Screens & Things

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!

Connect !!

These days, just about everyone has an old oscilloscope lying around. You know, an old, dusty, derelict scope handed down from Grandpa (or Grandma). Well, [Paul] had something even better – an old Tektronix 602 X-Y Monitor! Could an Oscilloclock Control Board drive this vintage beauty? Absolutely. Could I make an aesthetically pleasing case? Definitely. How about time sync via WiFi? Stock standard!

Presenting the Oscilloclock Connect:

Here’s what it looks like plugged in to my fabulous old Tektronix 620 monitor:

And why not have a pair of Connects drive a Tek 601 and 602?

The Build

The main component of the Connect is, of course, a standard Oscilloclock Control Board. As usual, all 121 parts on Paul’s board were individually mounted and soldered by hand. The board then was programmed and underwent rigorous inspection and testing. Finally, the board was cleaned to remove flux and renegade flecks of solder, and sprayed with HV coating for humidity protection and – arguably more importantly – to give it its glorious sheen.

The case was custom-made and professionally machined right here in Japan from 6mm-thick sheets of pure cast acrylic (not extruded). This is an extremely transparent, hard, high grade acrylic – and Oscilloclocks deserve nothing less!

The case was sprayed with a special acrylic cleaner and static protection solution, before fitting the various components. Naturally, every part was cherry-picked, right down to the three BNC connectors – they needed an aesthetically pleasing colour, but they also had to have a shaft long enough to mount through 6mm-thick acrylic!

Finally, the physical interface! The knob was chosen for its perfect finger-fit and delicate aluminium/black tones, which gently contrast with the rest of the unit.

The Compatibility Crisis

Over the years, many folks have observed that the scope at hand has an “X-Y mode”, and asked if they could just ‘plug in’ an Oscilloclock Control Board. “Is it compatible?” Unfortunately, the response has usually been disappointing.

You see, creating figures and characters with Circle Graphics relies on the scope’s ability to turn the beam on and off at split-second intervals. This feature is called a “Z-axis input”. While many scopes from the 80’s and beyond do sport such an input, there are two common limitations:

Limitation 1: AC-coupled Z-axis inputs

Capacitive coupling – effective at isolating the input from cathode potential (-1260V !)

The input is connected to the CRT’s grid or cathode circuit via a capacitor. This is a low-cost, effective way to isolate the (usually) very high negative voltage of the grid circuit from the input.

The problem here is that the capacitor, by its very nature, removes the edges from the pulse. The controller is no longer able to control the beam on/off timing, and you end up with uneven blanking across the segments, as shown in the screenshot at right.

Depending on the values of the capacitor and the surrounding resistors, the symptoms may not be severe. However, the best way to resolve this problem (while still keeping the oscilloscope’s original circuit intact) is to insert an isolated DC blanking amplifier directly in series with the grid (or cathode). See the Kikusui 537 Oscilloclock for an example of this.

LIMITATION 2: INSUFFICIENT BLANKING AMPLIFICATION

Most oscilloscopes tend to require at least +5V on the Z-axis input to noticeably blank the beam. The Connect, however, is only capable of delivering +2.5V. It works just fine if you set the scope’s Intensity control very low, but as you increase intensity, the blanking quickly becomes ineffective.

Below we have a beautiful Japanese YEW (Yokogawa Electric Works) 3667 storage scope. The left shot is misleading due to the camera exposure; the displayed image is actually extremely dim. The right shot shows the same* image with the intensity control increased – the image is bright, but there is no blanking!

* Astute readers will observe that the time is significantly different between the two shots. This is a result of the WiFi NTP sync kicking in right in the middle! More (or less) astute readers may also notice that the scope’s trace rotation is not adjusted very well…

Of course, it would be a simple matter to incorporate a pre-amplifier for the Z-axis, which would solve this problem. This will be introduced with the next Control Board revision!


Like what you see?

Nothing brings more joy than connecting this bundle of usefulness into a woefully unused old oscilloscope or X-Y monitor. If this is of interest to you, visit the Availability page for more information, and of course see the Gallery for other unique creations!

War Games on an Oscilloclock!

As I’ve hinted before, your friendly Oscilloclock gang is entirely pacifistic. We abhor the thought of actual military activity in this modern day and age. BUT we love games just as much as anyone – and we also love light-hearted movies with happy endings!

So when [Ian] (of Bunker Club Clock fame) came up with the idea of a feature based on the iconic 1984 flick “War Games“, I pounced on the chance!

Check out my YouTube channel to see this and other videos in HD!

Now, this may look like a simple animation. But Ian’s Oscilloclock is powered by a tiny processor with minimal specifications, and 100% of the code is written in assembly language. Implementing this baby in assembly and keeping within just 3K of RAM was quite an accomplishment!!

About the host clock

The gorgeous model shown here is a painstakingly-retrofitted Heathkit CO-1015 Engine Analyzer. It’s the perfect play-toy for any serious motor-head who grew up during the Cold War!

First up on the custom build list is the original meter fitted with amber LED lighting and ticking audibly each second. (And yes, the tick intensity can be easily adjusted.)

Next up, there is the optional External X-Y input feature. Normally, this is used for plain and simple Lissajous figures like the below…

… but by tweaking some settings, we can get some segments of Jerobeam Fenderson’s incredible Oscilloscope Music Kickstarter video to display quite nicely!

Peeking inside the Engine Analyzer Oscilloclock is also a must-do! Not only is this visually appealing, but you also get a significant olfactory kick from the sweet smell of vintage electronic components…

Attractive Oscilloclock boards and cabling, neatly tucked away

The original circuit is completely bypassed – but still looks awesome!

Tech Talk – Strategies, Maps, and Missiles

The War Games feature uses the Oscilloclock’s Sprite Engine module to display the world map and up to 9 missiles when the W.O.P.R. system is simulating various war strategies.

32 of the 130+ strategies seen in the movie are implemented. For each strategy, a random number of missiles are launched along a predefined Primary trajectory, followed by a random number of missiles along a predefined Retaliatory trajectory. If any of the 9 missiles remain, they are launched along randomly selected (but predefined) trajectories.

Trajectories are predefined because computing them using 8-bit arithmetic would consume a huge number of cycles! At least, a small amount of randomness is added to the launch position and velocity parameters at run-time, to make things more interesting.

As the simulation progresses through the strategies, the speed of the launches increases and the delay between launches decreases. This gives a similar effect to that in the move, where WOPR moves through strategies at warp speed until it realises that there is no winning this game…

A Joint Effort

Creating a huge number of realistic trajectories (68 in total), translating start and end X and Y coordinates from latitude and longitude into the Oscilloclock’s Cartesian plane was a task of mind-blowing proportions! Here we see our 2nd junior technician eagerly earning his room and board.


Like what you see?

Are you a petrol-head? You need an Engine Analyzer ticking over at your bedside or in your office! Were you brought up during the Cold War, perhaps in the Soviet Union or in the US? Get the War Games feature and fry the world safely! Contact me if you like what you see.

(Disclaimer: Oscilloclock.com hopes that no-one is offended by the deliberately light-hearted tone of this post, in referring to the decidedly serious topic of nuclear warfare.)

Amber Ambience

Amber.
Gentle. Soft. Warm.

New tech meets old tech – again.

When I first heard from [Masahalu], a local artist and woodwork craftsman, I had a hunch that Oscilloclock history was about to be made.

His request initially seemed simple; he wanted an Oscilloclock Core – a bare-bones board and CRT assembly, which he could install into a case of his own design.

However, he wanted something totally unique. Something old, yes, but also something new. The artist in him demanded a different canvas of creativity.

Presenting Masahalu’s new canvas: A 5″ amber CRT Oscilloclock!

Masahalu insisted on an “autographed” splash screen!
More Oscilloclock Core: boards, cabling, WiFi module, power pack

Phantastic Phosphors

The new-old-stock CRT shipped with this unit features a P12 phosphor, and was originally produced for use in radar equipment. The phosphor’s long after-trace (persistence) allows for some fascinating ‘trailing effects’ in the Oscilloclock’s various animations.

Those familiar with CRT phosphors may point out that P12 is often classified as an orange phosphor, not “amber”. To my eye, though, the soft, warm trace of this CRT is better associated with eons-old fossilized tree resin than the sharp, bright color of fruit.

Amber? Or Orange? Depends on your point of view – and perhaps the camera!

Amber CRTs are quite rare, especially in larger sizes. 3-inch P12 CRTs can be found, but the Oscilloclock Lab was fortunate to find several of these rare 5-inch CRTs.

[Masahalu] has certainly ended up with the unique canvas he requested, and we look forward to seeing what kind of case design he ends up with!


Like what you see?

It’s so much fun letting these cathode ray tubes shine their colourful rays again! Whether you’re into yellow, amber, blue, white, or just plain green, there is something here for you. Visit the Availability page for more information, and of course see the Gallery for other unique creations!

Quake News!

Fake news – a common keyword these days. Fortunately, Oscilloclocks do not display fake news. But wouldn’t it be handy to see quake news on an exotic scope clock? This is the challenge [Atif] gave me – and one year and many grey hairs later, here is the result: The AfterShock Clock!

This custom-crafted Oscilloclock Core Duo assembly is a unique first in several ways:

  1. It’s the first scope clock ever that pulls in and displays real earthquake data!
  2. It’s the first scope clock ever that puts a dual-beam CRT to good use – one beam for the clock display, and the other for the earthquake and map overlay!

Earthquake display

The AfterShock Clock’s WiFi module connects at regular intervals to two public APIs (servers) to collect the latest earthquake events. It then feeds earthquakes to the clock’s quake gun controller, rotating quakes every 30 seconds. Cool!

(Note: flickering is due to camera effects and is not visible to the human eye)

Of course, there is the usual wide variety of standard clock screens to cycle through! The quake map’s beam is automatically dimmed for most of the screens, giving a soft ‘watermark’ effect.

Dual-beam CRT

The E10-12GH CRT used in this clock is certainly not mundane!

Beautiful spiral PDA lets you really see inside the cavity!

Nothing beats a dual-gun CRT for intricacy… (except a quad- or pentuple-gun CRT!)

Oscilloclock Core Duo

Atif wanted to create his own case, so he initially asked for an Oscilloclock Core. But currently a single Core set does not provide control, deflection, and blanking circuits to drive TWO electron guns… So he had two choices:

  1. Wait an eternity for me to redesign the boards to fully support dual beams.
  2. Get started now! Simply put two Core assemblies together, with some degree of inter-control and removing any redundant circuits.

Atif chose the latter – and the Oscilloclock Core Duo was born!

WiFi setup

Setting up the WiFi connection is easy – just connect a device to the clock’s administration SSID and pull up the admin page. (To foil any would-be hackers out there, the admin SSID is available only for the first 5 minutes after power is applied.)

Then, access the admin URL and configure the connection to your home router:

There are a million other advanced settings to tweak things such as quake polling interval, quake magnitude filters, maximum quake age before purge, and other geeky aspects….

Oh, I forgot to mention – the clock also synchronizes time against an NTP server, eliminating the need for a GPS module.


Like what you see?

Do you go for electron guns? idolize intricate electrode assemblies? Have a filament fetish? Or just want some quake news? This kind of clock might fit the bill. Let me know!

Bunker Club Clock

It’s the 1970’s. The cold war. The U.S. and Russia aim nuclear weapons at each other. How do you prepare for the worst? Why, you build a bunker, of course!

Today, [Ian] has done just that. Not a real nuclear fallout shelter, of course, but a period-themed bar called the Bunker Club. What better way to face disaster, than over drinks with the mates!

Ian decided to pepper his bar with vintage equipment that looked the part. But he wanted to make them truly functional, to entertain his retro-loving customers. So, he commissioned the Bunker Club VectorClock!

Now, regular followers of the blog will easily recognize the base unit here as a Tektronix 520A Vectorscope. So far a total of four of these delightfully-lighted machines have been converted to retro Oscilloclocks – see the Gallery for other examples.

But as always with any model, Ian wanted to make some cool customizations. Let’s look at two of them.

1. External XY Input

First introduced in the Metropolis Clock, this feature allows Ian to input two signals and visualize them in X-Y format on the screen. This is very, very useful for generating custom Lissajous figures externally – using either a cheap signal generator, or even an iPhone!

Lissajous figures from an iPhone!

Cool Lissajous figures – even from a humble iPhone! (note, this picture is of the Metropolis Clock)

The external signals are rendered within a rectangular ‘window’, pre-configured to look nice alongside other standard parts of the Oscilloclock screens. For some screens, the window is drawn large but with a lower intensity, forming a kind of ‘watermark’. This is an awesome effect!

2. Custom Logos

Nearly all Oscilloclocks feature some kind of customized logo. Past examples include the customers’ business’ name, the name of the oscilloscope manufacturer, or even the name of the customer’s favourite film:

Toshiba ST-1248D - Brass bezel

Kikusui 537

Metropolis Clock

In Ian’s case, the obvious candidate was his new bar’s official logo – a very chunky-looking rocket blasting through the atmosphere!

Further enhancements … on the way

It seems Ian enjoyed his first clock so much, that he has commissioned a second, with a completely different physical look. Some further special effects and display animation are planned, to further enhance the nuclear theme and keep his customers happy. Stay tuned!


Like what you see?

Do you own a bar? Well, normally you wouldn’t want a clock in your premises, as it would help customers keep track of their time, which would be bad for business. But Oscilloclocks are so much more than timekeepers! Recent feature additions make them lots of fun to watch and fiddle with. If you have special ideas, let me know!

(Disclaimer: Oscilloclock.com hopes that no-one is offended by the deliberately light-hearted tone of this post, in referring to the decidedly serious topic of nuclear warfare.)

The VGA Cube!

It’s been a long while since I wrote about the 3″ VGA Display assembly, which was used for an RWR indicator in a fighter cockpit simulator.

The customer came back and requested four more. But could I stack the boards to make the units more compact? Of course!!

This particular assembly is rather tall because the client requested an in-built mains supply board, sitting at the bottom. The normal configuration using an external power pack is half the height. (In which case it’s not quite a “cube”…)

With green filter and replica RWR escutcheon fabricated by the customer. How real is that!!

And if you aren’t into aircraft indicators, you could always have a bit of fun!

Is a VGA Cube right for you?

Maybe. Or maybe not! These units incorporate binary blanking – I.e. The beam is either on or off; no shades of grey. Hence any VGA image composed of thick line art like RWR will display well, but shaded or coloured displays such as an attitude / horizon indicator would not work so well.

Below is a Windows XP login screen… Not exactly a flattering image!!

VGA Board – better and better

The latest VGA Board rev 1.1x is small and cute, and is compatible with the standard Oscilloclock Deflection and Power Boards.

In keeping with tradition, the VGA Board employs entirely analogue techniques to generate the horizontal and vertical sweep, triggered by incoming sync pulses. A high-speed analogue comparator with adjustable levelling is used to convert analogue RGB into binary blanking. Naturally, inputs are ESD protected so you can’t easily blow the chips!

New VGA Board revision (left) – meaner and leaner!


Like what you see?

VGA Cubes are like any other Oscilloclock product – each unit is hand-crafted to order and fully tested so that I can optimise for the selected CRT and provide a decent satisfaction guarantee. To date I’ve made five – and always happy to discuss a sixth! If you have a passion for raster rendering, let me know!

Metropolis Time

In an earlier rambling, I introduced the Metropolis Oscilloclock, themed after the classic 1927 science fiction movie. The clock seems to have garnered some attention, and thanks to the kind folks over at Hackaday, I now have two additional facts to relate:

  1. The “Maria” robot in Metropolis inspired the design for C-3PO in Star Wars!
  2. Some folks have considered the Workers’ clock to be Decimal !

The first point stands without dispute, but let’s take a closer look at this “Decimal” aspect, as I’d never considered it before.

Decimal Time vs. Metropolis Time

Below is what got folks interested – the 10 hour clock face. The Masters used this to dupe the Workers into believing they were working short shifts, when in fact they were slaving away for a full 12 hours. Ingenious!

But this is not Decimal Time, where time is divided into units that are purely decimally related. Yes, there are 10 hours on the face, but there are 20 hours per day, and 60 minutes to the hour. And, if you bother to count the dots around the edge, you can see there are 72 seconds per minute. None of these are decimally related.

Speaking of decimal time, I fondly remember a Metric Clock article in the April 1987 edition of Electronics Australia. Being but a wee lad at the time, I was gullible enough to believe that true Decimal Time was going to be introduced in Australia imminently. I ‘convinced’ my father (he led me on) that it was really happening, and I was just about to purchase the kit to build my own Metric Clock… when in the following month’s edition, the magazine came clean that it was actually an April Fool’s joke!

But enough fooling around – let’s now take a closer look at the Oscilloclock implementation of Metropolis Time…

Metropolis Time vs. Regular Time

The two clocks in Metropolis differ only in one way: the length of an ‘hour’. This is easy to grasp, since there are 20 hours per day in one, versus 24 hours per day in the other.

But from here, Metropolis messes with your mind! Below are some revelations that [Andrew] and I battled over numerous e-mails to come to terms with:

  • The hour hands on the 10h face and the 12h face must always be exactly aligned (they must go around at the same speed).
  • Since an M-time hour is 20% longer, the minute hand must go around slower.
  • To make the M-time minute hand go around slower, the second hand must also go around slower.

Even if this makes sense so far, the crunch comes when you think about how to implement it. If it were a physical clock, the tick speed could be slowed and the gears could be modified to make the seconds and minutes go slower but the hour hand itself move at the same speed. Easy!

But it’s not a physical clock, and in the current Control Board design, the tick speed is NOT readily adjustable as it is derived from the MCU clock, which all the critical display routines are optimised around. So essentially, the length of a second cannot be changed.

Without changing the length of a second, how can we make the minute hand go around 20% slower? Well, there are only two options:

  1. Have 72 seconds per minute, with 60 minutes per hour
  2. Have 60 seconds per minute, with 72 minutes per hour

We decided on the first option, and you can see from the video below that the second hand indeed moves through 360 degrees in 72 steps (actually half that, since there is a half-tick).

An interesting tweak here is the shape of the hands. Note that they have triangular outlines, to more accurately mimic the hands in the film. But computing the angles and projecting these outlined hands using Circle Graphics was a true challenge – especially as the current Oscilloclock firmware is written 100% in PIC18F assembly code! Assembly is great for optimizing timing, but with no maths related processor instructions or functions to leverage, this feature was a huge effort…

Why assembly code? Just because I can!

Digital Metropolis Time

Everything was now all fine and dandy for the analogue 10h clock face, but what about all those nice digital faces that are stock standard in every Oscilloclock? Could I make Metropolis Time make sense in a digital format as well?

Of course! Except there was one hitch. Since we have 72 seconds per minute, the clock would show times like 09:16:65. This would look odd. Andrew wanted to keep the seconds in the range 0-59, like in a normal clock. Something would have to give… but what?

The answer was to simply ‘ignore’ one second in every six; i.e. the 5th second shows for 2 seconds before incrementing. This is easiest illustrated with another video (note what happens at the 10:57:55 mark):

But easiest of all is to see this in Excel. The duplicate second is highlighted:

Switching between Metropolis and Regular Time

Now, let’s face it: Metropolis time is really not very useful in day-to-day life; not for us Masters. Andrew wanted to be able to revert all faces at will to show Regular time instead of Metropolis time (except the 10h analogue clock face).

This was duly implemented during production of the 2nd Metropolis Oscilloclock – which will be presented in an upcoming post.


If, like me, you are hopeless at simple time zone conversions but you’ve actually managed to fully get your head around the above, Congratulations! Stay tuned for more posts in the Metropolis series.

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 PosterMetropolis 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!

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!