AM/FM Thin Film Variable Capacitor CBM-443BF | Radio Tuning
AM/FM Thin Film Variable Capacitor CBM-443BF | Radio Tuning
The CBM-443BF-1AB4 AM+FM Thin Film Variable Capacitor is a precision electronic component designed for radio tuning circuits. Whether you're building, repairing, or experimenting with AM/FM radio projects, this compact dual-gang variable capacitor delivers reliable performance in a durable plastic housing.
Key Specifications
- Model: CBM-443BF-1AB4
- Shell Size: 21 × 21 × 17 mm (plastic housing)
- AM Section: 4 × 270 pF (quad gang)
- FM Section: 2 × 20 pF (dual gang)
- Mounting Nut: M2.5
- Material: Plastic / PVC thin film construction
- Quantity: 1 piece
- Color Options: Available in 2 colors
Why Choose This Variable Capacitor?
This thin film variable capacitor is engineered for smooth, precise tuning across both AM and FM bands. Its compact 21 × 21 × 17 mm form factor makes it ideal for DIY radio builds, electronics repair, hobbyist projects, and educational circuits. The standard M2.5 mounting nut ensures easy, secure installation in a wide range of enclosures and PCB configurations.
Ideal Applications
- AM/FM radio receiver tuning circuits
- DIY radio construction and repair
- Electronics hobbyist and maker projects
- Educational electronics experiments
- Replacement for worn or damaged variable capacitors in vintage radios
Note: Item color displayed in photos may appear slightly different on your monitor, as monitor calibration varies.
For more information on electronic components and radio frequency circuits, visit the National Institute of Standards and Technology (NIST) Electronics Resources.
Frequently Asked Questions
Q: What is the CBM-443BF-1AB4 AM+FM thin film variable capacitor used for?
A: The CBM-443BF-1AB4 is a dual-band variable capacitor primarily used in AM and FM radio tuning circuits. It allows you to adjust capacitance to tune into different radio frequencies. It's a popular choice for DIY radio builders, electronics hobbyists, and repair technicians working on AM/FM receivers.
Q: What are the capacitance values for the AM and FM sections?
A: The AM section provides approximately 4 × 270 pF of capacitance, while the FM section offers approximately 2 × 20 pF. This dual-gang configuration makes it suitable for covering both AM and FM frequency bands within a single compact component.
Q: What mounting hardware does this variable capacitor use?
A: This capacitor uses a standard M2.5 mounting nut, making it easy to securely install in most DIY radio enclosures, breadboards, or PCB layouts. Its compact 21 × 21 × 17 mm plastic housing keeps your build neat and space-efficient.
Q: Is this variable capacitor compatible with vintage radio repairs?
A: Yes — the CBM-443BF-1AB4 is well-suited as a replacement component in vintage AM/FM radio restorations, provided the circuit design accommodates its capacitance range and physical dimensions. Always verify specifications match your existing circuit before installation.