Kingtronics Blog

Trimmer potentiometers and preset resistors are small variable resistors which are used in circuits for tuning and (re)calibration.

Types of Trimming Potentiometer

Several different versions of trimmer are available, using different mounting methods (through hole, smd) and adjusting orientations (top, side) as well as single and multi-turn variation.

1》Open, carbon track
2》Enclosed, side adjust
3》Enclosed, SMD

Single turn

Single turn trimmers/presets are very common and used where a resolution of one turn is sufficient. They are the most cost effective variable resistors available.

Multi turn

For higher adjustment resolutions, multi-turn Trimming Potentiometers are used. The amount of turns varies between roughly 5-25, but 5, 12 or 25 turns are quite common. They are often constructed using a worm-gear (rotary track) or (linear track) mechanism to achieve the high resolution. Because of their more complex construction and manufacturing, they are more costly than single turn preset resistors. The lead screw packages can have a higher power rating because of their increased surface area.

Trimming potentiometer symbols

The following IEC symbols are used for trimmers and preset resistors. Although this are the official symbols for occasionally adjusted resistors, the standard symbols for a potentiometer or rheostat are often used.

Kingtronics other trimming potentiometer ( RoHS compliant, ISO/SGS certified )
RKT-3006, RKT-3266, RKT-3296, RKT-3323, RKT-3329, RKT-3362, RKT-3386, RKT-3309, RKT-065, RKT-C3305, RKT-3540S, RKT-3590
 
Brief description:
Single Turn/ Phenolic/ Industrial
 
Detailed Description:
Standard Resistance Range  100Ω - 2MΩ 
Resistance Tolerance  ±30% 
Residual Resistance  Max 5% of Nominal Resistance, But under 30Ω 
Resistance Taper  Linear (B) 
Rated Power  0.1W 
Operating Voltage  50V Max 
Potational Life 
Max ±5% change in resistance after 100 unloaded rotations 
Load Life Max ±5% change in resistance after 3 hours loaded 
 
Rotational Angle  200° ± 20° 
Rotational Torque  30~350g.cm 
Stop-end Strength  500g.cm minimum

-- ISO 9001: 2008 manufacturer, 2 factories, ISO & UL & SGS certified.
-- Meet us at Electronica 2012, Booth No.: B6.437/5, 13-16 November ,2012, Munich, Germany.
-- Meet us at electronicAsia 2012，Booth No.: 5G-D12, 13-16 October 2012, in HK.

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