Pulse Sync Interface

[#Pedro]

For anyone who is interested in an interface to record camera flash contact pulses to a free soundtrack of any recorder, here is the circuit diagram.

The input is designed to be connected directly to the flash socket of any camera

The mic output provides an 1000 Hz pulse signal with an adjustable level of about 5 mV for any microfone input.

The freehead output provides a 0 dB signal for the 1000 Hz pulses and a 2V DC-voltage between the pulses in order to erase old pulses on the tape. It can be connected directly to any sound head coil of about 560 Ohms, without any other amplifyer or electronics between.

This jpg file will remain for free downloading for 7 days on my xdrive, as I have no homepage.

A layout to assemble the circuit on a 3x4 cm board with smd components will follow.
The circuit is tested and works very fine.
Any questions, feel free to contact me.

Pedro
http://www.xdrive.com/share/98313767...NLrYl0ojvc7d6t

[Alex]

Well, I downloaded it! I didn't have enough memory to print...but I see it on my screen!

Alex

[#Pedro]

Alex: Best you open it using a software like the MS photo editor (included in the MS office package). Then you can resize it as you want and print it, or copy/past to any other office application.
Pedro

[Alex]

What if I'm Mac based?

Alex

[pcg]

Alex,
You should be able to read the file on a Mac from either PhotoShop or Canvas. I had no problems bringing it up! I'm running a G4 & OS 9+. PhotoShop 5.5 read it fine...

/Pat

[#Pedro]

I wanted to make it as simple as possible and transformed my original file (made in quicksilver into jpg grafics, supposing that anybody could open this. Jpf and gif are the two grafic formats, which can easyly be inserted in any html based internet site.
If anybody of you is interested in another format - please email me and I will send you the file. Maybe imbedded in a Word or Powerpoint document, maybe pdf (acrobat reader file), maybe the original quicksilver (=interleaf) file...
I think the file format should not be the problem with double system sound ):
Pedro

[pcg]

Pedro,

Every current OS I know of, whether MAC or Windows, has a built-in reader for .jpg or .gif files. They don't require anyone to own expensive graphics software, so reading the file should be easy. I wonder whether Alex making be running an older Mac...

/Pat

[#Pedro]

To Everybody who is interested in the complete diagrams of the interface, check out the following 3 links to my xdrive. They will work for 7 days for free download. There is the actual circuit diagram, now with an additional line output, the layout for prints on photopositive boards, and the population diagram with testing instructions.

Pedro
http://www.xdrive.com/share/98382997...psKi3Vsa1olrtv
http://www.xdrive.com/share/98382999...owPBHhpx4uYsdX
http://www.xdrive.com/share/98383106...gapyJa48b0IXPN


[This message has been edited by #Pedro (edited March 05, 2001).]

[Konton]

I have also published these images here (with permission of course):
http://www.super8mm.net/html/1000hz.html

[#Pedro]

Interested in a low budget synchronizer to complete the pulse double system sound equipment?

Here is how it works:

You make your shots as usually, as your camera was loaded with a sound cardrige. You can use ANY framerate, even 18 fps. Flash contact connected to recorder, using my interface. Depending on the project, start the recorder a few seconds before shooting and stop it right afterwards (maybe coupled automatically) or let it run to record all the sound between the shots, too.
You need no clapboard or ath else!

Get your film developed.

Connect the recorder to the synchronizer (master input), connect the projector to the synchronizer (slave input and slave regulation output). Switch the synchronizer in OFF positon.

Load the film and forward it to the first frame in the gate.
Load the tape and rewind it.

Switch the synchronizer in SYNC position and the projector in RUN position. (The projector won?t run at this time, the synchronizer is already blocking it)

Now start the tape. When the first sound szene comes, the projector will AUTOMATICALLY start to run, it?s lamp will go on. The film will keep automatically in sync with the sound. A delay of up to +/- 128 frames will be corrected without loosing sync.

When the sound szene on the tape is over, no pulses anymore, the projector will stop automatically and the lamp will go off. The sound will keep playing. The projector will start to run again when the next sound szene is going to come.

You see, its simple to handle. You only start the tape and the projector follows, starts and stops. You can transfer the sound from the tape on the sound stripe of the film during this process, or first make your final cut, record music without synchronizer and as a last step overlay the sound szenes with the synchronizer, szene by szene.

When you swith the synchronizer in position SOUND TRANSFER, it will output 1kHz pulses to the tape, following the speed of the projector. This way you can make backup tapes of your sound stripes, refresh the sound with an equalizer and transfer it back to stripe in SYNC mode.

In SYNC mode you can connect the flash contact of any camera (or equivalent output of an video camera or crystal oszillator) to the master input, and the projector will follow the other camera or the crystal. So you can make flicker-free copies to film or video.

Or you can run the projector crystal synced, transfer the film to hard disc and add sound in any video editor, convert the soundtrack to wav and transfer all back to sound stripe, or tape, or CD...


You see, this small item is resolving nearly all problems you have with double system sound and gives new possibilities.
Well, the synchronizer is ready, I?m finalizing the circuit diagram to publish it.
I also have a compatible universal motor control unit for any DC projector motor, with lamp controler.
I?m working now on a low cost crystal oszillator for 18, 24 and 25 frames per second.

Pedro