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Wednesday, July 16, 2025

JBR Series: High-Precision Trimming Potentiometers

Trimming potentiometers play a critical role in analog circuit design—especially where fine voltage or resistance tuning is essential. Whether you’re calibrating a sensor, adjusting gain in an amplifier, or managing offsets in a comparator circuit, a high-precision variable resistor ensures your system stays stable and predictable.

The JBR Series offers a refined solution for those looking to integrate wirewound trimming potentiometers into tight PCB spaces. Designed for durability, smooth rotation, and low temperature drift, these components are ideal for both prototyping and long-term deployment.

Why Trimming Potentiometers Still Matter

Despite the rise of digital tuning systems, analog adjustment remains indispensable in many applications. A trimming potentiometer—also called a preset resistor or PCB tuning component—offers unmatched immediacy and cost-effectiveness when:

  • Fine-tuning analog voltage dividers or bias networks
  • Calibrating sensor thresholds or analog filters
  • Making post-production adjustments in manufacturing lines
  • Providing re-tuning capabilities without firmware changes

The JBR Series features single-turn and multi-turn potentiometer options with mechanical angles up to 3600°, tight linearity tolerance, and high resistance range—from 50 Ω up to 2 MΩ, depending on the variant.

Technical Highlights That Make the Difference

Engineered with wirewound construction, these potentiometers deliver consistent resistance behavior under thermal and mechanical stress. Designers will appreciate:

  • Stable linearity for repeatable adjustment results (±0.25%–±0.5%)
  • High insulation resistance (up to 1GΩ) and voltage handling
  • Low rotational noise and consistent contact resistance
  • Long life cycles—tested up to 10,000 adjustments

For engineers designing industrial control systems, sensor modules, or analog calibration interfaces, the JBR Series provides confidence in both initial setup and field reliability.

Applications You’ll Recognize

You’ll find these trimming potentiometers in everything from power supply feedback loops to automotive sensor calibration circuits. They’re especially well-suited for environments where analog signal integrity, EMI sensitivity, or thermal variation must be tightly controlled.

Still unsure if a mechanical tuning component is right for your project? Watch the video above to explore real-world implementations and mechanical behaviors of the JBR Series.

For detailed specifications and CAD drawings, visit: jbcapacitors.com

Contact Us

Email: info@jbcapacitors.com
Website: www.jbcapacitors.com

Monday, July 7, 2025

jb JFQF Series: Reliable Polypropylene Film Capacitors

When it comes to reliable AC filtering, not all capacitors are created equal. The jb® JFQF series stands out with its high stability, low ESR, and strong EMI suppression capability—making it an excellent choice for engineers working on UPS systems, solar inverters, and other AC power applications.

This series uses metallized polypropylene film, a material known for durability and self-healing behavior, and offers wide voltage options, including 250VAC, 275VAC, and up to 480VAC.

Whether you're designing a compact power converter or upgrading your AC output filter, JFQF capacitors can deliver the long-term performance and thermal reliability your design demands.

Designed with Practical Use in Mind

Feature Benefit
Self-healing polypropylene film Improved lifespan under voltage stress
Low ESR and high ripple capability Reliable performance in high-frequency switching
Compact, epoxy-filled casing Space-saving design with thermal protection

Download datasheet and review specs →
View JFQF Product Page

Contact Us

Email: info@jbcapacitors.com
Website: www.jbcapacitors.com

JFQF film capacitor for AC filtering

Tuesday, July 1, 2025

How to Solve EMI Noise in AC Circuits with a Compact X1 Capacitor?

EMI noise is a common issue in AC-powered electronic devices. Whether you're designing a switching power supply, a motor driver, or a smart plug, electromagnetic interference can cause instability, reduce performance, or even lead to failure in sensitive circuits.

So, how can engineers effectively suppress EMI in AC circuits without compromising on space or safety?

Use a Certified X1 Film Capacitor – Like jb’s JFT Series

X1 capacitors are safety-certified components designed for EMI suppression between the AC line and neutral. They are tested to withstand impulse voltages up to 4kV, making them ideal for industrial and commercial applications where reliability matters.

The jb JFT series is a compact, high-performance solution designed to meet these exact needs. Built with metallized polypropylene film, the JFT capacitor offers self-healing properties, low dissipation factor, and compliance with IEC 60384-14 (Class X1).

Key Benefits of Using the JFT X1 Capacitor

✔ Compact size — starting at just 13 × 11 × 5 mm, ideal for space-constrained designs 

 ✔ Rated for 300VAC and 440VAC 

 ✔ Capacitance range from 0.0022μF to 4.7μF 

 ✔ Operating temperature from -55°C to +105°C 

 ✔ Insulation resistance ≥ 15,000 MΩ (for C ≤ 0.33μF)

 ✔ Self-healing construction for long-term reliability

Where to Use It?

The JFT series is commonly used in:

  • AC EMI input filters
  • Switched-mode power supplies (SMPS)
  • LED drivers and ballasts
  • HVAC controllers
  • Industrial automation equipment
  • Chargers, adapters, and smart home devices

Why Not Just Use a Ceramic Capacitor?

While ceramic capacitors are compact, they usually lack safety certification and cannot withstand high surge voltages. The JFT X1 capacitor, in contrast, offers:

Feature JFT X1 Capacitor Ceramic Capacitor
EMI Suppression Excellent Moderate
Surge Handling Up to 4kV Limited
Safety Certification Yes (Class X1) No
Fail-Safe Design Self-healing Risk of short circuit
Long-Term Reliability High Medium

Learn More

Want to see this capacitor in action? Check out our video demonstration above or download the official datasheet below:

Final Thoughts

If you're looking for a space-saving, safety-certified solution to suppress EMI in your AC applications, the jb JFT X1 film capacitor is an excellent choice. Its proven performance and compact size make it ideal for both new designs and replacements in existing systems.

Contact Us

Email: info@jbcapacitors.com
Website: www.jbcapacitors.com

Understanding X1 Class Film Capacitors: Why jb’s JFT Series Is a Reliable EMI Filter Choice