

I'm interested to know how the electronics of the flash looks like and what pins they are using if you have any pictures?

 

...However your TTL experiment is interesting, As well a quenching the flash tube, the camera can quenche a LED or laser.

 

Cheers

/O

 

I think you are semi right about the "loose out one the maximum possible duration" assumption, since the camera doesn't know the size of the flash installed, and the size of the strobe setup (can be 10 external strobes working together) this is the key feature that you are missing, I can install a very big flash on my hotshoe and still get a correct exposure of the image. so I think the Olympus Eng. deiced to use the size of the capacitor that will get a good coverage of daily use, since we are not using the same setup as they predicted (external strobes), we don't need that big of a capacitor, I did many tests will all kind of capacitors, I think that the magic number is around 30-50uf, I've used the 30uf and during the test only one extreme situation was under exposed compared with the original (f22 1/160) with big distance to the object, so I've ordered the same brand and same specs as the original capacitor but 50uf to test and check (I will update when I will get it).

 

Regarding the pins, I was also interested, but I didn't get there, I still have it disassembled and I might have time in the next few days to check it.

 

Other than that, I will try to update soon, but I took my friends RX100 MK2 and disassembled it completely, it had two capacitors 1x48uf and another 33uf connected in series, so 81uf total, again tried many settings ended up with 1uf capacitor to only trigger the external strobes, NO TTL! but we managed to take 2-3 photos per sec compared with 1 photo every 4 sec with the original, so about x10 faster. (didn't check battery consumption but I'm sure it will be much better).

 

Last but not least, I've tried to trigger a led, to check if I can get better results, but I had some success but not enough time to investigate it properly.


In Topic: Olympus PEN & OMD Flash mod to reduce recycling time & battery

10 December 2013 - 12:40 PM

OK, so I finally had sometime to check what is going on with the TTL.

 

I thought that the problem was that the capacitor is not big enough to supply the "full" duration of the pulse needed, so I setup a small test to verify it.

 

I will not upload all the info & data, since I don't think it will interest anyone, I'll cut to the results (if anyone want the full report, contact me).

 

This is the setup:

A small circuit board with 4 capacitors on it, Original 102uf, 10uf, 22uf, 33uf, A small dip switch to select the current capacitor.

And a OSC connected to see the signals.

Attached File  IMG_20131210_215652.jpg   125.83KB   53 downloads

Attached File  IMG_20131210_215702.jpg   74.17KB   62 downloads

Attached File  IMG_20131210_215725.jpg   66.54KB   60 downloads

 

Also about the preflash that we've talked about:

NO TTL, full flash:

Attached File  102Full.jpg   50.86KB   56 downloads

 

TTL ON:

Attached File  102FullTTL.jpg   51.23KB   60 downloads

 

You can see the small pulse before the flash, this is the preflash.

 

33uf NO TTL, full flash:

Attached File  33Full.jpg   48.28KB   59 downloads

you can see the fast charge time.

 

OK, so if I cut to the chase, I've tried all the capacitors with different settings on the camera, the 10uf was always underexposed.

the 22uf worked well until the f18, this was the maximum that I was able to achieve with the correct exposure.

and the 33uf gave exactly the same results as the 102uf.

 

if we compare timing (charge to full):

10uf: 350ms

22uf: 1662ms (or 1.6 sec)

33uf: 1277ms (or 1.2 sec) (I think the difference here is due to different manufacturers, you would expect this to be longer than the 22uf).

102uf: 3796ms (or 3.8 sec)

 

I can upload the images of the test if anyone wants.

 

Conclusions:

I think that if you wish to use TTL than cutting down from 3.8 to 1.2 is good enough preserving the TTL signal, I'm sticking with the mod for now :).

 

If you don't use TTL (god know why) than you can go even lower than 10uf, I think even 1uf, this will give you very good results: super fast & low battery usage. (on second thought you can use 1/64 flash, so maybe 10uf is enough).

 

I'll soon be testing it on RX100 ii that my friend is asking me to MOD to allow faster shooting, I'll update you all.

 

Have fun!

 

 

 


In Topic: Olympus PEN & OMD Flash mod to reduce recycling time & battery

09 December 2013 - 12:28 PM

Hi Nir, the E-PL3 does output pre-flash, I have it tested, and I will post some of the findings later.