Trimmer potentiometers and their application
5 October 2005
Passive Components
Information from Avnet Kopp
The applications of trimmer potentiometers are roughly divided into the following two categories: voltage division adjustment - where a certain voltage is obtained from the ratio of the resistance; current adjustment - where a current value is determined from the magnitude of resistance.
Resistive elements are available in two types: carbon and cermet (ceramic-metal):
* With the carbon resistive element type, the long-term change of the resistance as a result of exposure to high temperature or humidity is rather great. However, since the resistance changes uniformly throughout the entire resistor, the ratio of the resistance (resistance setting stability, or RSS) barely changes. Therefore, this type is generally used for voltage division adjustment. However, when the total resistance change (fluctuation TR) is within the circuit tolerance, this type may also be used for current adjustment application.
* With the cermet resistive element type, the long-term change of the resistance as a result of exposure to high temperature or humidity is small. Therefore, this type is used both for voltage division adjustment and current adjustment.
Murata has available the PVZ3 Series carbon resistive element trimmer potentiometers and PVA3 Series cermet resistive element trimmer potentiometers. Environmental test graphs showing the change in resistance over time (1000 hrs) are available from the distributor to aid the design choice.
Further reading:
3,75 GHz RF inductor
RF Design
Passive Components
The ceramic chip wire wound inductor from Coilcraft features a DC resistance of 1 O, a DC current of 175 mA, and a self-resonant frequency of 3,75 GHz.
Read more...
Upgraded power inductor series
iCorp Technologies
Passive Components
Sunlord’s multiphase co-fired power inductor HTF-MP series has upgraded the single-phase HTF-H products in terms of integrated applications.
Read more...
Advanced high-voltage capacitors
RS South Africa
Passive Components
These new capacitor families from Panasonic are designed for surface-mount and radial lead applications, offering remarkable performance improvements that meet the evolving needs of industrial applications.
Read more...
Chip capacitors for high-voltage applications
RS South Africa
Passive Components
TDK Corporation has expanded its line of CeraLink capacitor series B58043 in the EIA 2220 footprint by adding two new
900 V types.
Read more...
Moulded inductors
Future Electronics
Passive Components
Abracon’s mini-moulded inductors bring all the advantages of their larger counterparts, including superior EMI shielding, high power density, and low core losses, despite their compact size.
Read more...
New components from KEMET available from TME
Passive Components
Available from KEMET, one of the largest suppliers of passive components, these new components consist of toroidal inductors (ferrites) and capacitors which boast high current performance.
Read more...
Miniature reed relay with 80 W rating
Passive Components
Pickering Electronics has introduced its latest high-power reed relay, Series 44, featuring an 80 W power rating, while stacking on a compact 0,25-inch pitch.
Read more...
The future of on-board charging
Future Electronics
Passive Components
Engineered to elevate charging performance, the selection of Vishay capacitors, resistors, and other passives redefine reliability and efficiency in on-board charging technology.
Read more...
Cooling on a chip
Passive Components
This all-silicon, solid-state active cooling chip by xMEMS is designed for thermal management applications for ultra-mobile devices and next-gen AI solutions.
Read more...
First 100 µF MLCC in 0603 packaging
RS South Africa
Passive Components
Murata is expanding its range of multilayer ceramic capacitors (MLCC) with the groundbreaking new GRM188C80E107M and GRM188R60E107M.
Read more...
printer friendly version