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CBM-443BF AM/FM Dual Variable Capacitor 270PF + 20PF Radio
CBM-443BF AM/FM Dual Variable Capacitor 270PF + 20PF Radio
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CBM-443BF Thin Film Dual Variable Capacitor for AM/FM Radio Tuning Circuits
The CBM-443BF Dual Variable Capacitor is a compact, high-quality thin film (PVC) variable capacitor designed for AM/FM radio tuning circuits, medium and short wave radios, and crystal/ore radio projects. Whether you're a hobbyist building a radio from scratch or an electronics enthusiast repairing a vintage set, this dual-gang variable capacitor delivers reliable, precise frequency tuning in a small, durable plastic housing.
Key Features
- Model: CBM-443BF
- AM Section: 2 × 270PF dual variable capacitance with 4 fine-tuning capacitors (gang: ~4 × 270PF total)
- FM Section: 2 × 20PF dual variable capacitors (usable in conjunction with the 270PF group)
- Construction: Thin film (PVC) dielectric — smooth, stable tuning action
- Mounting: M2.5 mounting nut for secure, standard panel installation
- Housing Material: Durable plastic shell
- Compact Size: 21 mm × 21 mm × 17 mm — fits easily into tight enclosures
- Quantity: 1 piece per order
Ideal Applications
- AM/FM radio tuning circuits
- Medium and short wave radio receivers
- Crystal (ore) radio construction
- DIY and maker radio projects
- Electronics repair and prototyping
Specifications at a Glance
| Parameter | Value |
|---|---|
| Model | CBM-443BF |
| AM Capacitance | ~4 × 270PF (dual gang) |
| FM Capacitance | ~2 × 20PF (dual gang) |
| Dielectric Type | Thin Film (PVC) |
| Mounting Nut | M2.5 |
| Housing Size | 21 × 21 × 17 mm |
| Material | Plastic |
| Country of Origin | Made in China |
Notes
- Please allow ±1–2 mm tolerance due to manual measurement.
- Actual color may vary slightly from photos due to monitor calibration differences.
- The 2 × 20PF FM group is usable only in conjunction with the 2 × 270PF AM group.
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Further Reading
For guidance on electrical component safety and best practices for DIY electronics projects, visit the U.S. Consumer Product Safety Commission (CPSC). For electronics and RF standards, explore resources at NIST.gov.
Frequently Asked Questions
Q: What is the CBM-443BF dual variable capacitor used for?
A: The CBM-443BF is a thin film dual variable capacitor primarily used in AM/FM radio tuning circuits, medium and short wave radio receivers, and crystal (ore) radio builds. It provides smooth, precise capacitance adjustment for frequency selection in DIY and repair radio projects.
Q: Can the FM (20PF) section be used independently?
A: No — the 2 × 20PF FM dual variable capacitor group is designed to work in conjunction with the 2 × 270PF AM group. Both sections share the same mechanical assembly and must be used together within the same circuit.
Q: What mounting hardware does the CBM-443BF use?
A: This variable capacitor uses an M2.5 mounting nut, which is a standard size easily found at most electronics and hardware suppliers. The compact 21 × 21 × 17 mm plastic housing makes it suitable for both panel-mount and breadboard enclosure installations.
Q: Is this capacitor suitable for a beginner radio-building project?
A: Yes! The CBM-443BF is a popular choice for hobbyists and students building their first AM/FM or shortwave radio kit. Its dual-gang design simplifies the tuning circuit, and its compact plastic body makes it easy to handle and install in a wide variety of radio enclosure designs.
