Success PC Port output on HVL-F7S (Sony NEX) without PREFLASH!!!

Started May 21, 2012 | Discussions thread
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fabianbono
fabianbono Regular Member • Posts: 190
Success PC Port output on HVL-F7S (Sony NEX) without PREFLASH!!!

After a lot of reading of web pages, forums, and with some help from the user OWHK, I successfully modify my HVL-F&S flash of my SONY NEX C3, to provide a PC Port Sync cable to trigger external flash WITHOUT PREFLASH!!!!

And the best is that works no matter the Sony Flash is ON or OFF (Up or Down).

It triggers only on main flash strobe, so is perfect to trigger an external flash, or a wireless trigger.

These are the sources of information I use:

A useful mail sent by OWHK, with detail information about how to get the SYNC signal.

http://nex-hack.blogspot.com.ar/2012/01/about.html
(The base of the circuit to amplify the SYNC signal.)

http://kundweb.netatonce.com/~u23400/Dismount.htm
http://info.xitek.com/product/201203/12-75575.html
(How to disarm the flash unit)

http://forum.xitek.com/forum-viewthread-tid-970489-ordertype-1-highlight-f7s-page-1.html
(The real source of information for the success!!, thanks Google Translate)

The below pictures shows you the pins to use, that is SYNC and GND (OWHK, check that is different from your suggested LGND).

The basic circuit to amplify this signal (and protect camera at same time).

I use all 4,7K Resistor, so use 3 to build 15K, but values not need to be exact.
5K can be up to 10K, and 15K up to 47K.

REMEMBER TO DISCHARGE THE CAPACITOR WITH 1K RESISTOR BEFORE TO WORK WITH THE BOARD.

The point chosen to make the cable connection (better than near 14 pin connector...)

The small box to keep the circuit and cable connection.

Later will take some pictures using this combo, but the test was very successful.

 fabianbono's gear list:fabianbono's gear list
Sony Alpha NEX-C3 Nikon D5200 Nikon AF-S DX Nikkor 18-105mm f/3.5-5.6G ED VR Nikon AF-S DX Nikkor 35mm F1.8G Sony E 18-55mm F3.5-5.6 OSS +8 more
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