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This oscilloscope clock uses a purely analog signal to generate the circles, arcs and lines that create the characters.
33 backers pledged $9,282 to help bring this project to life.

About

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$9,282

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A picture is worth a thousand words !
A picture is worth a thousand words !
OSC4.7 Analog Oscilloscope clock with DG7/6 crt.
OSC4.7 Analog Oscilloscope clock with DG7/6 crt.

 My project is a homemade analog oscilloscope clock, similar to my previous designs but differing in the manner the display is created. The segments which make up the characters are generated as a continuous line, arc or circle by using an analog switch and digital potentiometers and rheostats controlled by a microcontroller to manipulate an analog signal (sine wave) from an oscillator. This is quite different from my previous method of using vectors (dots) to draw the display point to point. The board has pots to adjust vertical & horizontal height / width, focus, astigmatism, brightness, and vertical and horizontal centering, as well as oscillator shape, oscillator gain and phase shift.

Close up showing the segments of lines, arcs & circles that form the characters.
Close up showing the segments of lines, arcs & circles that form the characters.

 It starts with the same basic design as my previous models, using the same type supplies for high voltage & low voltage, the same wave shaper to pick up and convert 60/50HZ and the same blanking and deflection circuitry, with some slight changes. The new method of actually drawing the display begins with an oscillator configured to generate a sine wave which is switched by an analog switch to the deflectors, and positioned & sized by the digital pots. The microcontroller programmed with my firmware handles all this amazingly well !

The first reward: A kit for DIY, includes the pc board, transformer, wires and components to populate the board, and the preprogrammed microcontroller & IC's. BYOCRT (bring your own crt) @ $145 or greater pledge.
The first reward: A kit for DIY, includes the pc board, transformer, wires and components to populate the board, and the preprogrammed microcontroller & IC's. BYOCRT (bring your own crt) @ $145 or greater pledge.

The kit comes with everything you need to build it yourself, except the crt and an enclosure. It should work well with most small relatively low voltage crts, as in my previous kit version. The kit will be a really challenging build, which will make it the more rewarding to the builder who is able to complete it and adjust the controls to optimize the display ! As always, I will be available for Q & A and ready to supply any docs I have for different crt types. It is also possible to exchange the microcontroller for a new one with upgraded firmware, since the IC's are all in sockets. 

The $285 reward - a standard fully assembled OSC4.7 oscilloscope clock with a DG7/6 3" diameter screen crt. including shroud or dust cover (not shown)
The $285 reward - a standard fully assembled OSC4.7 oscilloscope clock with a DG7/6 3" diameter screen crt. including shroud or dust cover (not shown)

The deluxe version will be built using the pledger's choice of either the DG7/6 or the very nice DG7/12-C which has very high quality resolution & focus as well as gold-plated electrodes. I will use gold pin sockets and the $345 or higher pledge will also come with a future firmware upgrade (when available) and for any pledge $500 or more I will build the deluxe version with any type of crt the pledger chooses as long as it is possible.

The $345 or more pledge is for the choice of the analog scope clock built using either the DG7-12C crt (pictured here) or the DG7-6, with gold sockets & future firmware upgrade.
The $345 or more pledge is for the choice of the analog scope clock built using either the DG7-12C crt (pictured here) or the DG7-6, with gold sockets & future firmware upgrade.

 I would like to produce a run of a hundred boards or more with this design. I currently have a prototype run of four boards and will need to make another prototype run to correct some minor errors first.

The 6Lo1i crt also works well with the OSC4.7 board.
The 6Lo1i crt also works well with the OSC4.7 board.
A scan of the professionally made second prototype pc board.
A scan of the professionally made second prototype pc board.
A work in progress - the future firmware upgrade will be a clock face with hands, which would alternate every ten seconds with the digital display.
A work in progress - the future firmware upgrade will be a clock face with hands, which would alternate every ten seconds with the digital display.
This is the silkscreen & component layer of the finished version.
This is the silkscreen & component layer of the finished version.

Some points of interest: All the components on my clocks / kits are replaceable/repairable because they are all standard size, not SMT The IC's or "chips" are socketed so they can also be replaced easily, even by the layman In many cases, I will repair the clock free for any reason if you ship it back to me - i.e., if a component fails or is damaged (except the tube(s)) All of my clocks use standard electric service (do not need a separate power supply) and most can be set for 120VAC (U.S.) or 240VAC (others) Instruction set for scope clock ______________________________ When plugged in, the blue led should light immediately, and there should be a small "click" of the relay engaging. After several minutes, the filament should warm sufficiently and the screen should display "1", (number one). This means 60HZ was detected, and set accordingly. If a zero appears instead, then 50HZ was erroneously detected (unless your country uses 50HZ mains of course). Unplug, wait until the blue led goes off, and then plug back in. The time set buttons are a pair situated close together, one is fast set, and the other slow set. To set time without programming any preset on/off times, just press the slow set button (on the left) once and the clock display should appear, then use the two buttons on the front to set time. To manually turn the display on/off, press the toggle button (separate from the two set buttons). To program the preset on/off times: First press slow set to enter normal timekeeping mode, then press the fast set & slow set buttons at same time and the screen should display 12:00:00. Press the fast set button to increment the hours. Each time that button is pressed, the hours should increment once. When the desired hour is shown for ON time (AM only), Press the toggle button to advance to the next screen and the display should change again to 12:00:00. Follow the same procedure, and after the OFF time is selected, either press slow set to enter normal timekeeping (fast set / slow set) mode or, to set the second set of preset on / off times, press toggle and follow the same procedure, except this time you will be selecting first a PM on time and then an AM off time. Please refer to the youtube link for illustration: Note: The clock will display 12:00 AM to start, so if the present time is after noon, you will need to advance the time past 12:00 in order to reach the PM hours, else the preset on/off times may be reversed. I.E.: if the present time is 8:00 PM, you need to advance PAST 8:00 once, and then stop at 8:00.

Assembly Instructions

Parts List

A place to buy some crts: http://www.sphere.bc.ca/test/crts2.html

Risks and challenges

Designing the circuitry to drive the analog portion of this clock was challenging ! I wanted everything to be as simple as possible and to be driven by a single 5VDC supply. I also wanted to fit the entire circuit on one board, and that board to be the same size as my previous mini scope clock board, OSC4.3. The risk of doing it this way would be not to sacrifice the quality and still keep the cost down. Overall, I am very happy with the design. I plan to continue to work on the firmware to create an analog clock face in the future to alternate with the digital display as in my previous design.

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  1. Select this reward

    Pledge $145 or more About $145

    Build it yourself ! The OSC4.7 kit includes the pc board, transformer, wires, components to populate the board and IC's including the preprogrammed microcontroller. You can source your own crt and build your own enclosure. Many small relatively low voltage crts will work if similar to the DG7/6 or DG7-12C types. This is a really challenging DIY project but can be very rewarding to the builder in building it accurately and adjusting & tweaking the controls to optimize the display.

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  2. Select this reward

    Pledge $285 or more About $285

    A fully assembled clock with homemade plexiglass case including the 1/4" thick base and 1/8" thick shroud or dust cover. Uses the 3" diameter by 7" long DG7/6 crt. Easy to set for 120VAC (standard U.S.) or 240VAC (some other countries) and automatically sets for 60HZ or 50HZ.

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  3. Select this reward

    Pledge $345 or more About $345

    The deluxe edition ! Fully assembled clock in homemade case built with choice of DG7/6 or the DG7-12C (3" diameter with very nice resolution, 8" long) with gold-plated electrodes. Gold pin sockets for the IC's and high quality components. Will also come with free upgrades to new firmware in the future !

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Funding period

- (30 days)