jbcapacitors blog

A trimmer capacitor is a variable capacitor used for initial calibration and recalibration of equipment. It is commonly mounted directly on a PCB and accessed only by professional repairmen, not the end-user.

Characteristics
Voltage rating, capacitance range, polarity.
Trimmer capacitors can be rated for voltages up to 300 volts, although voltage ratings of up to 100 volts are much more common. Since trim caps are variable capacitors, they come in a capacitance range rather than a
single capacitance value. The minimum capacitance is usually between 0.5 pF and 10 pF, while the maximum capacitance is usually between 1 pF and 120 pF. The actual capacitance value can be varied between the
minimum and maximum capacitance values for a given trimmer capacitor, but it can never be set to zero. It is worth noting that trimmer capacitors are not polarized.

Tolerances and accuracy
Trimmer capacitors do not boast a good capacitance value tolerance. Sometimes, the tolerances can be as high as -0 to +100%. This means that a trimmer capacitor can have a maximum capacitance two times larger
than nominal. However, bad tolerances do not pose a great problem to engineers because trimmer capacitors are variable. Even if the maximum value is different between individual capacitors, they can still be set by turning the screwdriver a certain angle. Accuracy depends mostly on the operator, as he can choose to spend more time in order to set the capacitor to a desired value. Often, trimmer capacitors are set by robots instead of human operators, and they can achieve much better precision. In order to achieve a better accuracy, it is advised to use a non-metallic tool, since metal screwdrivers will introduce a source of capacitance that will vary the capacitance value when the tool is moved away from the capacitor.

Construction and properties of trimmer capacitors
There are two types of trimmer capacitors: air trimmer capacitor and ceramic trimmer capacitor. These two types use different materials as the dielectric. Both types use rotating action to change the capacitance value.
The construction of trimmer capacitors is similar to the construction of their larger variant, the variable capacitor. Trimmer capacitors can be made of semi-circular metal plates. One is fixed, while the other can be rotated using a screwdriver. The user changes the capacitance by rotating the shaft and increasing or reducing the amount of overlap between the two plates. Gear mechanisms may be used to improve the precision by allowing multiple turns between the lowest and highest settings.

Another way to make a trimmer capacitor is to place a metallic screw in a non-conductive threaded cylinder. The screw represents one electrode, while the other is located at the base of the cylinder. By rotating the screw, the distance between the two plates is varied which results in a change of capacitance. This construction is used in RF and microwave applications. 

Ceramic Trimmer capacitor is a semi-fixed adjustable capacitor, and its electrostatic capacity can be changed freely.

The working principle of JKA trimmer capacitor: Change the overlapping area of electrodes. One of the electrodes is fixed to sandwich the dielectric, and the other is made as a variable electrode. The change in the overlapping area of the two electrodes (the area of the opposite electrode) can change the electrostatic capacitance.

jb Capacitors Company’JKA series: surface mount ceramic trimmer capacitors with mini size, five kinds of capacitance values, different color is easily identified.

Super Capacitors is also known as ultra-capacitor or double-layer electrolytic capacitor. They are effective to recharge quickly. Often be used in solar power, battery back-up, battery, flash-light applications, etc. Now also have made critical inroads into electric powertrains.

We offer several types of super capacitors, including Radial, Snap-in, Screw, Coin, and Combined Type. High quality and short delivery time.

Super Capacitors List
JGA - 5.5V Standard Coin Type Super Capacitors
JGM - 5.5V 7.5V Combined Type Super Capacitors
JGY - 5V 7.5V Combined Type Super Capacitors
JGZ - 2.7V 3V Low ESR Radial Snap in Screw Type Super Capacitors

Welcome to contact if you are interested with our capacitors. Our sales team is willing to recommend our products and prepare good prices for you.

jb has wide product range of Radial Aluminum Electrolytic Capacitor. From Load life of 1000H to 10000H. It is meant to meet the demands of the customers. JRG series has the longest load life Radial Aluminum Electrolytic Capacitor. It can reach to 10000 hours.

Not only the size on the datasheet, but also we can provide the customized item for special project. This series can be used on different application including Audio products, consumer electronic, and so on.

Below is its features, please take look. Or contact with our sales team for more information.

Load life of 10000 hours at 105°C
High ripple current
Miniature Series
RoHS Directive Compliant

jb has wide product range can cross to different capacitors brand, our JFQD is  Double Sided Box Type Met Polypropylene Film Capacitor. It can be crossed to Vishay MKP383, Wima MKP 10. Kemet R76 series. Its capacitance value is from 0.001 to 0.068uF with high precision of capacitance. And, the rated voltage range is from 630VDC to 2000VDC. Moreover, the tolerance can reach +/-5% and +/-10%. Its application includes high voltage, high frequency and pulse circuit.

Features:
Double sided metallized polypropylene structure
Low loss and small inherent temperature rise
Excellent active and passive flame resistant abilities.
Negative temperature coefficient of capacitance

jb Capacitor Company has expanded product line time by time. PSS and PSR are kind of our new series. Please noted that we can offer fast lead time and high quality as well. To increase our market share, we release these series. Also, we hope that they can meet the demands of customers. Polymer capacitors can offer high capacitance in small size, long life, high reliability. Below is their features.For more information about polymer’s price, please contact our sales team.

PSS - 2000H at 105°C Standard Low ESR Radial Polymer Aluminum Solid Electrolytic Capacitors Features:
Standard Series. Load life of 2000 hours at 105°C.
Large permissible ripple current
Low ESR at high frequency range
Comply with the RoHS directive.

PSR - 2000H at 105°C Super Low ESR Radial Polymer Aluminum Solid Electrolytic Capacitors Features:
Low ESR Series. Load life of 2000 hours at 105°C.
Large permissible ripple current
Super Low ESR at high frequency range
Comply with the RoHS directive

jb Conductive Polymer Aluminum Solid Electrolytic Capacitors with Chip SMD type and Radial Lead type.

Due to different characteristics, Polymer Aluminum Solid Electrolytic Capacitors can be divided to Standard, Ultra-low ESR, Higher Capacitance, Long Life Assurance, High Voltage/Long Life Assurance, High Voltage/High Reliability series. 

Aluminum polymer electrolytic capacitors are the latest evolutionary step in improving the properties of aluminum electrolytic capacitors to make them more like a film capacitor.

Applicable to DC/DC converters and AC/DC converters, communication power supply, set-top boxes, router, TV, voltage regulator, mobile phone adapter (mobile phone charger), computer motherboard, graphics card, power supplies, CPU’s, Decoupling circuits and LCD Monitors.
Load life of 2000 hours at 105°C.
Large permissible ripple current
Low ESR at high frequency range
Comply with the RoHS directive.
SMD, lead free reflow soldering condition at 250℃ peak correspondence

You can mail us your exact demand and let us check the most suitable products for you
Website:https://www.jbcapacitors.com/

jb has extensive experience on the production of Film capacitors, and it has many film capacitors series including High Voltage. The JFP and JFQ, they are both high voltage capacitors. JFQ is High Voltage Box Type Metallized Polypropylene Film Capacitor, the other hand, JFP is High Voltage Dipped Type Metallized Polypropylene Film Capacitor. They have slightly different.

For film capacitors, jb can offer fast lead time, high quality with competitive price. And, for most of our capacitors, we can customized for customer.
Please check below is their features. For further information, please contact to our sales team via our official email address.

JFP - High Voltage MKP Features:
Extended foil, flame retardant epoxy coated.
Coated with flame retardative epoxy resin which provides from humidity and mechanical damage.
Temperature coefficient is negative and variety linear over the operation temperature.

JFQ - High Voltage Box Type MKP Features:
Metallized structure, widely used in high voltage, high frequency and pulse circuit.
Negative temperature coefficient of capacitance.
Excellent active and passive flame resistant abilities.
Low loss and small inherent temperature rise.

welcome to visit our Youtube video:
jb JFL Metallized Polypropylene Film apacitor:https://youtu.be/k10XraBxvB4

Snap-in Aluminum Electrolytic Capacitor is one of the strong series in jb Capacitors Company. We have wide range of capacitance for our standard items. But, we can also customized for customers. To be easily mounted on PCB board, snap in E-cap has two pin or three pin snap- in terminals. About its feature, it has great ripple current capabilities with compact dimensions. Furthermore, it has outstanding load life. Its typical application has, inverters, converters, power supplies, UPS and so on.

There are different load life, operating Temperature for different series. Please check below is the table for each series. Below is only standard data, if you need any customized parameter, please contact with our sales team.

welcome to visit our Youtube video:
jb Snap in Type Aluminum Electrolytic Capacitors Factory:https://youtu.be/1yrwKo1VGCs