Kingtronics International Company

Dear valued customer,

Our Kingtronics website in Portuguese and Russian is available now. You can visit it via 
clicking below different language icons.Much appreciate if we can receive your suggestion, we will
keep improving it !

Below transistor and diode are our strong parts, pls contact  info@kingtronics.com if you 
need price, thank you!

Transistor BC847A/B/C SOT-23 T&R RoHS  
Transistor BC807-16/25/40 SOT-23 T&R RoHS   

0.5W BZX55C2V7 ~ 47V  DO-35 Bulk RoHS
0.5W BZV55C2V0 ~ 47V  mini melf  LL-34 T&R RoHS         

Switch diode BAV70 SOT-23 T&R RoHS
Switch diode BAV99 SOT-23 T&R RoHS     

Bridge DB107S DBS 50pcs/Tube RoHS
Bridge MB6S MBS 2500pcs/Reel RoHS 

Trimmers Basic:

In its most common form, a trimmer is simply a device containing a resistive element, and a wiper, or adjustable tap, contacting the element. The wiper can be mechanically moved to vary the amount of voltage or resistance in the circuit. The resistive element is usually laid out in linear or a circular configuration:

You know that Kingtronics specialize in manufacturing diode, bridge rectifier, capacitor and trimmer, right?

From now on, besides above 4 series, we have a new series--transistor. In order to promote it to the market aggressively, we put forward much more competitive price than these brands Diodes, Fairchild, NXP, ON Semi and STM....

Are you keen to save cost and profits increase? Pls feel free to contact or email me sales2@kingtronics.com

Dear valued customer,

How are you today ?

Thanks for your read receipt and inquiry on my last RKT-C3305 promotion. 　

Would you like to check our price for radial and SMD type tantalum capacitors ?

We produce and sell high quality capacitors under our own registered brand king & kt since 1990.

Here i list some common value for your reference, could you pls check and send me inquiry for these ? thank you

ISO, SGS and UL certified Manufacturer. Diode M7 (SMD 1N4007, SMA) DO-214AC T&R RoHS2. Monthly Output: 90KKpcs.

Datasheet: http://www.kingtronics.com/pdf/M7-diode.pdf

Applications: 
Alarm, automotive, communications, power meter, ballast construction...
Payment terminals, terminal block, automobile electronics, TV, cash registers...
Power supply, electricity meter, LED lighting, small household appliances, power adapter....

Cross Reference:

Kingtronics specializes in manufacturing trimming potentiometers, tantalum & ceramic capacitors, diode and bridge rectifiers.
We are a professional electronic components manufacturer with over 20-year history. Could you pls check below Kingtronics Strong Series Products?
---ISO 9001: 2008 manufacturer, 2 factories since 1990, ISO/UL/SGS certificates

1. QKT--Quartz Crystal
    QKT-HC49U, QKT-HC49S, QKT-HC49SMD
    http://www.kingtronics.com/pdf/Kingtronics-Crystals-list.pdf

2. RKT--Trimmer Potentiometer(Cross to Bourns,Murata,Tocos,Vishay, BI technology)
    3296 3006 3386 3266 3362 3329 3590S SMD C3305 3mm SMD trimmer (3303, Murata PVZ3A)
    http://www.kingtronics.com/pdf/Kingtronics-Potentiometer-part-list.pdf

3. MKT--Radial Multilayer Ceramic Capacitor, Lead, Through Hole;
　AKT--Axial Lead Multilayer Ceramic Capacitor
    0.01uF 50V X7R +/-10% P:5.08mm Bulk RoHS
   http://www.kingtronics.com/pdf/Kingtronics-ceramic-multilayer-capacitor-part-list.pdf 

4.TKT-- Dipped Tantalum Capacitors, Radial Type, Lead Space.
   1uF 35V +/-20% P: 2.54mm Bulk RoHS
   http://www.kingtronics.com/pdf/Kingtronics-tantalum-capacitor-part-list.pdf 

5. Diode and Bridge Rectifier
    Diode S1M, SM4007, RS1M, M7, LL4148, BZV55C,
    Bridge Rectifiers MB2S, MB6S, MB8S (S380), DB107S
    http://www.kingtronics.com/pdf/Kingtronics-diode-and-bridge- part-list.pdf

Example1: Flicker adjustment for LCD (Liquid - crystal display)
To adjust the reference voltage (VCOM) of LCD.
With inappropriate reference voltage, there will be flicker on LCD screen.
Use trimmer Potentiometers to adjust reference voltage for flicker restraining.

LCD has some flickers if the voltage is not suitable for LCD.
 

You can reduce the flickers when you adjust the voltage by using trimmer potentiometer.
 

Example2: Gain adjustment for Blu-ray, DVD, CD disc reading optical pick - up.

As record media Blu-ray, DVD and CD etc. usually be used, and we use optical pick - up for the data
reading and writing from disc. In an optical pick - up, there is a light - sensitive element to detect
reflected light from disc.And a trimmer potentiometer is used to adjust the sensitivity
of thislight - sensitive element.
 

Circuit example Playback system device (ex, DVD, CD, playback)

Example3: Sensitivity adjustment for sensor products.

There are all kinds of sensors around our life.

• Lights turn on automatically when human be detected.
• Smoke detector for fire preventing.
• Parking assist system for distance from car to wall.
• Product detection sensor in factory.
   

 For these sensors, trimmer Potentiometers are used for suitable sensitivity.
 

Principle of Trimmer Potentiomerets

A fixed resistor with a mechanism to change resistance construct a trimmer potentiometers. The principle is with the changing of resistive element length according a wiper sliding, the resistance will be changed. Use this method, with same sectional area, the resistance can be changed relative to resistive element length, and products can be manufactured in low cost.

            R: Resistance [Ω] 
            ρ: Resistivity [Ω/m] 
            L: Resistive element length [m] 
            S: Resistive element sectional area [m2]

• The position of contact point decide the length of resistive element.
  Resistance between No.1 and No.2 (R12) will become higher if contact point become closer to No.3.
• For easy introduction, we drew the resistive element like a rectangular solid. Actually, almost resistive element is round shape
  (U - shaped) .So the track of wiper is circle, and resistance is decide by the angle of wiper.
   

Change in resistance of Trimmer Potentiometers

There is the relationship between wiper position (angle) and resistance in below figure.

The output wave is besed on below conditions.
Resistive element is round shape (U - shaped) /Single - turn/No whirl - stop.

Construction
Single - turn, no whirl - stop typ    The relationship between wiper position　(angle) and resistance　

 
Feature of Trimmer Potentiometers

By using trimmer potentiometers, it is no problem to set surrounding circuit constant roughly.
Would you please use trimmer potentiometers if it is difficult to decided on a resistance value in your circuit. You can design your circuit roughly and quickly as the result.
　　

Trimmer potentiometer 3296, 3006, 3386, 3266, 3362, 3329, 3590S, 3540S, 065, SMD C3305...

(zastřihovač potenciometr; preset; trimmer potenziometro; тример-потенциометъра; подстроечный потенциометр; підлаштування потенціометр;)
 
We are one of the oldest factories for producing trimmer potentiometer in China since 1990, with mature technology.
Different from other potentiometer suppliers, our potentiometer quality is very good, got approval wiht  ISO & SGS certifications, RoHS Compliant.

We also can make equivalence for brands like Bourns, BI Technology, Tocos, Murata, Vishay, Copal, CTS... 
 
RKT-3006 3/4" (19 mm) Rectangular Trimming Potentiometer
RKT-3266 1/4" (6 mm) Square Trimming Potentiometer
RKT-3296 3/8" (9 mm) Square Trimming Potentiometer
RKT-3323 1/4" (6 mm) Square Trimming Potentiometer
RKT-3329 1/4" (6 mm) Round Trimming Potentiometer
RKT-3362 1/4" (6 mm) Square Trimming Potentiometer
RKT-3386 3/8" (9 mm) Square Trimming Potentiometer
RKT-3309 9 mm Through-Hole Cermet Consumer Trimming Potentiometer
RKT-3540S Precision Potentiometer (Multiturn)
RKT-3590 Precision Potentiometer (Multiturn)
RKT-C3305 Trimming Potentiometer-3mm SMD
RKT-065 Phenolic Consumer Trimming Potentiometer