Variable Capacitor
Variable capacitors, also known as tuning capacitors, allow you to adjust capacitance by mechanically changing the overlap between metal plates. We offer a range of high-quality variable capacitors for precise tuning in various applications, including radio receivers, oscillators, filters, and antenna tuners. Our capacitors are designed for durability, stability, and optimal performance.
Get Variable Capacitors with Affordable Prices
Get high-quality Variable Capacitors at Affordable Prices. Our precision-engineered capacitors offer exceptional performance and durability. Ideal for a wide range of applications including radio tuning, filter design, and oscillator circuits. Experience the perfect balance of quality and affordability.
adjustable capacitor
Adjustable capacitors are electronic components that allow you to change their capacitance value manually. This flexibility makes them invaluable in various applications, from radio tuning to frequency filtering.
vacuum variable capacitor
We supply high-precision Vacuum Variable Capacitors (VVCs) for demanding applications. Our VVCs offer exceptional stability, low loss, and wide tuning range. Ideal for critical RF and microwave systems, such as satellite communications, radar, and test equipment. We provide customization options to meet specific requirements, ensuring optimal performance in your designs.
air variable capacitor
As a leading electronic component manufacturer, we offer a range of high-quality air variable capacitors. These capacitors utilize air as the dielectric, ensuring excellent stability, low loss, and precise tuning. Ideal for applications demanding superior performance, such as radio frequency tuning, filter design, and test equipment.
air spaced variable capacitor
We supply high-quality air variable capacitors. Our air-spaced capacitors offer exceptional stability and low loss due to the absence of a solid dielectric. Ideal for critical applications such as RF tuning, filter design, and test equipment. Experience the precision and reliability of our air-spaced variable capacitors.
antenna tuning capacitor
As an electronic component manufacturer, we provide high-quality antenna tuning capacitors designed to optimize antenna performance. Our capacitors offer precise tuning capabilities, ensuring optimal signal reception and transmission. We supply a wide range of tuning capacitors to meet diverse needs, from small-scale applications to large-scale installations.
ceramic variable capacitor
As an electronic component manufacturer, we provide a wide range of ceramic capacitors variable. These high-performance components offer precise capacitance tuning and are ideal for applications like radio frequency tuning, filter design, and oscillator circuits. Our ceramic variable capacitors are known for their stability, reliability, and compact size.
crystal radio variable capacitor
As a leading electronic component manufacturer, we provide variable tuning capacitors for crystal radio, tailored for optimal performance in crystal radio receivers. Our capacitors offer precise tuning, durability, and sensitivity, ensuring clear and crisp audio reception. Trust our expertise to enhance your crystal radio experience.
dual ganged variable capacitor
We provide Dual Ganged Variable Capacitors tailored for precise tuning in various applications. These components feature two mechanically linked tuning sections, allowing for simultaneous adjustment of two circuits. Our dual ganged capacitors offer exceptional stability, low leakage current, and a wide capacitance range, ensuring optimal performance in your electronic designs.
electronic variable capacitor
As a leading electronic component manufacturer, we provide a wide range of high-quality variable capacitors. Our variable capacitors offer precise tuning capabilities and are ideal for various applications such as radio frequency tuning, filter design, and oscillator circuits. We supply components that meet stringent quality standards and deliver reliable performance.
high power variable capacitor
We supply high-power variable capacitors designed to handle demanding applications. Our capacitors offer exceptional performance, high power handling capabilities, and robust construction. Whether you need custom solutions or standard products, we provide the ideal variable capacitors to meet your specific requirements.
mica variable capacitor
As a leading electronic component manufacturer, we provide a wide range of Mica Variable Capacitors. These reliable components offer exceptional stability, low loss, and high Q factors. Ideal for applications requiring precise frequency tuning, such as radio receivers, filters, and oscillators.
plastic variable capacitor
We supply high-quality plastic variable capacitors, designed to meet the demands of modern electronics. These capacitors offer a wide tuning range, low loss, and excellent stability. Ideal for applications like radio receivers, filters, and oscillators, our plastic variable capacitors deliver reliable performance at competitive prices.
poly variable capacitor
We supply high-quality Polystyrene Variable Capacitors, ideal for applications demanding exceptional stability and low loss. Our capacitors feature precision construction, tight tolerance, and excellent temperature stability. Perfect for critical circuits in RF, audio, and instrumentation applications.
poly variable capacitor
We supply high-quality Polystyrene Variable Capacitors, ideal for applications demanding exceptional stability and low loss. Our capacitors feature precision construction, tight tolerance, and excellent temperature stability. Perfect for critical circuits in RF, audio, and instrumentation applications.
rotary variable capacitor
Rotary Variable Capacitors are designed for precise capacitance adjustment. By rotating a shaft, you can vary the overlap between the stator and rotor plates, thereby controlling the capacitance value. Our rotary variable capacitors are ideal for applications requiring fine-tuning, such as radio receivers, oscillators, and filter circuits.
split stator variable capacitor
We offer Split Stator Variable Capacitors, a unique design where the stator is divided into sections, allowing for greater precision and stability in capacitance adjustment. This configuration is ideal for critical applications requiring fine-tuning and minimal drift. Our split stator capacitors are built to the highest standards, ensuring optimal performance and reliability.
1000 pf variable capacitor
We supply high-quality 1000pF variable capacitors, ideal for fine-tuning circuits and applications requiring precise capacitance adjustment. Our capacitors offer excellent stability, low loss, and a wide tuning range. Whether you need them for radio frequency tuning, filter design, or oscillator circuits, we have the right solution for your needs.
Why Choose Our Variable Capacitors
Precision Engineering:
Our variable capacitors are meticulously engineered to deliver exceptional accuracy and repeatability. The precision-machined components and strict quality control ensure consistent performance, even under demanding conditions.
Durable Construction:
Built to last, our variable capacitors are constructed using high-quality materials and robust manufacturing techniques. They are designed to withstand harsh environments and prolonged use, ensuring reliability and longevity.
Superior Performance:
We prioritize performance in every aspect. Our capacitors offer low loss, high Q-factor, and wide tuning range. This translates to optimal circuit performance and reduced signal degradation.
Customizable Solutions:
We understand that every application is unique. That’s why we offer customizable solutions to meet your specific requirements. From custom capacitance ranges to specialized mounting options, we can tailor our capacitors to your exact needs.
Variable Capacitor FAQs
What is a variable capacitor?
A variable capacitor, also tuning capacitor, is a type of capacitor that allows you to adjust its capacitance value.
This is achieved by mechanically changing the overlap between two sets of metal plates (rotors and stators). This makes it a versatile component used in various electronic circuits, including radio receivers, oscillators, filters, and antenna tuners.
how do variable capacitors work?
Variable capacitors work by changing the amount of overlap between two sets of metal plates. One set of plates is fixed, while the other set is connected to a shaft that can be rotated.
As the shaft is rotated, the overlapping area between the plates changes, which directly affects the capacitance.
Basic Structure: A variable capacitor consists of two sets of metal plates:
- Rotor plates: These plates are connected to a shaft and can be rotated.
- Stator plates: These plates are fixed in position.
Changing Capacitance: When the rotor plates are rotated:
- Increased overlap: More of the rotor plates overlap with the stator plates, increasing the capacitance.
- Decreased overlap: Less of the rotor plates overlap with the stator plates, decreasing the capacitance.
This mechanical adjustment of plate overlap allows for precise control over the capacitance value, making variable capacitors essential components in various electronic circuits.
What is a variable capacitor used for?
Variable capacitors are primarily used to adjust the capacitance value in electronic circuits. This allows for tuning and fine-tuning of various parameters, such as frequency, resonance, and impedance.
Here are some of the most common applications:
- Radio Tuning: Variable capacitors are used to adjust the resonant frequency of a circuit, allowing you to tune in to different radio stations.
- Oscillators: They can be used to adjust the frequency of oscillation in electronic circuits.
- Filters: Variable capacitors can be used to adjust the cutoff frequency or bandwidth of filters.
- Antenna Tuning: They can be used to match the impedance of an antenna to a receiver or transmitter.
- Test Equipment: Variable capacitors are often used in test equipment for calibration and measurement purposes.
In essence, variable capacitors provide a flexible way to adjust the behavior of electronic circuits, making them essential components in many devices.
fixed vs variable capacitors
Fixed Capacitors
Fixed capacitors have a fixed capacitance value that cannot be changed after manufacturing. They are used in a wide range of electronic circuits, from simple filters to complex power supplies.
Variable Capacitors
Variable capacitors, on the other hand, allow you to adjust their capacitance value by mechanically changing the overlap between two sets of metal plates. This makes them useful in circuits where precise tuning is required, such as radio receivers and oscillators.
Key Differences:
| Feature | Fixed Capacitor | Variable Capacitor |
|---|---|---|
| Capacitance | Fixed value | Adjustable value |
| Physical Structure | Typically smaller and simpler | Larger and more complex, with a rotating mechanism |
| Common Applications | Filters, power supplies, timing circuits | Radio tuning, oscillators, filters |
In essence, fixed capacitors provide a static value for a circuit, while variable capacitors offer dynamic control over capacitance.
how to connect variable capacitor?
Connecting a Variable Capacitor: A Step-by-Step Guide
Understanding the Terminals:
Before connecting a variable capacitor, it’s essential to identify its terminals. Typically, a variable capacitor has two terminals:
- Rotor Terminal: This terminal is connected to the rotating plates.
- Stator Terminal: This terminal is connected to the fixed plates.
Basic Connection:
- Identify the Terminals: Look for the two terminals on the capacitor. They might be labeled or easily identifiable by their position.
- Connect the Rotor Terminal: This terminal is often connected to one side of the circuit, such as the input or output of an amplifier or oscillator.
- Connect the Stator Terminal: This terminal is usually connected to the ground or common point of the circuit.
Visual Guide:
Specific Applications:
The exact connection method will depend on the specific circuit you’re building. Here are some common applications:
- Radio Receivers: The variable capacitor is often connected in parallel with an inductor to form a resonant circuit. By tuning the capacitor, you can adjust the resonant frequency of the circuit, allowing you to select different radio frequencies.
- Oscillators: In oscillator circuits, the variable capacitor can be used to adjust the oscillation frequency.
- Filters: Variable capacitors can be used in filters to adjust the cutoff frequency or bandwidth.
Important Considerations:
- Capacitance Range: Ensure that the capacitance range of the variable capacitor is suitable for your application.
- Voltage Rating: The capacitor must be rated for the voltage levels in your circuit.
- Physical Size and Mounting: Choose a capacitor that fits your circuit’s physical constraints and consider the mounting options.
- Shielding: If necessary, shield the capacitor to prevent electromagnetic interference.
By following these guidelines and considering the specific requirements of your circuit, you can effectively connect a variable capacitor to achieve the desired tuning and frequency response.
how to make a variable capacitor?
Building Your Own Variable Capacitor: A DIY Guide
Disclaimer: While it’s possible to build a variable capacitor at home, it requires precision and specific materials. For most applications, purchasing a commercial variable capacitor is often a more practical and reliable solution.
If you’re still keen on building your own, here’s a basic approach:
Materials Needed:
- Metal Plates: Aluminum or copper sheets can be used.
- Insulator: A non-conductive material like plastic or ceramic.
- Shaft: A metal rod or tube to rotate the plates.
- Bearings: To ensure smooth rotation of the shaft.
- Screws, nuts, and washers: For assembly.
- Soldering Iron and Solder: For electrical connections.
- Wire: For connecting the capacitor to your circuit.
Steps to make variable capacitors:
- Cut the Plates: Cut the metal sheets into desired shapes and sizes. The size and number of plates will determine the capacitance range.
- Assemble the Stator: Mount the fixed plates (stators) onto an insulating base. Ensure they are spaced apart and parallel to each other.
- Assemble the Rotor: Mount the rotating plates (rotors) to the shaft. Ensure they can rotate freely without touching the stators.
- Insulation: Use the insulator to separate the rotor and stator plates to prevent short circuits.
- Mounting: Secure the rotor and stator assembly to a suitable base, allowing for smooth rotation of the shaft.
- Connect the Terminals: Attach wires to the rotor and stator terminals. You can use solder or other suitable methods to make the connections.
- Enclose: Consider enclosing the capacitor in a protective case to prevent damage and interference.
Key Considerations:
- Plate Spacing: The distance between the plates affects the capacitance. Smaller spacing leads to higher capacitance.
- Plate Overlap: The overlapping area of the rotor and stator plates determines the capacitance.
- Mechanical Precision: The precision of the mechanical assembly will influence the capacitor’s performance.
- Shielding: Consider shielding the capacitor to minimize interference from external electromagnetic fields.
Remember: Building a variable capacitor requires careful planning, precise measurements, and skilled craftsmanship. It’s often more practical to purchase a commercial variable capacitor, especially for critical applications.
how to measure variable capacitor?
Measuring a Variable Capacitor: A Step-by-Step Guide
Measuring a variable capacitor isn’t as straightforward as a fixed capacitor. This is because its capacitance changes as you rotate its shaft. You’ll need a device that can measure capacitance accurately and quickly.
Tools Required:
- LCR Meter: This is the most accurate tool for measuring capacitance. It can measure a wide range of capacitance values, including those of variable capacitors.
- Capacitance Meter: A more basic tool, but still effective for many applications.
- Oscilloscope and Function Generator: This combination can be used to measure capacitance indirectly by observing the frequency response of a circuit with the capacitor.
Measurement Procedure:
- Connect the Capacitor: Connect the leads of the LCR meter or capacitance meter to the terminals of the variable capacitor.
- Rotate the Shaft: Slowly rotate the shaft of the variable capacitor, taking measurements at different positions.
- Record the Readings: Note down the capacitance value for each position of the shaft.
- Plot a Graph: Plot the capacitance values against the shaft angle to visualize the capacitor’s capacitance range and linearity.
Additional Tips:
- Calibrate Your Meter: Ensure your meter is calibrated to provide accurate readings.
- Environmental Factors: Temperature and humidity can affect the capacitance of a capacitor. Consider these factors when taking measurements.
- Frequency Dependence: Some capacitors, especially those with high capacitance values, may exhibit frequency-dependent capacitance. If you’re measuring at high frequencies, be aware of this effect.
- Inductance: Variable capacitors can have a small amount of inductance, particularly at higher frequencies. This can affect the measurement, so consider using a low-frequency measurement technique if necessary.
Indirect Measurement Using an Oscilloscope and Function Generator:
- Build a Circuit: Construct a simple circuit with the variable capacitor and a known inductor or resistor.
- Apply a Signal: Apply a sinusoidal signal from the function generator to the circuit.
- Observe the Output: Use the oscilloscope to observe the output waveform.
- Measure Frequency: Measure the frequency of the output signal for different positions of the capacitor’s shaft.
- Calculate Capacitance: Use the known values of the inductor or resistor and the measured frequency to calculate the capacitance using appropriate formulas.
By following these steps and using the right tools, you can accurately measure the capacitance of a variable capacitor at different settings.
how to wire a variable capacitor？
How to Wire a Variable Capacitor
Understanding the Basics
A variable capacitor typically has two terminals:
- Rotor Terminal: Connected to the rotating plates.
- Stator Terminal: Connected to the fixed plates.
Basic Wiring:
- Identify the Terminals: Look for the two terminals on the capacitor. They might be labeled or easily identifiable by their position.
- Connect the Rotor Terminal: This terminal is often connected to one side of the circuit, such as the input or output of an amplifier or oscillator.
- Connect the Stator Terminal: This terminal is usually connected to the ground or common point of the circuit.
Visual Guide:
Specific Applications:
The exact connection method will depend on the specific circuit you’re building. Here are some common applications:
- Radio Receivers: The variable capacitor is often connected in parallel with an inductor to form a resonant circuit. By tuning the capacitor, you can adjust the resonant frequency of the circuit, allowing you to select different radio frequencies.
- Oscillators: In oscillator circuits, the variable capacitor can be used to adjust the oscillation frequency.
- Filters: Variable capacitors can be used in filters to adjust the cutoff frequency or bandwidth.
Important Considerations:
- Capacitance Range: Ensure that the capacitance range of the variable capacitor is suitable for your application.
- Voltage Rating: The capacitor must be rated for the voltage levels in your circuit.
- Physical Size and Mounting: Choose a capacitor that fits your circuit’s physical constraints and consider the mounting options.
- Shielding: If necessary, shield the capacitor to prevent electromagnetic interference.
Additional Tips:
- Soldering: Use a low-temperature soldering iron to avoid damaging the capacitor.
- Wiring: Use high-quality wire to minimize signal loss and interference.
- Grounding: Proper grounding is crucial for optimal performance and to reduce noise.
By following these guidelines and considering the specific requirements of your circuit, you can effectively wire a variable capacitor to achieve the desired tuning and frequency response.
