I received a note from Mitchell Janoff "I wanted to thank you for posting the information on the HP Z3801A on your web site. I recently purchased one of these units from a gentleman in Korea who was also selling on Ebay. I might have been more cautious if I had read your web site before my purchase. It turns out I was pretty lucky. My unit is factory wired for 110v AC (uses a standard PC type power cord) operation and also has a standard 9 pin RS232 input. Since it also came with the antenna, setting it up was a snap.

I did need to get a null modem for the connection to the computer, but otherwise I didn't have any problems. Tom Van Baak gave me the UTC diag. Instruction and the reboot tip. Thanks again for providing a valuable resource.

Additional information from Chuck Zabilski, WB6MOB, on modifying the receiver to use RS232:
"I just modified a Z3801A GPS receiver and I discovered a way to get it to interface at the RS-232 level and not have to resort to RS-422. The main board has a set of uninstalled headers marked RS-232 and RS-422 respectively near the DB-25 connector. These are arranged as 3 rows of 8 connections on 0.100 inch spacing. By installing 3 rows of 8 male headers I am able to select between the RS-422 and RS-232. In terms of the jumpers and headers, I could only verify that the 1st 5 actually connected anywhere, but I went ahead and installed all 8 headers time 3 rows. The only other thing required is to flip the board over and remove the five 0 Ohm jumpers which preselected the RS-422 interface. Once these surface mount jumpers (resistors) are removed, the newly installed headers select RS-422 or RS-232."

Dj Models Arah 62 [better] -

The Ultimate Review of DJ Models Arah 62: A Game-Changing Figure in the World of DJ Culture

The world of DJ culture has witnessed a plethora of iconic figures over the years, but few have made as significant an impact as Arah, the stunning model from DJ Models. Born out of a passion for music, fashion, and art, Arah has been turning heads with her captivating presence and infectious energy. In this article, we'll take a closer look at the life and career of Arah, specifically focusing on her work with DJ Models and her rise to fame with the Arah 62 project.

Who is Arah?

Arah is a professional model and DJ, who has been making waves in the entertainment industry with her unique blend of style, charisma, and musical talent. With a background in dance and a deep passion for electronic music, Arah has always been drawn to the world of DJing. Her dedication and hard work have earned her a reputation as one of the most exciting and versatile models in the industry.

The Arah 62 Project

The Arah 62 project is a collaboration between Arah and DJ Models, a renowned modeling agency that specializes in representing talent for the music and entertainment industry. The project aims to showcase Arah's skills as a DJ and model, while pushing the boundaries of creative expression and innovation. With the Arah 62 project, Arah has been able to combine her love of music, fashion, and art, creating a truly unique and captivating experience for fans and followers.

What Makes Arah 62 So Special?

So, what sets Arah 62 apart from other modeling projects? For starters, Arah's passion for DJing and music is evident in every aspect of the project. From her electrifying live performances to her stunning photo shoots, Arah brings a level of energy and enthusiasm that is hard to match. Her dedication to her craft is inspiring, and her commitment to pushing the boundaries of what is possible is truly impressive.

Another key factor that makes Arah 62 so special is the level of creativity and innovation that has gone into the project. From the striking visuals to the infectious beats, every element of Arah 62 has been carefully crafted to create a truly immersive experience. Whether you're a fan of electronic music, fashion, or art, Arah 62 has something to offer.

The Impact of Arah 62 on DJ Culture

The impact of Arah 62 on DJ culture cannot be overstated. As a model and DJ, Arah has been able to bring a fresh perspective to the world of electronic music, inspiring a new generation of DJs and producers. Her influence can be seen in the way she seamlessly blends music, fashion, and art, creating a truly unique and captivating experience.

Arah's success with the Arah 62 project has also helped to break down barriers and challenge traditional notions of what it means to be a model or a DJ. With her confident stage presence and infectious energy, Arah has proven that women can be just as successful and influential in the world of DJing as men.

The Future of Arah 62

As the Arah 62 project continues to gain momentum, fans and followers are eagerly anticipating what's next. With a string of upcoming performances and appearances, Arah is set to take the world of DJ culture by storm. Whether she's spinning tracks at a major festival or modeling for a high-profile campaign, Arah is sure to turn heads and inspire a new generation of fans.

Conclusion

In conclusion, the Arah 62 project is a game-changing figure in the world of DJ culture. With her unique blend of style, charisma, and musical talent, Arah has been able to make a lasting impact on the entertainment industry. As a model and DJ, Arah has proven that with hard work, dedication, and a passion for creativity, anything is possible.

Whether you're a fan of electronic music, fashion, or art, Arah 62 is a must-see experience. With her captivating presence and infectious energy, Arah is sure to inspire and entertain audiences around the world. So, if you haven't already, be sure to check out the Arah 62 project and experience the magic for yourself.

Key Takeaways

Arah is a professional model and DJ who has been making waves in the entertainment industry with her unique blend of style, charisma, and musical talent.
The Arah 62 project is a collaboration between Arah and DJ Models, aimed at showcasing Arah's skills as a DJ and model while pushing the boundaries of creative expression and innovation.
Arah 62 is a game-changing figure in the world of DJ culture, inspiring a new generation of DJs and producers with her passion, energy, and creativity.
The Arah 62 project has helped to break down barriers and challenge traditional notions of what it means to be a model or a DJ.

FAQs

Q: Who is Arah? A: Arah is a professional model and DJ who has been making waves in the entertainment industry with her unique blend of style, charisma, and musical talent.

Q: What is the Arah 62 project? A: The Arah 62 project is a collaboration between Arah and DJ Models, aimed at showcasing Arah's skills as a DJ and model while pushing the boundaries of creative expression and innovation.

Q: What makes Arah 62 so special? A: Arah 62 is special because of Arah's passion for DJing and music, her dedication to her craft, and the level of creativity and innovation that has gone into the project.

Q: What is the impact of Arah 62 on DJ culture? A: The impact of Arah 62 on DJ culture has been significant, inspiring a new generation of DJs and producers with her passion, energy, and creativity. dj models arah 62

Based on your request, it seems you are referring to a niche or emerging community, likely centered around Indonesian creative culture (implied by "62," the country code for Indonesia, and "Arah," meaning "direction"). While there isn't a widely documented global brand by this exact name, the phrasing suggests a collaborative project involving DJs and models.

Here are three post options tailored for different social media vibes:

Option 1: The "Hype & Energy" Post (Best for Instagram/TikTok)

Caption:Breaking boundaries. ⚡️ Defining the new wave of creative energy with DJ MODELS ARAH 62.

We aren't just following the rhythm; we’re setting the direction. 🧭✨ From the decks to the runway, witness the fusion of sound and style. Stay tuned for what's coming next.

📍 Jakarta / Global#DJModels #Arah62 #IndoCreative #SoundAndStyle #NewWave #JakartaNightlife #62Energy Option 2: The "Community & Vision" Post (Best for Facebook)

Caption:What is the next "Arah" (direction) for our creative scene? 🇮🇩

DJ MODELS ARAH 62 is more than a collective—it's a movement bringing together the sharpest talents in music and fashion. We’re building a space where the 62 spirit meets global standards.

Join the journey. What’s your direction? 👇#Arah62 #DJLife #ModelingAgency #IndonesiaCreative #Collaborate #CommunityFirst Option 3: Short & Mysterious (Best for Threads/X)

Caption:The frequency is changing. 🎧💃 DJ MODELS ARAH 62 | The new standard for the +62 creative pulse. Coming soon. #Arah62 #DJModels #Jakarta

Need to refine this?If "Arah 62" refers to a specific local event (e.g., in Jakarta or Bali) or a particular agency like Boss Models Jakarta (which often manages talent in the region), let me know so I can add specific dates, locations, or names!

Introduction

In the world of mobile entertainment, presentation is everything. While music is the soul of a party, the equipment setup is the face. The Arah 62 DJ Model has emerged as a popular solution for DJs who demand a balance of portability, aesthetics, and functionality. Designed to turn any space into a professional booth, this model represents the new standard for mobile workstations.

Technical Spec Sheet (Example Template)

If you are listing this for sale, include this section:

Material: High-grade Laminated MDF / Aluminum Frame
Dimensions (LxWxH): [Insert Specific Dimensions, e.g., 160cm x 62cm x 95cm]
Weight: Approx. 20-25kg
Color Options: Black Matte, White Gloss, Wood Grain
Assembly: Required (Tool-free assembly often included)

Note: If "Arah 62" refers to a specific niche electronic component or a local Indonesian furniture artisan brand, please clarify the context, and I can adjust the technical details accordingly.

DJ Models Arah 62 is a lifestyle brand and agency founded by

, a professional DJ and model who combines her passions for music and fashion. The brand focuses on personal expression, helping users showcase their individual style through both audio and apparel. Key Brand Offerings DJ & Entertainment Services

: The brand is led by Arah, who performs as a professional DJ. You can find audio samples on their platforms to experience their musical style. Fashion & Merchandise

: They offer a wide range of products that can be purchased ready-made or customized with your own designs: : T-shirts, hoodies, and hats. Accessories : Bags, masks, and stickers. Community & Support

: The brand supports local independent business values and contributes profits to various social and environmental causes. Social Presence and Content

You can find content related to DJ Models Arah 62 on social media platforms like TikTok, where Arah shares high-energy videos of her DJ sets and dance floor moments. For more information, you can visit their official Google Site

to see their latest designs, testimonials, and audio samples. Dj Models Arah 62

"DJ Models Arah 62" merges SoundCloud underground hardtechno/Schranz, represented by artist tags, with G.I. Joe: A Real American Hero #62, a staple in collector markets. The phrase also intersects with broader discussions regarding the intersection of electronic music and fashion, as seen in industry commentary. Explore the audio on SoundCloud. Music tracks, songs, playlists tagged Arah on SoundCloud The Ultimate Review of DJ Models Arah 62:

DJ Models Arah 62: Unveiling the Legacy of a Timeless Design

In the realm of architectural and design models, few names have managed to etch a lasting impression as profoundly as DJ Models, and within their esteemed catalog, the Arah 62 stands out as a testament to innovation and aesthetic sensibility. The Arah 62, a product of meticulous design and engineering, has not only captured the imagination of architects and designers but has also become a cultural icon, symbolizing the confluence of form and function.

The Genesis of Arah 62

The Arah 62's story began in the early 1960s, a period marked by rapid technological advancements and a burgeoning interest in modernist design. DJ Models, founded with a vision to push the boundaries of architectural modeling, embraced this zeitgeist with the creation of the Arah 62. This model was not merely a scaled-down replica of a building or a structure; it was an exercise in minimalism, an ode to the International Style that was gaining popularity worldwide.

Design Philosophy and Features

At the heart of the Arah 62's design philosophy was the pursuit of simplicity and elegance. Characterized by clean lines, rectangular forms, and a predominantly glass and steel façade, the model exuded a sense of modernity and sophistication. The Arah 62 was not just about visual appeal; it was also a marvel of precision engineering. Its components were meticulously crafted to ensure a seamless assembly experience, making it a favorite among architectural model enthusiasts and professionals alike.

Impact on Architectural Modeling

The introduction of the Arah 62 had a profound impact on the field of architectural modeling. It set new standards for detail, precision, and aesthetic appeal, encouraging a shift towards more sophisticated and realistic models. The Arah 62 became a benchmark against which other models were measured, and its influence can be seen in the evolution of architectural models over the decades.

Cultural Significance

Beyond its technical and design contributions, the Arah 62 has also achieved a level of cultural significance. It has been featured in various design exhibitions and has garnered a dedicated following among collectors of architectural models. The Arah 62 serves as a bridge between the past and the present, offering insights into the design sensibilities of its era while continuing to inspire contemporary architects and designers.

Legacy and Continued Influence

The legacy of the Arah 62 is multifaceted. It not only showcases DJ Models' commitment to innovation but also highlights the importance of architectural models in the design process. Today, as the architectural and design communities continue to evolve, the Arah 62 remains a revered piece, a reminder of the power of design to transcend time.

In conclusion, the DJ Models Arah 62 is more than just a model; it is a symbol of an era, a piece of design history that continues to inspire and influence. Its creation marked a pivotal moment in the history of architectural modeling, and its impact is still felt today. As we look to the future, the Arah 62 stands as a testament to the enduring power of good design.

The "Arah 62" specifically refers to the Rane Sixty-Two Go to product viewer dialog for this item. (often stylized as

), a legendary 2-channel battle mixer. Because it is a "battle mixer," the most helpful pieces are those that protect it during travel or improve its ergonomics for scratching and performance. 🛡️ Essential Protection: Flight Cases

A hard case is the single most important piece of gear for a to prevent fader damage and knob breakage. Harmony Cases HC12MIX

: This custom-fit flight case features high-density foam specifically cut for the 62's dimensions. It includes a removable front panel, which allows you to access the headphone jacks without taking the mixer out of the case. Magma CTRL Case Battle-Mixer

: A lighter, hardshell alternative for DJs who don't need a heavy road case. It is made from Durashock molded EVA foam and is more portable for local gigs. ✨ Customization: Faceplates and Skins

is famous for its "battle-worn" look over time. Protective skins can refresh an old unit or protect a new one from scratches. 12inchSkinz Magnetic Faceplate Go to product viewer dialog for this item.

: These are the industry standard. The magnetic version is highly recommended because it stays in place during heavy scratching but can be swapped in seconds without removing any knobs.

StyleFlip Custom Decals : These use 3M bubble-free vinyl, allowing you to upload your own logos or designs for a truly personalized look. 🎹 Performance: Stands and Workspace

Since battle mixers are often used alongside turntables, a stable and angled stand can save your back and neck during long sets. Apache Bulldog Mixer/SYNTH Stand Apache Audio& more Go to product viewer dialog for this item. Arah is a professional model and DJ who

A handmade steel stand that angles the mixer at 55 degrees. This is perfect for home studios where you want the mixer closer to eye level. Rockville RXS20 Portable Mixer Stand Audiosavings& more Go to product viewer dialog for this item. If you need a standalone floor mount, this is

height and width adjustable, making it compatible with the narrow profile of the 💡 Pro Tip: Maintenance

The Legacy of Precision: Exploring DJ Models and the Golden Arrow

For model railway enthusiasts, certain names evoke a sense of high-detail ambition and niche prototyping. One of the most talked-about chapters in recent years has been the rise and fall of DJ Models, founded by Dave Jones. While the company ceased operations in 2019, its contributions to OO and N gauge modeling—particularly the Southern Region electrics—remain highly sought after on the second-hand market. The Crown Jewel: The Class 71 "Golden Arrow"

If you are searching for "Arah" or "Arrow" in the context of DJ Models, you are likely looking for their definitive rendition of the British Rail Class 71. This locomotive was the powerhouse behind the "Golden Arrow" luxury boat train service between London Victoria and Dover.

Exceptional Detail: The DJ Models Class 71 was lauded for its intricate "Golden Arrow" condition, featuring the iconic headboards, flags, and arrows that signaled its status as a premier continental link.

Scale and Precision: Produced in OO gauge, these models featured working pantographs and directional lighting, setting a high bar for fidelity to the original 2,500 hp electric locomotives. Why Collectors Still Search for DJ Models

Despite the company’s closure in June 2019, their models are frequently discussed in hobbyist circles like DJ’s Trains and dedicated forums.

Niche Prototypes: DJ Models focused on specific versions of locomotives (like the Class 71 or the Class 74) that larger manufacturers often overlooked.

Advanced Engineering: At the time of their release, features like the independently controlled lighting and detailed cab interiors were considered top-tier for ready-to-run models.

Historical Accuracy: For those modeling the 1960s era of the Southern Region, the "Golden Arrow" variant is an essential centerpiece. Where to Find Them Today

Since they are no longer in production, finding these "Arrow" models requires a bit of hunting.

Resale Markets: Keep an eye on auction sites and specialized model retailers who stock "pre-loved" inventory.

Collector Forums: Communities often trade these specific models, especially the limited-run versions with full "Golden Arrow" regalia.

While the brand DJ Models has said its goodbye, the "Arrow" locomotives they produced continue to lead the way on layouts around the world, serving as a testament to a short-lived but impactful era of model railroading.

Conclusion

While specific information on the "DJI Model Arah 62" is not available, DJI's range of drones offers advanced technology suitable for a variety of uses. If you're in the market for a drone, consider what features are most important for your needs, whether it's high-quality imaging, flight endurance, or intelligent flight capabilities. Always ensure that you comply with local regulations and respect privacy and safety guidelines when flying your drone.

In the Workshop: Unboxing and Reviewing the Elusive DJ Models ‘Arah 62’

By: The Layout Bench | Date: April 20, 2026

There is a special kind of thrill in the model railway world when you stumble upon a release that feels like a ghost. You’ve seen the renders on obscure forums, heard the rumors at swap meets, but you’ve never actually held one in your hand. Today, we are diving deep into one of those mythical beasts: the DJ Models ‘Arah 62.’

For those unfamiliar, DJ Models carved out a niche for producing high-fidelity, often controversial British outline models before their hiatus. But the ‘Arah 62’ isn't your standard Class 71 or King Class. This appears to be a deep-cut, possibly a limited-run industrial or export prototype.

Here is our honest, hands-on review.

Product Spotlight: The Arah 62 DJ Model

The Prototype: Hunslet 'Arah'

Builder: Hunslet Engine Company
Type: 0-6-0ST Saddle Tank
Date: Circa 1900-1910
Fate: Preserved / Industrial use in North Wales
Significance: Quintessential "Quarry Hunslet"

The 62 Hz Sacrament

Let us speak technically for a moment. 62 Hz is not a sub-bass rumble (that is 40-50 Hz). It is not a kick drum thump (that is 80-120 Hz). 62 Hz lives in the uncanny valley between the chest punch and the stomach growl.

It is the frequency of a large air conditioning unit. It is the hum of a shipping container on a highway. It is infra-ordinary.

The DJ who models Arah 62 knows that true hypnosis does not come from the 4/4 kick at 125 BPM. It comes from the absence of that kick. It comes from the drone. The 62 Hz carrier wave is the canvas. The hi-hats are just the brushstrokes.

To play at 62 (metaphorically) is to play the quietest loud set imaginable. It is to trust that the dance floor will lean in, rather than be pushed.

I received a note from Dennis Polito, W6DEN:

"I wanted to thank you for the fine article regarding this GPS receiver. The information that you compiled made the conversion and start up process relatively easy. I recently purchased one from Hi-tech Cafe and I was able to get it up and running last night. I have a couple of questions for you.

The 10 MHz output as measured on my HP 5345A is a bit high, 10.00000131 to be precise. I compared the output to a HP 5061A Cesium standard and it is indeed off frequency. Satstat reports FFOM as a value of 1. If and when this value reaches 0 will the 10 MHz output then be correct? How long does it normally take for FFOM to achieve 0? I have had the unit on for about 3 hours as the longest power on cycle. I ran the survey and the receiver is now running in hold mode.

Answer - In the manual, HP states that "the receiver typically reaches stable state 24 hours after power-up, and it will learn best if its experiences no holdover in the first 24 hours....thus, it is recommended that the receiver is always kept locked to GPS during the first 24 hours." When FFOM (Frequency Figure of Merit) reaches zero, the 10 MHz output frequency characteristics should meet accuracy specifications of < 1 x 10^-9, one day average.

( Feedback: Dennis later reported to me that another Z3801A was tested and had the same apparent frequency offset. He then found that the synthesizer in his cesium standard was the source of the error.)

My antenna has approximately 70' of RG-58 feed line, should there be a feed line delay factored in? If so, do you know what the delay factor is for this feed line? I get excellent signal strength numbers on all six satellites.

Answer - Since I use my receiver only for frequency purposes, and not for timing, I did not enter my specific feed line numbers into Satstat. That is why the Satstat photo above shows an antenna delay of zero ns. The delay factor is related to the specific velocity factor of your coax. If the cable you use has no additional signal delay time caused by the cable dielectric material (a velocity factor of 100%), the delay factor would be the time it takes light to travel the length of the coax. Light travels almost exactly one nanosecond per foot. RG/58 with a polyethylene dielectric (not foam) has a velocity factor of 66%. The specific calculations:

Speed of Light = 186,284 miles per second.
5,280 (feet per mile) X 186,284 = 983,579,520 feet per second
983,579,520 X (10 ^-9 ) = .98357952 foot per nanosecond
.98357952 x 66% = .6491624832 (speed through RG/58)
1/.6491624832 (one over x function) = 1.5404463842 or 1.54 ns per foot delay

So for your length of cable.....70 feet of RG/58 has a time delay of 107.8 nanoseconds. The HP manual gives some examples of other cables and various lengths.

The Satstat clock reports a +13 second error. The query "show accumulated leap" reports +13 seconds. Can this value be reset to 0?

Answer - You are set up to view GPS time. Setting the time to reflect UTC time (see note by WB6MOB above) will correct this apparent error. Since GPS time is "perfect", it is off from UTC by the number of leap seconds that have been added to UTC since GPS time began in January of 1980. As of today, there have been 13 leap seconds added to UTC to compensate for variations in the earth's rotational speed. More information on this can be seen on the U.S. Naval Observatory web site.

Cliff Ward, W5LF reports: I have two of these fine devices and the Ebay ads say they run on 32 to 48 vdc. I can tell you plainly that neither of mine will even start without 48v or more on them, with or without adding 7-8000pf at 70 of electrolytics across the dc input (which didn't work for me). Mine will start at 48 vdc but won't run at less than 46.7 volts or so.

K8CU notes:The Z3801A is specified by HP (depending upon model) as either a nominal minus 54 or plus 27 volt device. The best bet is to keep the voltage at the nominal value specified by HP. This way any out of specification internal DC to DC converters are satisfied, and the units will perform normally. Reports from other users confirm this.

I had an email exchange a few weeks ago regarding a power supply problem with the Z3801A. I will copy portions of it here: I have just had a very strange and distressing thing happen, and I'd like to ask you if you have any thoughts. I have two Z3801s, bought on eBay some weeks ago. I checked them out with an antenna and computer when I got them, and they seemed to work flawlessly. I put them aside 'til tonight, when a power supply I ordered was available. This is a serious HP multiple-output supply, 0-50V, .8amps.

I connected it to one unit and found the supply voltage jumping around, a flaw I attributed to the switchers inside the Z3801. Putting a 1000uF cap across the leads fixed that, and the voltage settled down to a perfectly steady 48.00V and .560 amps. My intention was to wait 'til the oven warmed up and see how much lower the steady-state current would become. Although I had no antenna or computer connected to the Z3801, it seemed to power up OK. So far, so good. However a few minutes later, the unit died! No lights, zero power drain. Power supply still reading 48.00 volts.

Not having a clue, I figured maybe something went wrong inside the Z3801, so I connected the second one. It powered up, the current read .559 amps, and all was well. Until, a couple of minutes later, it, too, died! Now they're both dead. I have no schematic. I see no fuses. And I can't imagine what I could have done to kill them. OTOH, the coincidence of both dying minutes after power was applied is too much to believe.

So, and I hope you'll forgive me for the unsolicited inquiry, have you ever heard of anything like this? I have the manual for the unit, but no PS or other schematic, and I'm reluctant to rip it apart 'til I've at least asked someone familiar with the unit.

My response was this: Okay, from my standpoint, your power supply is the culprit. Do NOT use it anymore until you are certain what is going on. The good news is that there are fuses inside the unit, and they are in the primary circuit. Go to my web-site, and scroll down to the part of the page that shows the Z3801A power supply. I describe two fuses in the primary circuit. These are different values, but look like little resistors. They are called "Pico" fuses. Look in the lower left hand side of the photograph to see them. An ohm-meter check on them will reveal what their condition is. There is another fuse described in the circuit, but it is used in the outer oven controller.

Hopefully, all that has happened is that your power supply has taken out the primary fuse(s). I suggest building up another power supply (transformer-diode bridge-big cap) and control the voltage with a variable variac on the transformer primary. Then test your receivers with this.

"Ripping it apart" as you describe is no big deal. All you need is a Torx size 10 driver, and simply remove the top cover. Your DC to DC converter is visible, and is right on top. You can check the fuses without removing anything inside the box. Try this, and let me know what you come up with.

The interesting return email response: Hi again! Thought you'd be interested in the resolution of this problem.

1: There's nothing wrong with the power supply
2: There isn't and wasn't anything defective with either Z3801.

Rather, the power supply is TOO GOOD, and there's a subtle design defect in the Z3801. Key is the power supply rating: .8A maximum current, and the fact that the Z3801 uses switching supplies. A switcher characteristic is one of "negative resistance" on the input. To provide a constant power output, as the input voltage decreases, the input current increases. It turns out that with a 48V supply, the Z3801 takes ~.56 amps on turn-on. However, after a few minutes, the current drain sharply increases, presumably because the oven supply is switched on. With a normal high-current supply (or CO battery), this extra few hundred MA wouldn't be noticed. But with a lab supply set to .8A maxiumm, when the oven turns on, the supply is called on momentarily to exceed its output rating. It goes into current limiting, and the output voltage starts to drop.

Enter the Z3801 switcher: As soon as it sees the supply voltage drop, it will try to take more current, causing the voltage to drop even faster. This negative feedback cycle drains the PS output capacitor (and the cap that I added for good measure) fast enough to exceed the energy rating of the picofuse which protects the capacitor by blowing out!

After figuring out this scenario on the way home, I tried a very simple experiment. I INCREASED the PS voltage from 48.00 to 50.50V,its maximum rating. At this voltage, the maximum current (briefly) seems to be about 780mA, and it eventually equilibrates at around 440mA. The "subtle design defect" is the fact that there is no current limiter (other than the fuse) on the input of the switcher. Of course it could be argued that if one uses a heavier supply it's not necessary, but there could certainly be an occasion where primary power is interrupted with a big capacitor remaining across the Z3801 input.

Finally, the most astonishing thing about this adventure is that it only took me a couple of minutes to find a big reel of 3A Picofuses in the stockroom!