Joaquín de prada in Opensx70 2minutes

Prototype#7 & Seeed!

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So finally I have prototype#7 working!! This is the first picture I have taken, EV10 (it was really late, but the mirror delay really helps keeping slow shots steady).

When I had the new PCBs from SeedStudioFusion, I tested all that I could test before assembling the camera: and it worked.

Then I assumed all was good. BIG MISTAKE!

As the saying goes, fool me once shame on you, fool me twice shame on me! Well… not exactly, turns out that the first time they f—ed up they gave a generous coupon, so this time the PCBs were almost free.

But still.

I mean I have already sent two boards to people, I was so eager to share them… What are they going to think?

I build prototype#7 out of a beautiful chrome Alpha SX70, when tested it and the shutter fails of course I assumed that the 50 year old camera was to blame. Even thought I had tested the basic operation of the candidate camera… I might have missed something.

So I go to Menorca thinking it is me or the camera to blame! Prototype#7 was on the back of my mind…

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So first thing I do on returning is troubleshoot prototype#7. I power solenoid#1 directly with 5.8V from the lab power supply: works perfectly: so by now I am begining to think that there is nothing wrong with the camera.

Next I should replace the mosFET chip in the PCB by the specified one.

I had indicated in the BOM file (Bill of Materials) that the mosFET apropriate for the solenoids (both) is AO3404. Nothing fancy really. Marked “A09T”.

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I remembered that the last time Seeed had replaced that for another one, it was different and I didn’t like it was bigger but it worked: (x4NX 11)

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So I wrote them a note with my order:

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But they replaced the mosFET for a different one: X4RX 13

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And it seems this mosFET is not optimal (so to speak) for the SX70.

They sent me a mail with questions about some components and their placement and I had a good feeling this time, but not really.

By the way, I have only replaced the mosFET for solenoid#1, so I wonder if flash will work correctly or I should also replace the mosFET for solenoid#2. I probably should!

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I am not going to say what I think (!!!!!), let only be known that it shouldn’t be so difficult to manufacture a PCB. In fact I have also manufactured the much simpler FTDI boards and they seem to work perfectly!

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Now that I have complained to them, lets see what they have to say. I am really really pissed this time.


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