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In modern engineering, precision fluid control is vital across industries ranging from electronics manufacturing to medical device design. Peristaltic pumps, with their distinctive squeeze-and-release mechanism, deliver exceptional reliability, cleanliness, and accuracy in fluid transfer. By preventing direct contact between the pump and the fluid, they ensure contamination-free operation while reducing maintenance demands.

This post explores the fundamentals of peristaltic pumping and how electric-drive systems help engineers achieve the perfect flow in today’s most demanding applications.

Peristaltic pump vs. electric peristaltic pump

A peristaltic pump refers to the general pumping principle: fluid is moved through flexible tubing by a rotating squeeze-and-release motion. This design ensures accurate flow and prevents contamination since the fluid never touches the pump components.

An electric peristaltic pump, however, is a specific implementation powered by an electric motor. The motor provides consistent speed, programmable control, and higher precision, making it ideal for industrial automation, laboratory dosing, and electronics manufacturing processes. While the term “peristaltic pump” covers the entire category, “electric peristaltic pump” highlights the modern, motor-driven versions that engineers rely on for efficiency and repeatability.

Figure 1 A sample of today’s compact electric peristaltic pump—this battery-operable low-voltage DC motor version demonstrates modern design efficiency. Source: Author

Peristaltic pumps vs. dosing pumps

A dosing pump is a broader category of pumps designed to deliver exact volumes of fluid at controlled intervals. Peristaltic pumps can serve as dosing pumps when paired with electric drives and programmable controls, but other pump types—such as diaphragm or piston pumps—are also used for dosing applications.

In short, all electric peristaltic pumps can function as dosing pumps, but not all dosing pumps are peristaltic. Understanding this distinction helps engineers select the right solution depending on whether the priority is contamination-free transfer, chemical compatibility, or ultra-precise dosing.

As a quick aside, it’s worth noting the distinction between DC-motor-driven and stepper-motor-driven peristaltic pumps. DC motors provide continuous rotation with simple speed control, making them cost-effective and compact for general fluid transfer.

Stepper motors, on the other hand, deliver precise incremental motion, enabling highly accurate dosing and repeatability. The choice between the two depends on application requirements: DC motors excel in straightforward pumping tasks, while stepper motors are favored in laboratory and industrial settings where precision is paramount.

Figure 2 A stepper-motor peristaltic pump delivers responsive start-stop and reverse operation, offers a wide speed range, and ensures reliability, thus meeting the accurate and dependable flow control demanded by precision instruments. Source: Author

The inner workings of peristaltic pumps

At the heart of a peristaltic pump is a simple but ingenious principle: fluid is transported by compressing flexible tubing in a controlled sequence. As rollers mounted on a rotating rotor travel along the tubing, they push the fluid forward in discrete segments, creating a smooth, continuous flow. Because the fluid remains fully enclosed within the tubing, there is no risk of contamination or contact with mechanical components, making this design particularly valuable in sensitive applications such as pharmaceuticals.

The internal structure of a peristaltic pump reflects this principle with elegant simplicity. A rotor fitted with rollers or shoes provides the pressure needed to move the fluid, while the tubing’s elasticity ensures it returns to its original shape after each cycle. The pump housing supports and guides the mechanism, ensuring consistent operation.

This combination of mechanical precision and material resilience allows peristaltic pumps to deliver accurate dosing, reliable performance, and easy maintenance—qualities that make them indispensable in modern engineering systems.

Figure 3 Drawing simply depicts the mechanisms of single-roller and multi-roller peristaltic pumps. Source: Author

As a closely related note, industrial peristaltic pumps differ from those used in general and medical applications. Industrial designs often employ shoe mechanisms to achieve higher pressures and rugged performance, making them suitable for chemical transfer, mining, and other heavy-duty environments where durability is paramount.

By contrast, general-purpose and medical pumps typically rely on roller mechanisms, which minimize friction, reduce energy consumption, and extend tubing life—qualities essential for precision dosing, sterility, and reliable operation in laboratory and healthcare settings.

And when powered by an electric motor, the same mechanism gains programmable control, variable speed adjustment, and enhanced precision. Electric peristaltic pumps transform the fundamental design into a highly versatile dosing system, capable of delivering exact volumes with repeatability. This evolution from a simple mechanical concept to an automated solution makes them indispensable in neoteric engineering environments where accuracy, efficiency, and reliability are non-negotiable.

Pulsed flow: Quick pointers for makers and engineers

Now to a few compact cues and practical insights to keep your designs flowing with precision. First off take note that motor choice sets the tone for performance: DC drives are cost-effective for simple transfer tasks like irrigation or fluid circulation, while stepper motors deliver the precision required for accurate dosing.

Roller mechanisms are especially suitable for medical and laboratory applications, since they minimize friction, extend tubing life, and provide gentle, contamination-free fluid handling. They also make an excellent choice for hobbyist projects, offering simplicity, reliability, and low maintenance for makers experimenting with fluid transfer.

By contrast, shoe mechanisms are designed for rugged industrial environments where higher pressures are needed, though they accelerate tubing wear. Tubing selection is equally critical; silicone ensures biocompatibility, PVC covers general transfer needs, and specialized elastomers withstand aggressive chemicals.

Now recall that roller pumps themselves come in single-roller and multi-roller designs. Single-roller pumps are mechanically simpler, lower-cost, and easier to maintain, making them suitable for basic transfer or hobbyist projects where flow smoothness is less critical.

Multi-roller pumps, by contrast, provide smoother, more continuous flow with reduced pulsation, which is essential in medical and laboratory applications where dosing accuracy and patient safety matter. While multi-roller designs increase complexity and cost, they extend tubing life and deliver higher precision, making them the preferred choice in food and beverage industries as well.

Also, electric drives add programmable control and variable speed, enabling integration with MCUs or PLCs for automation, while compact low-voltage battery-operated designs balance efficiency with portability in point-of-care devices. Notably, to mitigate the risk of power outages, contemporary electric peristaltic pumps for medical applications are frequently equipped with hand cranks for manual fluid delivery.

In today’s market, DC drive versions are available with more than just a regular DC motor—many include extra leads for speed control inputs (often via pulse width modulation), tachometer outputs, and other control/feedback signals. These additions give designers greater flexibility in monitoring, closed-loop control, and seamless integration with modern embedded systems, making even basic DC drives far more versatile than before.

Figure 4 Datasheet snippet highlighting a brushless peristaltic pump that delivers multiple features, including speed and direction control. Source: Binaca Pumps

Maker tip: PPM-controlled “digital” peristaltic pumps simplify automation by emulating the behavior of standard RC servo motors. Because the motor driver is integrated directly into the pump, you can skip the complex external circuitry usually needed to manage speed or direction. This lets you control the pump directly from a microcontroller’s digital pin using standard libraries—saving you both space and setup time (here is a practical example).

Frankly, when it comes to real-world control challenges, few are as nuanced as those involving peristaltic pumps. The core difficulty stems from two inherent characteristics of their operation. First, these pumps often run at very low speeds, sometimes down to a complete standstill depending on the application. Second, the motor experiences highly variable loads as the rollers engage and disengage with the flexible tube.

For most of the rotation cycle, the rollers move smoothly along the tube with minimal changes in torque or fluid pressure. However, at the points of disengagement and re-engagement, the system encounters sharp pulses in both torque and pressure.

That is, the combination of low-speed operation (which challenges velocity controllers) and cyclic load fluctuations (which creates non-linear disturbances) is exactly what makes these pumps “fussy” to control. Addressing these dynamics requires specialized motion control strategies—but that is a topic for another discussion.

Closing note: Peristalsis in engineering form

I have more to share but let me close with the fundamentals at this time.

Peristaltic pumps are a class of positive displacement pumps inspired directly by biology. Just as peristalsis in the digestive tract moves food through rhythmic muscle contractions, these pumps transport fluids by progressively deforming flexible tubing with rollers or shoes. The motion sweeps fluid forward, but because the swept length is always less than the tubing circumference, each rotation introduces a brief pause, resulting in the characteristic pulsed flow.

Designs vary between fixed and variable occlusion systems: fixed occlusion maintains a constant compression force, while variable occlusion allows adjustment via springs to fine-tune performance. Accuracy is further influenced by the slip factor, a correction term that accounts for incomplete tubing recovery and backflow, which can cause measured dispense rates to differ from theoretical values.

In peristaltic pump engineering, slip refers specifically to tubing recovery and backflow losses, which differs from the slip factor used in turbomachinery but serves the same purpose of correcting theoretical versus actual flow.

In essence, peristaltic pumps mirror a biological process with engineering precision—balancing simplicity, safety, and adaptability across a broad range of applications. In healthcare, they provide sterile infusion for IV therapy, dialysis, and precise drug delivery. In laboratories, they handle chemical dosing, reagent transfer, and bioprocessing where purity is paramount. Industrially, they manage viscous fluids, corrosive chemicals, and food-grade materials without risk of cross-contamination.

In the food and beverage sector, they support hygienic transfer of juices, dairy, and brewing ingredients. For hobbyists, they simplify aquarium maintenance, hydroponics, and small-scale brewing. In agriculture, they excel at nutrient dosing in irrigation and supplement delivery in animal farming. Their gentle, pulsed flow and hygienic design make them a versatile solution wherever controlled, reliable fluid handling is required.

As you explore these designs in your own projects, consider how roller choice, hose selection, occlusion type, and modern drive features can shape performance, and share your insights to keep the conversation on precision fluid handling moving forward.

T. K. Hareendran is a self-taught electronics enthusiast with a strong passion for innovative circuit design and hands-on technology. He develops both experimental and practical electronic projects, documenting and sharing his work to support fellow tinkerers and learners. Beyond the workbench, he dedicates time to technical writing and hardware evaluations to contribute meaningfully to the maker community.

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Deepak Shankar, founder of Mirabilis Design and developer of VisualSim Architect platform for chip and system designs, has created this cartoon for electronics design engineers.

The post The system architect’s sketchbook: The buildout frenzy appeared first on EDN.

National, 24th April 2026: As data centers and 5G networks become the backbone of AI-driven innovation and digital transformation, the need for precise, resilient timing solutions has never been more critical. Timing is not just a technical requirement, but rather a strategic enabler for high-performance, scalable infrastructure. Microchip Technology (Nasdaq: MCHP) today announces its MD-990-0011-B family of plug-in timing modules, delivering turnkey, high-precision synchronization for data center servers and 5G virtualized Radio Access Networks (vRAN).

Developed in collaboration with Intel, the MD-990-0011-B timing module is designed for seamless compatibility with Intel® Xeon® 6 SoC-powered server platforms, supporting both OEMs and ODMs in building future-ready systems. By leveraging Intel’s foundational vRAN architecture, the module enables robust, low-latency time synchronization, which is essential for distributed AI workloads and real-time applications.

Engineered for the reliability and scalability required by cloud infrastructure, virtualization, and high-availability deployments, the MD-990-0011-B supports automatic source selection and locking across Global Navigation Satellite Systems (GNSS), Synchronous Ethernet (SyncE), and Precision Time Protocol (PTP). This flexibility supports continuous, accurate timing even as network demands evolve.

“Timing is the invisible force that guides the world’s most transformative technologies. With the MD-990-0011-B timing modules, Microchip enables designers to address timing requirements proactively, whether at the outset or during upgrades,” said Randy Brudzinski, corporate vice president of Microchip’s frequency and time systems business unit. “Our plug-in solution eliminates the complexity of custom timing circuits, providing integration and reliability, accelerating innovation and reducing time-to-market for data centers and 5G networks.”

“Microchip’s MD-990-0011-B Timing Module aligns with Intel’s commitment to enable next-generation infrastructure by providing scalable, high-performance platforms that are ready for the demands of 5G, AI and cloud computing,” said Mike Merluzzi, GM of radio access networks at Intel Corporation. “By simplifying timing integration and enhancing reliability on Intel Xeon 6 SoC-powered platforms, we’re helping customers accelerate innovation and deployment.”

Delivering exceptional precision in time and frequency accuracy, along with robust holdover capabilities, the MD-990-0011-B timing modules are available in two variants. The MD-990-0011-BC01 offers 8 hours of holdover performance, while the MD-990-0011-BA01 offers 4 hours of holdover performance. These timing modules consolidate several of Microchip’s advanced technologies into a single, highly integrated solution. Key components include:

• Synchronous Ethernet (SyncE) Synthesizer (ZL80132B): Features two independent Digital Phase-Locked Loop (DPLL) channels for flexible and resilient synchronization
• Oven Controlled Crystal Oscillators (OCXOs, OX-22x): Engineered to provide up to 8 hours of holdover, ensuring stable timing during GNSS outages or network disruptions
• MCP9808 Temperature Sensor supporting enhanced environmental monitoring, 24LC024 EEPROM implementing board configuration, and VC-820 for low jitter performance

• Application image: www.flickr.com/photos/microchiptechnology/55091198450/sizes/l

The post New Plug-In Timing Module Delivers Precise, Reliable Synchronization for Data Centers and 5G Networks to Meet the Demands of AI and Next-Generation Connectivity appeared first on ELE Times.

Obtain tighter stop band impedance variance via the techniques detailed in this tutorial.

Input impedances presented by lowpass and highpass filters in their respective stop bands are usually not controlled and can vary quite widely. Sometimes though, we’d like to have a little better control of them.

For example, tee-configuration low-pass filters and high-pass filters exhibit input impedances and frequency responses which are typified in the following sketches:

Figure 1 A typical tee-configuration low-pass filter delivers non-ideal results.

Figure 2 A typical tee-configuration high-pass filter also delivers non-ideal results.

For tee-configuration filters, the presented input impedance in the passband tends toward the load resistance value, but in the stopband, the presented input impedance rises without limit. That essentially uncontrolled and rising impedance can create stability problems for some kinds of driving devices delivering input signals to such filters.

There is at least a partial remedy for this impedance issue possible, as follows:

Figure 3 A tee-configuration filter pair provides at least a partial remedy.

Using both a low-pass and high-pass filter, with each feeding its respective load, the input impedance becomes controllable both in the passband and the stopband of whichever filter you decide is the intended signal path. Input impedance and frequency responses would take on the following forms:

Figure 4 Controlled impedance filtering can improve stability.

The corner frequency impedance null doesn’t go away, but the input impedance both above and below that corner frequency tends to the load resistance values, chosen here as fifty ohms, which may help make a driving amplifier more stable.

John Dunn is an electronics consultant and a graduate of The Polytechnic Institute of Brooklyn (BSEE) and of New York University (MSEE).

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The post Filter impedance control appeared first on EDN.

As industrial environments rapidly evolve with the integration of operational technology (OT) and information technology (IT), the demand for seamless connectivity and reliable power delivery has never been higher. The proliferation of smart devices, such as sensors, controllers, cameras and robotic arms, has made data indispensable to modern factories and process industries.

To meet the increased demand, more industrial IoT (IIoT) device manufacturers are turning to Power over Ethernet (PoE) as a preferred solution, leveraging its unique ability to deliver both power and data over a single cable. This convergence is enabling smarter, more flexible and efficient industrial operations, while simplifying deployment and maintenance for end users.

Figure 1 Industrial environments are increasingly integrating operational and information technologies. Source: Microchip

What’s Power over Ethernet (PoE)?

Power over Ethernet (PoE) is a technology that allows electrical power and data to be transmitted simultaneously over standard Ethernet cabling. It was first introduced by PowerDsine in 1998; the company was later acquired by Microchip Technology. The Institute of Electrical and Electronic Engineers (IEEE) introduced the first IEEE 802.3af standard in 2003.

PoE was initially developed to power devices like IP phones and wireless access points without the need for separate power supplies. Since then, PoE standards have evolved to include IEEE 802.3 af/at/bt supporting higher power levels and a broader range of devices, making it a cornerstone technology for modern networking encompassing industrial automation and IIoT deployments.

Why IIoT manufacturers are turning to PoE

For IIoT device manufacturers, PoE offers a host of compelling benefits. PoE simplifies deployment by combining power and data in a single cable, eliminating the need for separate electrical wiring and reducing installation complexity and cost. It enables flexible placement of devices, allowing installation in remote, hard-to-reach, or hazardous locations where traditional power sources may be unavailable or cost-prohibitive.

PoE also supports unified network architecture, streamlining network design and making it easier to scale and adapt to changing operational needs. Reliability and compliance are enhanced, as standards-based PoE delivers safe, low-voltage DC power, supporting regulatory compliance and minimizing electrical hazards.

Additionally, offering PoE-powered devices can provide manufacturers with a competitive advantage in a crowded market by delivering a more convenient, integrated solution to customers.

Overcoming PoE deployment challenges in industrial settings

Despite its advantages, deploying PoE in industrial environments is not without challenges. One of the primary obstacles is the limited availability of PoE-enabled network infrastructure. Many existing industrial networks lack PoE switches, and even when available, these switches may not provide sufficient power on every port to support all connected devices.

The cost and complexity of upgrading network infrastructure can be prohibitive, especially in legacy facilities. Other challenges include limited access to power, as not all areas of a factory or plant have easy access to network cabling or power outlets, making device placement difficult. The high cost of power delivery can also be a concern, as retrofitting facilities to support PoE can be expensive and disruptive.

Compatibility concerns must be addressed to ensure that PoE-powered devices work seamlessly with existing network equipment, avoiding downtime and support issues. Finally, scalability is a challenge, as the number of connected devices grows, so does the demand for reliable, scalable power solutions.

Introducing PoE midspans: Supplementing network power

To address the challenge of limited PoE-enabled infrastructure, many industrial facilities are turning to PoE midspans, also known as injectors, to supplement network power where it does not exist. A PoE injector is a device that sits between an Ethernet port that is not supplying PoE and the powered device, injecting power into the Ethernet cable so that both data and power are delivered to the endpoint.

This approach allows manufacturers and customers to deploy PoE-powered IIoT devices without the need to replace existing switches or overhaul network architecture, making it a cost-effective and scalable solution for expanding PoE coverage in industrial environments.

Figure 2 PoE midspans inject power into the Ethernet cable. Source: Microchip

PoE industrial injectors vs. standard indoor injectors

While standard indoor PoE injectors are suitable for office or commercial settings, industrial environments demand more robust solutions. PoE industrial injectors are specifically designed to withstand the harsh conditions often found in factories, processing plants, and outdoor installations.

These injectors feature ruggedized construction, enabling reliable operation in environments with extreme temperatures, humidity, dust, and vibration. They support an extended temperature range, ensuring consistent performance in both hot and cold conditions.

Enhanced safety and compliance are also critical, as industrial injectors meet stringent safety and regulatory standards, providing low-voltage, standards-compliant DC power that minimizes electrical hazards. Industrial PoE injectors support higher power levels—such as IEEE 802.3bt up to 90 W—to accommodate demanding devices and are designed with robust surge protection, which is essential in industrial environments where electrical surges from machinery or harsh conditions are more common.

Flexible mounting options, such as DIN rail, wall, or rack installations, accommodate diverse deployment scenarios. Reliability and longevity are ensured through components and enclosures designed for continuous operation, providing long-term durability and minimal maintenance. These features are essential for maintaining uptime, safety, and performance in industrial settings, where environmental challenges and operational demands are far greater than in typical office environments.

Figure 3 Here is a visual comparison between standard indoor midspan (above) and industrial midspan (below). Source: Microchip

What to look for in a PoE solution provider

For IIoT device manufacturers and customers deploying PoE-powered devices, selecting the right PoE solution provider is critical. Proven compatibility is essential; the provider’s injectors should be tested and validated for seamless operation with a wide range of industrial devices, reducing the risk of downtime and support issues.

Flexible power options are important, with support for various power levels and device types to meet diverse application needs. Reliability and compliance should be prioritized, ensuring solutions meet industry standards for safety and performance, supporting regulatory requirements and minimizing risk.

Ease of installation is also key, with plug-and-play solutions that leverage existing Ethernet cabling to simplify deployment and reduce installation time. Rugged design is necessary for industrial-grade injectors, offering robust construction and extended temperature ranges for reliable operation in challenging environments.

Finally, strong technical support and post-sale service from the provider can help resolve compatibility issues and ensure long-term satisfaction. By prioritizing these features, manufacturers and customers can ensure successful, scalable, and reliable PoE deployments in industrial environments, unlocking the full potential of smart IIoT devices.

Alan Jay Zwiren is senior marketing manager of Microchip Technology’s Networking and Connectivity Business Unit.

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