How to Save Money When Buying Digital-Analog Hybrid Systems

Author: Friday

Jul. 21, 2025

Power Supplies: Analog Control or Digital Control - Astrodyne TDI

A power supply has the important role of converting incoming AC voltage into smooth DC voltage for the application. Traditional power supplies are analog, but digital power supplies have introduced more flexibility and capabilities.

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Typically, when discussing the distinction between analog and digital power supplies, we're really looking at just one circuit. Power supplies rely on a power conversion circuit, a supervisory control circuit, and a control circuit. The control circuit is the one under scrutiny. The power supply itself is usually still analog-based, and power supplies can even use both analog and digital control systems.

While the features of digital power supplies are useful, they also introduce new challenges. Let's explore the difference between analog control and digital control systems and how you can choose the right one for your application.

What Is an Analog Power Supply?

An analog-controlled power supply uses an analog control circuit. This circuit delivers feedback to the primary control circuit with conventional voltage or current sensing systems, error amplifiers, and optocouplers. It can monitor and control output voltages and the power factor correction (PFC). However, if parameters need to be changed, you must change the hardware or design of the circuit.

What Is a Digitally Controlled Power Supply?

A digitally controlled power supply has a digital circuit that can accomplish the same functions as an analog circuit. It can use sample and hold, digitally perform the comparison, communicate with the primary control circuit, and manage the power conversion circuit. These tasks can be managed by a microcontroller, field-programmable gate arrays (FPGAs), or an application-specific integrated circuit (ASIC). Typically, controls can be located via a screen on the power supply or a software program.

An external host controller can intervene and change the performance in real time by changing target parameters, such as gain and frequency response. Engineers can achieve a wide range of performance variations with simple firmware updates, as opposed to hardware swaps. It offers more flexibility by allowing you to create a generic system and program it according to specific needs. That generic circuit then supports a wide array of power conversion products with simple reprogramming.

Although it might be more complex, it delivers virtually unlimited flexibility for development, manufacturing, and even field service. Supervisory functions can also work with analog or digital circuits.

Analog Control vs. Digital Control for Your Power Supply

The best control method will depend on your application, and the primary difference comes down to flexibility. If you only need your power supply to operate at specific parameters, such as its input, output, wattage, and form factor, you can often save money with an analog-controlled power supply. However, if demands change or the performance isn't quite right, you'd need to either buy another power supply or contact the vendor to make modifications.

Many users need to make regular changes to meet target performance. In these cases, a digitally controlled power supply can meet these flexibility demands without time-consuming adjustments to the hardware. Another option is to use a hybrid system. These systems use analog controls, but the parameters can be set and managed digitally. With the best of both worlds, hybrid power systems are a great way to get flexibility and high performance.

Why Use an Analog-Controlled Power Supply

Analog is a tried-and-true type of design with several benefits:

  • Better core power conversion: Analog controls are very stable and offer exceptional performance that's less prone to problems in the current.
  • Better availability: Since analog-controlled power supply units are older, they're more common and easy to find. They can also be more affordable.
  • Shorter design cycles: The popularity and simplicity of the design mean it's usually much faster to create analog power supplies for different applications. More engineers know how they work.
  • Fewer bugs: With such thorough testing and simple designs, analog-controlled power supplies usually have fewer bugs and glitches.

Despite those advantages, analog power supply controls are missing out on some useful capabilities that digital solutions have to offer. Most notably, they're inflexible. Making any changes to the parameters requires adjustments to the hardware or design. It's best suited for applications that don't require this kind of modification. Analog-controlled power supplies also lack advanced monitoring and control capabilities. For example, you can monitor the status, but control is limited to one reaction per parameter.

Generally, the best applications for analog-controlled power supplies are those that use one set of parameters, won't need to be frequently changed and aren't so critical that they need extensive monitoring.

Why Use a Digitally Controlled Power Supply

The benefits of digitally controlled power supplies include:

  • Design versatility: Digitally controlled power supplies offer many options. You can control them remotely, set limits on currents and output voltages and add alarms at certain levels.
  • Ease of implementation: Digital controls are also much easier to set up and modify. Any changes can be programmed and might require a firmware download, but time-consuming and costly hardware changes aren't necessary.
  • Long-term management tools: With a digitally controlled power supply, you can also use more monitoring tools to access detailed information that can help predict failures. For example, ongoing monitoring of fan performance and temperatures could help you identify problems and conduct maintenance before it turns into downtime.
  • Faster integration of new systems: As with parameter modifications, digital controls are more suited to adapt to new systems and setups.

Of course, there are some challenges that come with going digital. The increased complexity requires some sophisticated software and can be difficult to troubleshoot.

Hybrid

Another option is to use both analog and digital controls. This combination uses an analog controller with a digital interface, such as I2C, PMBus or CANBUS. The analog controller can offer the strong, steady performance it's known for, while the digital interface delivers improved communication. It takes advantage of analog's high availability, short design cycle, and minimal bugs, and the digital interface delivers control and monitoring solutions.

Find the Right Solution With Astrodyne TDI

Here at Astrodyne TDI, we know that no two applications are the same. That's why we offer a wide range of power supplies and can offer custom solutions for your installation. Our knowledgeable team can help you find or create the right power supply for your needs. We're well-versed in meeting strict requirements for industries like medicine and military.

The Complete Guide to Hybrid Analog/Digital Workflow - Dan Finnen

I’m certainly not an authority on either film or digital technology, but over the past few years I’ve stumbled upon a photographic workflow that, for me, takes the best of both worlds and puts it in a single process. The workflow I use is one that is only possible with the newest innovations in computer manipulation as well as many techniques as old as film itself.

In the most basic of terms, I start out with a film capture, develop the film, scan the film, then use the digital file as the basis of my image, which I then refine and develop in Photoshop. This process allows me to get organic grain and use awesome film gear, yet still have the flexibility in post that digital affords.

It’s nothing new or all that innovative, but I thought I’d share the details of my workflow since it’s an increasingly common one these days. I’ve worked out some kinks and maybe you’ll find some interesting morsel of information to help you on your way.

STEP ONE: FILM CAPTURE

What’s great about this method is that you can use any film format you like as long as you have the appropriate scanner. Personally, I use instant films, 35mm, and a smattering of medium format.

There are a million great books on how to use a film camera, so I’m not going to bother going over anything about how to take a good film photo. However, if you’re going to go down this route, the better your original snap is, the better material you’ll have for later. You can salvage an under or overexposed image sometimes, but you’ll have to make compromises. Obviously, your choice of film will have a huge impact on how easy it will be to expose correctly.

If you’re going to be using Polaroid or Impossible Project films, make sure you protect your photos as soon as you take them. Both can leak chemicals and should be kept out of sunlight for the first few hours of development. I have a specific pocket in my Think Tank bag just for exposed Polaroids.

In traditional film workflows it is important to decide if you are going to shoot black and white or color. With this workflow, you can always shoot color and just convert it to black and white when it’s in the digital stage, but I’ve found that when I use black and white film I take better black and white photos, and vice versa with color.

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STEP TWO: DEVELOP THE FILM

If you’re shooting Polaroid or some other type of instant film, the second after you press down the shutter your photo is already developing. The process will continue for a few minutes, then stabilize a bit, and then continue developing for days, if not weeks. Different films will do different things, which I cover in detail in my reviews of individual instant film types.

If you’re shooting 35mm or medium format, go ahead and get your roll developed. Personally I don’t bother with developing my own film, but if you have the time and resources, go for it! Because I’m cheap, I drop off my 35mm color print film at Walgreens or Costco (the best deal of the two). The person working behind the counter doesn’t care too much about your film, so expect scratches, dust, and fingerprints on your negatives. This can be a big deal, because that negative is what we’re going to be scanning. Make sure you clarify you don’t want prints, because they cost a lot of money and usually look like garbage.

If you’re shooting that’s not 35mm color negative or just want your pictures properly cared for, specialty photo shops are your best bet. When I was in Indiana I used Jack’s Camera Shop; now I use Phoenix Imaging in Chicago. I’ve always been happy with the service I received at both, but it certainly costs more than Costco or Walgreens.

( update: since I wrote this article several years ago, both Costco and Walgreens have shut down their film processing programs. Pretty much the only options left are mailers and dedicated film development houses.)

Every place you get your film developed at will give you the option of getting digital scans. Be warned, they’re almost always hideous. I sometimes get my 35mm scanned if it’s cheap just so I have an easy way to preview images. The scanners Walgreens and Costco use are low resolution and have weird auto color/contrast correction that will often destroy your image. Some photo shops offer high resolution scans, which are very good, but also incredibly expensive. It’s cheaper in the long run to just invest in your own scanner if you have the money. However, it’s much more convenient (and expensive) to just let a high end scanning facility handle it for you.

Once you have the raw material ready, be it negatives, slides, or instant photos, you’re ready to move on to the next step!

STEP THREE: SCAN THE FILM

Scanner technology is weird. Flatbeds have gotten better and cheaper, but dedicated 35mm and medium format scanners have been pretty much left for dead. This is the step that has caused me the most headache perfecting over the years, but I’m pretty happy with my current setup.

For Polaroid and other instant photos, I use a dedicated flatbed scanner. Avoid scanner/printer combos, as the scanner is usually fairly low quality in those machines. I started out using an old giant Epson scanner in a library basement with decent results, but now I have my own CanoScan F that I use. The CanoScan F is cheap, fast, and very good, so if you’re scanning Polaroids I highly recommend it. I’ve also heard many great things from other film shooters about Epson flatbeds.

Make sure your Polaroid photo is clean, with no dust on the front and no chemical paste leaking out the back before placing it in the scanner. If your scanner lid isn’t heavy, put some weight on the top so that the photo is completely flattened. If not, then the glossy cover can create some weird color banding.

( update: I’ve reviewed the Impossible Project scan adapter and highly recommend it for Polaroids if you can get your hands on it.)

When using unstable Impossible Project films, you’re probably going to want to scan the film at least twice. Scan your photo once as soon as you get done shooting (especially if you like how it looks), since it will almost certainly continue changing and developing as the days go by. I usually do my ‘final scan’ about two days after exposure. This is when colors show the most contrast, immediate defects are minimized, and long term humidity damage hasn’t yet set in. When I’m using humidity damage effects to my advantage, I’ll rescan again weeks and even months after exposure.

I’ve experimented with several different types of scanning software on different operating systems, but the best seems to the free image capture program built into Mac OS. It’s simple and doesn’t create any weird digital artifacts. I set my settings for dpi resolution TIFF files with billions of colors. Be warned, this creates MASSIVE files. My quad core Windows gaming PC can barely keep up with them, and my Mac struggles to even load one of the files. If you’re on a slower machine, dpi will probably be enough quality and won’t make your processor beg for mercy.

I also use my CanoScan F for my medium format jobs. 120 negatives are so huge that I can easily get enough quality even with an affordable flatbed. The CanoScan scans though glass, and as a result, it’s not all that sharp and will blur the grain together. Because medium format is gigantic, this isn’t a big deal. However, with 35mm optimal results will only come from a dedicated film scanner.

In my opinion Nikon made the absolute best film scanners. The key word there is made. Unfortunately, Nikon decided they don’t need to make them anymore, driving the demand up for the few used ones surviving in the wild. Current generation Nikon Coolscan and s will run you thousands upon thousands of dollars, so I went the slightly cheaper route by getting a Nikon Coolscan V. It makes huge, awesome quality scans that are almost too sharp by some standards. I would avoid the Nikon Coolscan IV and below, as they’re too old to be any use.

The technology in the Nikon Coolscan V is still top notch, but the software for it is stuck back in . You’re going to need Windows XP and Nikon’s dedicated scanning program, which you can conveniently download from their support site for free. VueScan works as well, but I like Nikon’s dedicated program better. I installed an ancient copy of Windows XP professional through boot camp on my Mac just to use this scanner, but I’ve heard that newer Windows 32 bit systems can still operate the scanner in compatibility mode if you’re particularly computer-savy, but I haven’t tested it myself. Sorry Mac OS X users, unless you have Tiger running somewhere, you’re out of luck.

There’s way too much involved in this step to jam into this article, so mosey on over to my Coolscan V guide and review for more information about using this particular piece of machinery.

Once you’ve gotten your raw scan, don’t freak out if it looks nothing like you expected. Colors might be doing weird things if you used color negatives, or maybe your Polaroid looks all washed out. All that can be fixed in the next step…

STEP FOUR: DEVELOP DIGITALLY

What’s great about using the super high resolution scans one can get from the CanoScan F and Nikon Coolscan V is that they give you tremendous amount of creative freedom in post. If you want to increase brightness by several stops, have right at it. Instead of gross digital grain and artifacts, you’ll just highlight the film grain that’s already there. Film grain is the entire reason to bother with this workflow, so if you’re working to hide it or use an anti-grain filter, you’re kind of missing the whole point. Digital capture might be more up your alley.

Most of the time I do try to get rid of distracting dust, and believe me, there will be a lot of it. If you use cheapo development like I do, you’ll also have scratches to contend with. There are automated dust removal systems built into both Canon and Nikon’s scanning software, but since I don’t trust the machines, I remove these defects manually. If you’re a glutton for punishment, you can use clone stamp tools in Lightroom and Photoshop CS4 and before. Personally, I much prefer the miraculous healing tool in Photoshop CS5 and newer. It mimics the grain around it fairly well and, best of all, is super fast. Either way, be cautious not to make weird smear marks or discolored areas that make it obvious something was changed.

After the dust is removed, have at it. With Polaroid photos, I usually try to get the image to look like the actual image in real life. This usually involves slightly heightening colors, contrast and restoring the blacks. I also prefer to crop out the white border around the Polaroid image as to focus on the actual picture itself rather than the medium. In film I change everything and anything until I get something I like; I don’t have any set rules.

Whew, that’s about it! From here on out it’s up to you.

Most of what you see in my photo galleries goes through this process. I would never recommend this workflow for anybody in a hurry or on a tight budget, but I find it to be quite a bit of fun. Take your time and you’ll be surprised at what you can create. It all comes down to the image you want to communicate and how you want to say it. Scanners, cameras, film, lights and flashes are all just tools to help make your vision a reality.

Good luck!

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