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This scope clock uses a purely analog signal to create the characters. Designed for large CRTs, it will drive more CRTs than the first.
12 backers pledged $3,313 to help bring this project to life.
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OSC5.4 board with a 3BP1 CRT
OSC5.4 board with a 3BP1 CRT

 

OSC5.4 w/ 3BP1
OSC5.4 w/ 3BP1

 

Side view of OSC5.4 w/ 3BP1
Side view of OSC5.4 w/ 3BP1

My project is a new design for the homemade analog oscilloscope clock, similar to my previous design but able to drive different and larger CRT types, like the 3BP1 shown above. 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.

OSC4.7 board with a 6Lo1i CRT
OSC4.7 board with a 6Lo1i CRT

 The new board starts with the same basic design as my previous models, but using a different type of supply for high voltage. The low voltage, wave shaper and blanking and deflection circuitry are similar but adjusted for higher voltage requirements, with some slight changes. The 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 OSC4.7 scope clock using the 2BP1/2AP1 CRT
The OSC4.7 scope clock using the 2BP1/2AP1 CRT

 The kit is similar to the original OSC4.7 kit, but adjusted to drive different CRT types. It 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.

The kit for the OSC4.7 version.
The kit for the OSC4.7 version.

The deluxe version will be built using the pledger's choice of either the OSC5.4 driving a 3BP1 (or similar) CRT with choices of blue tint or clear enclosure and either blue or green solder masked PC board, or the OSC4.7 version driving choice of CRT from the 2BP1, 6Lo1i, DG7-6 or similar CRTs with the same options for enclosure & PC board colors.

OSC4.7 with DG7-6 CRT
OSC4.7 with DG7-6 CRT

 

Here is the OSC4.7 board on a 2BP11 (rare blue phosphor) CRT.                                 This is only an example - I do not have any of these available as rewards.
Here is the OSC4.7 board on a 2BP11 (rare blue phosphor) CRT. This is only an example - I do not have any of these available as rewards.

 

Risks and challenges

Designing the circuitry to drive the analog portion of this clock was challenging ! I had a slight hitch re-designing the blanking circuit, which is critical, but worked it out. I wanted everything to be as simple as possible and to be driven by a single 5VDC supply. 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.

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  1. Select this reward

    Pledge $45 or more About $45

    OSC4.7 board

    The first reward is the OSC4.7 board from the first project. It includes the board and the preprogrammed microcontroller. Using the parts list and directions, a skilled and experienced electronic kit builder could build the driver board & assemble it to their own CRT and install it in their own enclosure. This board will drive only smaller, relatively low voltage CRTs, like the 2BP1 or 2AP1, DG7-6 or 6Lo1i.

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  2. Select this reward

    Pledge $145 or more About $145

    OSC4.7 kit

    Build it yourself ! The OSC4.7 kit is the kit from the first project. 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. This board will drive only smaller, relatively low voltage CRTs, like the 2BP1 or 2AP1, DG7-6 or 6Lo1i.

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  3. Select this reward

    Pledge $245 or more About $245

    OSC4.7 clock assembled

    A fully assembled OSC4.7 clock with the 2BP1/2AP1 (2" round) CRT & homemade plexiglass case including the 1/4" thick base and 1/8" thick shroud or dust cover. Uses the 2" diameter 2BP1 or 2AP1 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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  4. Select this reward

    Pledge $285 or more About $285

    OSC5.4 clock assembled

    A fully assembled OSC5.4 clock with the 3BP1 (3" round) CRT & homemade plexiglass case including the 1/4" thick base and 1/8" thick shroud or dust cover. Uses the 3" diameter 3BP1 crt. This is set for 120VAC (standard U.S.) only and will need an adapter for 240VAC (some other countries) and automatically sets for 60HZ or 50HZ.

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  5. Select this reward

    Pledge $345 or more About $345

    Deluxe OSC5.4 or OSC4.7 clock assembled

    A fully assembled OSC5.4 clock with the 3BP1 (3" round) CRT & homemade plexiglass case including the 1/4" thick base and 1/8" thick shroud or dust cover or a fully assembled OSC4.7 version with choice of CRT from 2AP1/2BP1, 6LO1i or DG7-6. Optional pc board in blue with yellow silkscreen or the standard green w/ white and also in optional blue or clear plexiglass. The OSC5.4 version is set for 120VAC (standard U.S.) only and will need an adapter for 240VAC (some other countries), while the OSC4.7 can be set for either 120VAC or 240VAC. Either will automatically set for 60HZ or 50HZ.

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Funding period

- (30 days)