Tag: CRT clock

  • Brimar Beauties for Plug & Play

    [Atif] is quite fond of his custom Oscilloclock Model 1, originally supplied with a bright green Brimar SE5F/P31 CRT. He just loves its crisp, clear trace! But wouldn’t it be great if he could plug-and-play a different CRT, to suit his mood of the day?

    [Atif]’s Oscilloclock Model 1 SE5F with P31 green phosphor… Could we change the mood?

    More specifically, could I create a second display unit (the acrylic tube on the left) using a CRT with a soft, long-persistence blue trace? And could he just swap the units around at will, without having to make any changes to the control unit?

    Absolutely! But to make the 2nd unit completely compatible for plug-and-play, we’d need the same SE5F type CRT, with a different phosphor. Looking at Brimar’s catalogue, this CRT was available in several phosphors – including a P7 blue. This is the same as used in the original Prototype, and it’s really good at showing off those exotic trailing effects!

    SE5F P7 specs

    So the hunt began…

    Now, this particular P7 CRT is famously difficult to come by – whether new OR used.

    The most common piece of old equipment employing the SE5F was the ubiquitous Telequipment S51 oscilloscope, but the overwhelming majority of those had a P31 phosphor CRT installed. Indeed, of all the demonstrably working S51’s posted on eBay in the past decade, I have never seen a single one showing an obviously blue trace!

    After many months of scouring auctions, suppliers and CRT fanatic colleagues across the globe, I managed to locate one SE5F/P7 in highly questionable condition – and located in Italy! With Google Translate as my friend, negotiations ensued, and – taking a substantial risk that the CRT would actually function – the unit was duly purchased and shipped.

    A dirty, slightly rusty SE5F/P7 CRT – snatched from the brinks of destruction in Italy

    Often, well-used CRTs exhibit scratches, spots, or burn-in marks on the internal phosphor coating. Fortunately, this CRT’s phosphor proved unblemished! And powering it up (for the first time in decades, most likely), it proved to be electrically faultless, as well!

    It works!

    Beautifying the Brimar

    You may think that cleaning a CRT is hardly worth writing home (or the world) about.

    Eucalyptus oil is amazing

    But this specimen was slathered in sticky, gooey tape residue, which had to be carefully removed. My chemical of choice for this is, believe it or not, eucalyptus oil! Not only does it remove the gunk, but it also serves to clear up any nasal or bronchial congestion that the technician may have at the time. Two birds with one stone!

    The more difficult issue was removal of the graphite coating. During manufacture, the front-most 8 cm of the glass of each SE5F was sprayed with a conductive graphite-based paint. Why? To make a high-voltage capacitor with the spiral accelerator anode (the beautiful green stripes) and similar graphite coating on the inside of the glass. By connecting the external coating to ground, the thrifty circuit designer could avoid using a separate (and expensive) high-voltage filter capacitor in the anode power supply!

    External and internal graphite coatings form an effective high-voltage capacitor!

    Why remove this coating? Because during use, it gets scratched and marred, as the above photo shows. Such a messy CRT could never be worthy to mount in a clear cast-acrylic case for an Oscilloclock! In addition, the coating obscures some of the attractive spiral accelerator anode, and blocks the incredible view of the trace from behind. And regarding circuit design, we at Oscilloclock NEVER scrimp – the Power Board has oodles of filtering capacity without relying on a graphite coating!

    While eucalyptus oil is also effective, it can get rather expensive in the quantity required – especially as the Oscilloclock lab is not conveniently located in Australia! The more reasonably priced chemical of choice here is nail polish remover. As always, there is a side-benefit – the nasal passages are assuaged by a delicate floral scent during cleaning, and fingers have an arguably nice smell that lingers for quite a while!

    Joking aside – gloves, open windows, good ventilation, and safety glasses (in case the CRT implodes) are key ingredients for this process!

    Eucalyptus oil and nail polish remover has done wonders to this Italian-sourced beauty!

    Onward!

    Having found the perfect CRT, [Atif]’s plug & play unit is now well under construction.


    Epilogue – “Good things come in threes”

    It’s not good just getting one CRT. What if [Atif] wanted a spare? What if I wanted a spare for my venerable Prototype clock? Following from the Italian success, I continued a further 6-month hunt, and managed two achievements.

    The first was a Telequipment S51b unit located in the U.K. that was non-functional, but that I suspected may have a P7 phosphor installed. How could I possibly suspect this? Well, perhaps this is an art rather than a science, but there were several tell-tale signs:

    • The way the phosphor looked under the camera flash or ambient light
    • The colour (or absence) of the graticule (the plastic cover in front of the CRT)
    • The fact that I got a double when I rolled the dice to decide whether to take the plunge or not!
    Oops, it was a P31 – the dice did not roll in my favour that time!

    The seller of this unit was not willing (or perhaps not technically able) to extract the CRT, check the CRT type, or ship overseas. Fortunately, my colleague in the U.K. was more than happy to receive the scope at his end. Thus arranged, when the unit arrived he extracted the CRT and confirmed that – sadly – I had purchased a P31 CRT.

    But I shipped it across anyway, and the CRT tested well. Rescuing a functional SE5F/P31 from eventual demise was still a worthy accomplishment!

    The second achievement was prompted by an auction listing for a “Brimar SE5F”, but with little indication as to the phosphor. The photos of the label (see right), even with subsequent close-ups provided by the seller upon request, were not conclusive.

    The image shows two characters beginning with ‘P’. It looks like “P1”, which is another extremely common green phosphor used in many CRTs since the beginning of time. However, we saw in the catalogue earlier that Brimar only supplied GV, P7, P31, and P39 phosphors as standard. It is unlikely that any equipment manufacturer would have requested Brimar to produce a custom CRT batch using the less-exotic P1 phosphor… Leaving the P7 as the only likely candidate!

    Convinced, the CRT was duly shipped across and tested – and lo and behold, success! A spare P7 was safely procured.

    And with that, the long saga of this CRT hunt closes. As they say, “good things come in threes!”


    Like what you see?

    Cathode ray tubes used to be manufactured in all shapes, sizes, and colours. Some prove harder than others to find! But if you prefer an exotic creation, don’t give up – there is something for you out there, and here at Oscilloclock we will find it.

    As always, see previous posts and the Gallery for info on unique creations!

  • Recently I had an enquiry from [Frank], who had just begun a life-long love affair with scope clocks by purchasing one on eBay. The clock was great – but he felt that the two available screens (simple analogue and digital clock faces) lacked a certain oomph.

    He then stumbled across Oscilloclock.com, and in his smitten state immediately reached out with his number one question: just what screens are available on an Oscilloclock?

    Well, let me save Frank’s time trawling through years of blog posts. Right here in one place are most of the Oscilloclock screens and features created to date.

    Enjoy the show!

    Standard Time Screens

    These stock-standard analogue and digital time screens may be quite simple, but they do evoke the ‘retro’ look that most people appreciate.

    And you can flip a menu setting to display days, months, years in Japanese:

    There are also some ‘random’ screens that add in a bit of dynamic visual entertainment:

    • Random number screen
    • Random letter sequence screen
    • Random four letter word screen (clean words only, by default!)
    • Random phrase screen (the phrase list is typically customized to a theme)

    And of course the mesmerizing Timedrops screen:

    Themed Screens and Features

    … These themed features were developed more recently, and can be added for a small fee to help cover development costs!

    Astroclock (Sidereal Time)

    External XY input

    OscilloTerm (serial terminal)

    Oscilloblock (lego)

    Metropolis

    Aftershock Clock (Earthquake display)

    Unbirthday Clock

    War Games

    Logo screens

    Over the years many folks have requested that I render custom logos in Circle Graphics. Here are some examples:

    “Seasonal Treats”

    Up next are some fun, mildly interactive animation features. Not exactly screens per se, these animations pop up after a predefined period of inactivity – but only during certain months of the year. Can you guess which months?

    Boo!
    Santa in your Clock!

    Menu screens

    There are far too many configuration menu and test screens to present here. Fiddle to your heart’s content!



    Q. How are screens switched?

    Screens are switched simply by rotating the control knob in one direction or other.

    There is also a configurable auto-switch feature; the screen is changed every 90 seconds in a predefined order (with the exception of some animation screens). The display time is configurable, and the auto-switch feature can also be turned off for those who prefer to switch screens manually.

    Q. How are screens selected & configured?

    Customers can request screens to include and/or specify the switching order. The configuration is done here in the lab before clocks are delivered.

    Oscilloclock also provides a firmware upgrade kit, which allows the customer to upload a revised version of the firmware into the clock themselves. Using this, updates to screens and other features can be uploaded without shipping the clock back to the lab.

    Q. What is the process for rendering a custom screen or logo?

    We typically prepare a mock-up based on the customer’s description, sketch, or image file. This is tweaked as needed until the screen looks just right to the customer.



    Like what you see? Contact me!
  • Metropolis Mania!

    Oscilloclocks are special. Oscilloclocks are unique. We know this. But in November 2015, a request for something exceptionally special and unique arrived from [Andrew] – he wanted me to craft a Metropolis movie themed timepiece!

    Metropolis Movie Poster

    Metropolis is a classic science-fiction silent movie created by Fritz Lang in 1927. It’s an amazingly beautiful film with a fascinating plot, passionate acting, and attractive futuristic props and architecture heavily influenced by the Art Deco and other artistic movements. (Haven’t seen this movie? I recommend “The Complete Metropolis”, Blu-Ray version!)

    Well, Andrew was building a very large space at his home dedicated to the Metropolis movie. It would be a full-on “man cave”, with a lounge/bar, music and video venue, mad scientist lab, and collection display space. The mad scientist part of the building would house various scientific demonstrations based on vintage physics or chemistry experiments, with a dose of mad science thrown in.

    Andrew was collecting themed art and memorabilia for his man-cave, and had even commissioned a full size ‘Maria’ robot (#3 in the world) from the licensed manufacturer…

    But there was one thing missing – a Metropolis 10-hour clock.

    Metropolis Time

    In the Metropolis movie, the Rulers enjoy their lives in normal time, but the Workers are forced to perform their heavy-labour duties in 2 shifts of 10 ‘worker hours’ each day. The Workers’ clocks are thus labelled with only 10 hours.

    Metropolis clocks for Rulers and Workers
    Metropolis clocks – Normal time for Rulers (top), but 10-hour time for Workers (bottom)

    The 10-hour clock features in multiple scenes throughout the movie, as clear symbology that the controlling and oppressive Masters can even manipulate Time – if only on the surface!

    In this scene, Freder struggles with the clock machine...
    In this scene, Freder struggles with the clock machine…

    [Andrew] wanted to commission an Oscilloclock that would display an authentic 10-hour Worker clock face with accurate hour, second and minute hand movement, as well as the normal 12 (24) hour Ruler clock faces. He also wanted all numerals and characters rendered in the Metropolis font. This could be THE talking piece of the man-cave!

    Presenting… the Metropolis Oscilloclock!

    After 8 months of discussion and development, the first Metropolis Clock was finally delivered. This unit is based on the same beautiful Toshiba ST-1248D vintage oscilloscope model used in a previous conversion. However, it incorporates some wonderful new features, including LED-backlit valves and an external input feature to support Lissajous figures generated by an iPhone or other device!

    The Metropolis Clock - Toshiba ST-1248D - 01
    Metropolis Clock - 06
    Artwork on the splash screen evokes an image of the skyscrapers in the movie poster…
    The clock keeps both 'normal' and Metropolis 10-hour time!
    The clock keeps both ‘normal’ and Metropolis 10-hour time!
    The Metropolis 10-hour clock face!
    X-Y Input feature allows display of Lissajous figures from an iPhone!
    Realistic LED backlighting - enjoy the valves without actually heating them up!
    Realistic LED backlighting – enjoy the valves without actually heating them up!

    To be continued…

    Each of the new features built out for this exotic creation deserves a post on its own. Stay tuned for many more pictures and information about Lissajous inputs, backlit valves, and Metropolis time switching!

    Also, careful readers would notice my use of the phrase “first Metropolis Oscilloclock”. Andrew was so delighted with the Toshiba ST-1248D unit that he commissioned a second Metropolis clock with even more firmware enhancements, based on the Tektronix 520A. Another topic for another day!


    See the Metropolis Archive for all other posts in this series!


    Like what you see?

    Metropolis is just fantastic as a theme for a custom Oscilloclock. But if you have a different passion that needs horological augmentation, let me know!

  • Kikusui Time

    Time – the universal constant. Time passes the same for all peoples; rich or poor, busy or idle, inspired or dispirited. And time has certainly passed for Oscilloclock.com since the 2015 Tokyo Maker Faire – the event that just keeps giving!

    At last, we present the final model from that Faire – the Kikusui 537 Oscilloclock!

    See this in HD, and find more exciting videos on my YouTube channel

    The Kikusui 537 was hand-picked for conversion by the lab’s youngest technician (9 at the time). He chose it for its small size and portability, but also for its cute colour scheme! A dainty red sweep adjustment knob highlights a bright white and black control panel, with a blue case providing overall contrast and visual soothing.

    Kikusui 537 Oscilloclock

    The 537 Oscilloclock’s small size makes it the perfect clock for an office desk, bedside table, or mantle. And since this is a ‘maximum re-use’ conversion, the existing circuit is active and all the front panel controls are fully functional. Fiddle with the image’s size and position to your heart’s content! Switch from XY mode to normal sweep mode, to view raw Oscilloclock signals in real time, as the seconds tick by!

    History

    Kikusui Logo
    The Kikusui Electronics Corp. logo

    The 537 was manufactured by Kikusui Electronics Corp., a major producer of test equipment in Japan since 1951. It was produced in large numbers from 1975 and was extremely popular for its small form factor, solid-state design, 5 MHz bandwidth, and ‘low’ price of 45,000 yen (perhaps USD 1,000 in today’s terms). See the catalogue page (Japanese only) and the operating manual (Japanese and English).

    Construction highlights

    In a previous post, I mentioned there are several general approaches to converting an oscilloscope. Since the Kikusui 537 is fully solid-state (it uses transistors instead of valves/tubes, except for the CRT) and it is only 40 years old, I decided on the maximum re-use, minimal invasion approach. (I really should trademark that term!)

    This approach involves tying the Oscilloclock Control Board‘s outputs directly into the existing X and Y amplifier circuits. This was easy to do in the 537!

    Kikusui 537 Oscilloclock - inside top
    Oscilloclock Control Board mounted in the 537

    However, as discussed in the Circle Graphics post, we also need to be able to blank the beam at extremely precise intervals. Sadly, the 537 (like nearly all oscilloscopes of this vintage) does NOT have a convenient DC pulse-tolerant Z-axis input. I therefore installed an Oscilloclock Power Board, partially populated to serve as an isolated blanking amplifier, in series with the grid.

    Partially populated Oscilloclock Power Board
    Partially populated Oscilloclock Power Board

    Finally, an Oscilloclock Supply Board was needed to power the other boards.

    An Oscilloclock Supply Board is also nestled in there!
    An Oscilloclock Supply Board is also nestled in there!

    Mounting the Control

    What better place to fit the rotary encoder, than on the beautiful red sweep frequency adjustment knob that my junior technician liked so much! Here’s the general story:

    Kikusui 537 Oscilloclock - control (original)
    Sweep adjust control in its original state
    After removing the potentiometer
    After removing the potentiometer
    The encoder, after hacking with a hacksaw!
    The encoder, after hacking with a hacksaw!
    Kikusui 537 Oscilloclock - control mounted
    Voila – sweep knob now drives the rotary encoder!

    Like what you see?

    One of the two Kikusui 537 Oscilloclocks crafted for the Maker Faire is still available for the special person with a soft spot for a krazy kikusui klock. Visit the Availability page for more information, and of course see the Gallery for other unique creations!

  • Spring… a beautiful time of year! I particularly enjoy the warm rains, with the soothing effects of raindrops pit-pattering into puddles outside my window.

    But no longer do I need to look outside! Inspired by a recent post on Hackaday, a suggestion from [A-Nonamus] in the neonixie-l group, and by Spring itself, I can now enjoy Timedrops on my Oscilloclocks:

    See this in HD, and find more exciting videos on my YouTube channel
    Music credits: Space Bazooka by Kirkoid (c) 2013 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/Kirkoid/43005

    Assembly?!

    A sprite engine
    A sprite engine

    The current Oscilloclock firmware is written entirely in PIC 18F Assembly. The Timedrops feature leverages a Sprite Engine module, first developed for Halloween Seasonal Treats and later utilized in the Santa’s sleigh feature.

    To display Timedrops, the sprite engine is initialized with 10 sprites – 4 digits for hours and minutes, a colon, and 5 ellipses as ‘ripples’. The 5 characters are set at the top of the screen with a randomized negative velocity. When a character reaches the bottom boundary, the sprite engine’s default explode sequence is started, and the associated ripple sprite is made visible and set to expand. When the explosion sequence for a character sprite is complete, the sprite is reset at the top of the screen.

    Looking for the source code? Sorry – refactoring is still under way, and the latest revision with the Timedrops feature will be uploaded in the near future.