Now that I have mounted the yoke it is time to stick the Iconoscope in and see how well it sits in there and at what height it will be positioned once in. Firstly before that I had to cut away some metal from the rear of the enclosure big enough to allow for the tube to be inserted. I firstly cut away big square hole in the top rear of the enclosure and gaffer taped the sharp edges then attempted to put the tube in but it didn't fit, so I then cut a big hole behind the enclosure and tried fitting the tube but it didn't fit so I then cut the top rear corner off and that did the trick. I also had to remove the original tube mount as the tube was going to sit much lower. After all that I carefully slipped the tube in and it went in nicely, and I shoved a piece of foam underneath the tube's bulb end so it sits. The tube is lower than I intended so I am now going to look into modifying the lens carriage and use a different lens that's smaller and will project the image straight onto the tube's mosaic.
Next thing I decided to do is to get the high tension power supply voltage divider circuit off the breadboard and solder it all onto a circuit board, so I grabbed a piece of scrap circuit board and modified to accomodate the HT voltage divider components by cutting tracks and drilling holes and then soldered the components in nice and tightly together and here's how it turned out:
I then drilled some holes in the front right side of platform which the Iconoscope sits on and mounted the HT voltage divider with a piece of foam underneath on to it as seen below:
Now comes the heart breaking part of the project which is to dismantle my homemade vidicon to use its video and deflection circuits for this camera. I could of replicated the circuits but have too much on my daily agendas to make time for that so I unscrewed the two boards and cut the connecting wires and also removed 2 of the 3 transformers and all that's left of that camera is the power supply, a transformer and the tube/yoke:
So that's it for the vidicon camera, at least until I decide to put them circuits back and wire it up again. Now onto the next task which is to start working out where I am going to be mounting all the circuitry inside the camera's enclosure. Firstly I thought make a metal enclosure for the preamp so it is shielded from noise and position it as close as possible to the tube's target output. So I got a couple of lids from a couple of scrapped microwave magnetron enclosures and drilled some holes and mounted the preamp onto one lid soldering an earth connection between the preamp's earth and the lid. I drilled a couple of holes in the platform and mounted the preamp enclosure underneath as seen:
Next circuit I decided to mount is the video circuit as that's what the preamp will connect to so I drilled 4 holes in the video circuit board and the right side of the platform so the circuit is reasonably close to the preamp:
And then I drilled a couple more holes on the left side of the platform and mount the preamp's +/-12V power supply circuit to it:
So that's the latest progress on my Iconoscope camera project as of today, I am very happy I am progressing well with this camera, it's really starting to take shape! :D Stay tuned for more updates.
UPDATE 20/11/14!!! At this point in construction I was working out where to position the circuitry and power supplies and transformers and get it all wired up. I ultimately decided to place the video circuit inside the platform the tube is gonna sit on the right side and the deflection circuit positioned at the back of the enclosure at the bottom. Then I had to work out where to position the power supplies and transformers which at this point is up I was undecided, so roughly positioned them for the time being which would later change a bit.
Now it was time to start wiring up and interconnecting the parts. First things first I wired up the high tension voltage divider to an octal socket which will connect to the 1846 Iconoscope tube as it has an octal pin base. Then I started replacing the bullet connectors for the deflection and video circuit boards with header sockets and connectors as they are so much easier to plug and unplug.
Now it was time to determine the positioning of the transformers and the power supplies and wire them all up. The 3 transformers I positioned at the front and middle left and the high tension 1KV power supply I positioned middle right with the smaller power supplies glued on top with insulation between. For the mains I decided to cut out a hole in the bottom right back of the enclosure and stick a mains socket in for convenience of plugging in mains leads instead of a permanently fixed lead. After bolting the power supply and transformers to the enclosure and wiring it up it was time to test them out to make sure they are working and outputting the correct voltages. Powered it up "BANG" a capacitor in the small power supply I made for the video/deflection boards exploded. Turns out the bridge rectifier was misslabeled on the polarity so + was - and - was + so I switched it around and replaced the capacitor and all was good. Then I wired up the +/-12V power supply for the preamp and powering that up I saw the 7812 regulator smoke up, I then realized I wired the power supply back to front. I had to replace both 7812 and 7912 regulators they were screwed. Once that problem was fixed all was good again. So now all power supplies are now operational!
I decided next to test out the preamp again to be sure that it is working. So I took it out and powered it up and was disappointed to see a very noisy 8V p-p sawtooth looking waveform and when placing my finger on the input lead get a horizontal blurring response. This was the problem I had with the original preamp I made. I then thought perhaps the noise might be coming from the input leads themselves picking up stray radio waves, so I removed the little wires and the waveform was clean and responding vertically with noise when sticking my finger on the input, so the wire was the culprit as suspected. So I am now thinking on sticking the preamp straight onto the target output of the Iconoscope tube or using heavily shielded wire, if I connect it onto the target cap of the tube I need some firm clamping connector or solder it on though not sure on risk of damaging the tube doing that so will question my tech friends.
Now it's time to give some attention to the optical side of things. Last year I made a big rackable lens system using 2 magnifying glasses which at the time I thought suited the camera perfectly. Well after deciding to use a plumbicon deflection yoke and seating the Iconoscope tube into it I found the tube was positioned too low for that lens so I decided to make a new lens system made adaptable to the original rack railing. Being a lot more familiar with optics and old film cameras using small lenses to project big images, I thought using a single smaller magnifying glass would suit nicely and it did, it projected the picture nicely across the mosaic area with less aberrations than the 2 big magnifying glass lens system, only drawback was there's a bit less light coming in.
Now that I have a suitable lens, then I had to find a way to make it rackable and adaptable to the railing in the lens carriage so looking in my scrap metal parts I came across the casing of a 6V Eveready battery I disassembled and thought it would work good as a lens hood/carriage to slide back and forth between the rails, so I glued the lens in to one end of it with foam spacing between.