CBM-443BF AM/FM Dual Variable Capacitor 270PF+20PF Radio

CBM-443BF Dual Variable Capacitor for AM/FM Radio Tuning Circuits

The CBM-443BF Thin Film Variable Capacitor is a precision electronic component designed for use in AM/FM radio tuning circuits. Featuring a 2×270PF dual variable capacitance for AM reception and a 2×20PF dual variable capacitor group for FM reception, this compact unit also includes 4 fine-tuning capacitors — making it a versatile solution for hobbyists, electronics enthusiasts, and DIY radio builders alike.

Made in Mainland China.

Key Features

• Model: CBM-443BF
• AM Section: 2×270PF dual variable capacitance (4×270PF total)
• FM Section: 2×20PF dual variable capacitance
• Fine Tuning: 4 built-in fine-tuning capacitors
• Plastic Shell Dimensions: 21 × 21 × 17 mm
• Mounting Nut: M2.5
• Material: ABS plastic shell with PVC variable capacitor film
• Quantity: 1 piece

Applications

• Medium and short wave (AM) radio circuits
• FM radio tuning circuits
• Crystal/ore radio receiver builds
• DIY electronics and radio engineering projects

What's Included

• 1 × CBM-443BF Dual Variable Capacitor (AM+FM)

Important Notes

• Please allow ±1–2 mm tolerance due to manual measurement.
• Colors may appear slightly different on screen due to monitor calibration differences.
• The 2×20PF FM group can only be used in conjunction with the 2×270PF AM group.

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Frequently Asked Questions

Q: What is the CBM-443BF variable capacitor used for?

A: The CBM-443BF dual variable capacitor is primarily used in AM/FM radio tuning circuits, including medium and short wave radios as well as crystal (ore) radio receiver builds. Its dual-gang design allows simultaneous tuning of two resonant circuits for improved selectivity.

Q: Can the FM (2×20PF) section be used independently?

A: No — the 2×20PF FM dual variable capacitor group is designed to work in combination with the 2×270PF AM group. It cannot be operated independently from the main capacitor assembly.

Q: What mounting hardware does the CBM-443BF use?

A: This variable capacitor uses an M2.5 mounting nut for secure installation onto your radio chassis or PCB project enclosure.

Q: What are the physical dimensions of this capacitor?

A: The ABS plastic shell measures approximately 21 × 21 × 17 mm. Please allow ±1–2 mm tolerance due to manual measurement.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.