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    3386X Search Results

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    3386X Price and Stock

    Bourns Inc 3386X-1-252LF

    TRIMMER 2.5KOHM 0.5W PC PIN SIDE
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 3386X-1-252LF Tube 1,980 1
    • 1 $1.58
    • 10 $1.269
    • 100 $1.0181
    • 1000 $0.81441
    • 10000 $0.69512
    		Buy Now
    Avnet Americas 3386X-1-252LF Tube 7 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.6916
    		Buy Now
    Newark 3386X-1-252LF Bulk 13 1
    • 1 $0.244
    • 10 $0.244
    • 100 $0.244
    • 1000 $0.244
    • 10000 $0.244
    		Buy Now
    Bristol Electronics 3386X-1-252LF 1,400
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Get Quote
    Master Electronics 3386X-1-252LF
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.832
    • 10000 $0.645
    		Buy Now

    Bourns Inc 3386X-1-473LF

    TRIMMER 47K OHM 0.5W PC PIN SIDE
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 3386X-1-473LF Tube 1,949 1
    • 1 $1.86
    • 10 $1.493
    • 100 $1.1977
    • 1000 $0.95814
    • 10000 $0.81778
    		Buy Now
    Mouser Electronics 3386X-1-473LF 1,990
    • 1 $1.8
    • 10 $1.29
    • 100 $1.07
    • 1000 $0.945
    • 10000 $0.774
    		Buy Now
    Newark 3386X-1-473LF Bulk 796 1
    • 1 $1.8
    • 10 $1.37
    • 100 $1.25
    • 1000 $1.02
    • 10000 $1.02
    		Buy Now
    Avnet Abacus 3386X-1-473LF 10 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Buy Now

    Bourns Inc 3386X-1-471LF

    TRIMMER 470 OHM 0.5W PC PIN SIDE
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 3386X-1-471LF Tube 1,645 1
    • 1 $1.86
    • 10 $1.493
    • 100 $1.1977
    • 1000 $0.95814
    • 10000 $0.81778
    		Buy Now
    Mouser Electronics 3386X-1-471LF 6,765
    • 1 $1.61
    • 10 $1.22
    • 100 $1.18
    • 1000 $0.655
    • 10000 $0.642
    		Buy Now

    Bourns Inc 3386X-1-103TLF

    TRIMMER 10K OHM 0.5W PC PIN SIDE
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 3386X-1-103TLF Tube 622 1
    • 1 $2.68
    • 10 $2.157
    • 100 $1.7292
    • 1000 $1.3822
    • 10000 $1.17888
    		Buy Now
    Avnet Abacus 3386X-1-103TLF 10 Weeks 200
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    		Buy Now

    Bourns Inc 3386X-1-501LF

    TRIMMER 500 OHM 0.5W PC PIN SIDE
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 3386X-1-501LF Tube 530 1
    • 1 $1.86
    • 10 $1.493
    • 100 $1.1977
    • 1000 $0.95814
    • 10000 $0.81778
    		Buy Now
    Newark 3386X-1-501LF Bulk 198 1
    • 1 $0.946
    • 10 $0.867
    • 100 $0.867
    • 1000 $0.8
    • 10000 $0.8
    		Buy Now
    TTI 3386X-1-501LF Tube 400 10
    • 1 -
    • 10 $1.27
    • 100 $1.04
    • 1000 $0.88
    • 10000 $0.88
    		Buy Now
    TME 3386X-1-501LF 1
    • 1 $1.99
    • 10 $1.79
    • 100 $0.97
    • 1000 $0.97
    • 10000 $0.97
    		Get Quote
    Find more 3386X price and stock on Findchips.com

    3386X Datasheets (156)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    3386X-1-100 Bourns Single-Turn Trimmer Potentiometers 3/8 SQ 10OHMS 10% 0.5WATTS Original PDF
    3386X-1-100LF Bourns TRIMMER - 3/8" SQ ST CERMET Original PDF
    3386X-1-101 Bourns Trimmers - Selection Guide Original PDF
    3386X-1-101 Bourns POT 100 OHM 3/8 SQ CERM SL ST Original PDF
    3386X-1-101 Bourns Over 600 obsolete distributor catalogs now available on the Datasheet Archive - Trimmer, Cermet, Multi Turn, .5 Watt, 10%, 100 Scan PDF
    3386X-1-101LF Bourns Trimmer; Series:3386; Track Resistance:100ohm; Resistance Tolerance: 10%; Power Rating:0.5W; Operating Temperature Range:-55 C to ? C; Resistor Element Material:Cermet; Temperature Coefficient:100 ppm RoHS Compliant: Yes Original PDF
    3386X-1-101T Bourns TRIMMER - 3/8" SQ ST CERMET Original PDF
    3386X-1-101TLF Bourns TRIMMER - 3/8" SQ ST CERMET Original PDF
    3386X-1-102 Bourns Trimmers - Selection Guide Original PDF
    3386X-1-102 Bourns Cermet Potentiometer; Resistance Max:1kohm; Resistance Min:10ohm; Resistance Tolerance:+/- 10 %; Power Rating:0.5W; Voltage Rating:500V; Series:3386; Temperature Coefficient:+/-100 ppm; Adjustment Type:Trimmer Original PDF
    3386X-1-102 Bourns Over 600 obsolete distributor catalogs now available on the Datasheet Archive - Trimmer, Cermet, Multi Turn, .5 Watt, 10%, 1K Scan PDF
    3386X-1-102LF Bourns Trimmer; Resistance Max:1kohm; Resistance Min:10ohm; Resistance Tolerance:+/- 10 %; Power Rating:0.5W; Voltage Rating:500V; Series:3386; Temperature Coefficient:+/-100 ppm; Adjustment Type:Trimmer; Leaded Process Compatible:Yes Original PDF
    3386X-1-102T Bourns Single-Turn Trimmer Potentiometers 3/8 SQ 1KOHMS 10% 0.5WATTS Original PDF
    3386X-1-102TLF Bourns TRIMMER - 3/8" SQ ST CERMET Original PDF
    3386X-1-103 Bourns Trimmers - Selection Guide Original PDF
    3386X-1-103 Bourns POT 10K OHM 3/8 SQ CERM SL ST Original PDF
    3386X-1-103 Bourns Over 600 obsolete distributor catalogs now available on the Datasheet Archive - Trimmer, Cermet, Multi Turn, .5 Watt, 10%, 10K Scan PDF
    3386X-1-103LF Bourns Trimmer; Resistance Max:10kohm; Resistance Min:100ohm; Resistance Tolerance:+/- 10 %; Power Rating:0.5W; Voltage Rating:500V; Series:3386; Temperature Coefficient:+/-100 ppm; Adjustment Type:Side; Leaded Process Compatible:Yes Original PDF
    3386X-1-103T Bourns Single-Turn Trimmer Potentiometers 3/8 SQ 10KOHMS 10% 0.5WATTS Original PDF
    3386X-1-103TLF Bourns POT 10K OHM 3/8 SQ CERM SL ST Original PDF
    ...

    3386X Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    trimmer 3386

    Abstract: potentiometer trimmers 3386 trimmer potentiometer 3386P trimmer POTENTIOMETER 3386 3386 potentiometer rotary potentiometer switch 3386P 3386W
    Text: 3386 Trimmer Potentiometers, Potentiometers,Trimmer Potentiometer, Cemet. Potentiometer, Rotary Carbon Potentiometer with Pull-Push Switch, Carbo • • 3386 9mm Square Single-Turn Trimmer Potentiometers Vatronics makes 3386X,3386W,3386P,3386U Series. Electrical


    Original     		PDF 3386X 3386P 3386U 100--2M· 500Vdc· range-55 100ppm/· 250ppm/· 30min, 30min trimmer 3386 potentiometer trimmers 3386 trimmer potentiometer 3386P trimmer POTENTIOMETER 3386 3386 potentiometer rotary potentiometer switch 3386W

    pt1017

    Abstract: mt 1389 vde converter siemens modules GR 60 48V 120 A SMD Code 12W SOT-23 600w 12V 230V Inverter schematic mw 137 600g PT1000 NTC TEMPERATURE CHART smd 4pk EPL1902S2C 67127490
    Text: Section Reference Index Connectors, Cable Assemblies, IC Sockets. . . . . . . . . . . . . . . . 12-132 Semiconductors, ICs, Transistors, Diodes, Rectifiers . . . 133-239 3.6 EC SI Crystals, Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240-253


    Original     		PDF El00-KIT-ND J200-KIT-ND 1600-KIT-ND 1601-KIT-ND 1602-KIT-ND 1603-KIT-ND 1604-KIT-ND 923000-I-ND 10514-ND 10522-ND pt1017 mt 1389 vde converter siemens modules GR 60 48V 120 A SMD Code 12W SOT-23 600w 12V 230V Inverter schematic mw 137 600g PT1000 NTC TEMPERATURE CHART smd 4pk EPL1902S2C 67127490

    bourns trimpot 3006P

    Abstract: trimpot 3006P 3386F trimmer 3386 3299 trimpot 3269 3296W 3386 TRIMPOT trimmer 3296 trimpot 3296 datasheet
    Text: TRIMMING POTENTIOMETERS July, 2006 Bourns Manufacturers Representatives Corporate Distributor Product Managers Americas Sales Team Asia Sales Team Europe Sales Team Bourns Internal Bourns Plant Managers Trimmer Distributor Product Definition Change Bourns Trimpot® Division is pleased to announce a distributor product definition change on select


    Original     		PDF 3386B 3386C 3386F 3386H 3386P 3386X RJ24FW RJ24FX bourns trimpot 3006P trimpot 3006P 3386F trimmer 3386 3299 trimpot 3269 3296W 3386 TRIMPOT trimmer 3296 trimpot 3296 datasheet

    trimpot 3386 f 102

    Abstract: trimpot 3386
    Text: oH VE S CO AV R M AI SIO PL LA N IA BL S NT E *R Features • Single Turn / Cermet / Industrial / Sealed ■ High voltage types available ■ Available on tape and reel see Model 3386 HV2/3386 HV3 for details ■ RoHS compliant* version available ■ Available with a knob for finger adjust


    Original     		PDF HV2/3386 1000/REEL/BOX trimpot 3386 f 102 trimpot 3386

    trimmer 3386 cw

    Abstract: trimmer 3386 trimmer 3386 h 502
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON 3386 3/8 ˝ Square Trimming Potentiometer Features • Single Turn / Cermet / ■ ■ ■ ■ see page 88 ■ RoHS compliant† version available Product Dimensions Common Dimensions Side Adjust 3386W 1 ADJ. SLOT


    Original     		PDF

    k2645

    Abstract: k4005 U664B mosfet k4005 MB8719 transistor mosfet k4004 SN16880N stk5392 STR451 BC417
    Text: 1 BHIAB Electronics Du som söker besvärliga IC & transistorer, börja Ditt sökande hos oss – vi har fler typer på lager än man rimlingen kan begära av ett företag Denna utgåva visar lagerartiklar men tyvärr saknas priser och viss information Men uppdatering sker kontinuerligt


    Original     		PDF MK135 MK136 MK137 MK138 MK139 MK140 Mk142 MK145 MK155 157kr k2645 k4005 U664B mosfet k4005 MB8719 transistor mosfet k4004 SN16880N stk5392 STR451 BC417

    Untitled

    Abstract: No abstract text available
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor ■ Top and side adjust types F, P, H, W, X


    Original     		PDF HV2/3386 3386P 3386R

    Untitled

    Abstract: No abstract text available
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor ■ Top and side adjust types F, P, H, W, X


    Original     		PDF HV2/3386 3386P 3386R

    schematic diagram atx Power supply 500w

    Abstract: pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 Digital Signal Processors, iCoupler , iMEMS® and iSensor . . . . . 805, 2707, 2768-2769 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-568 RF Connectors . . . . . . . . . . . . . . . . . . . . . . Pages 454-455


    Original     		PDF P462-ND P463-ND LNG295LFCP2U LNG395MFTP5U US2011) schematic diagram atx Power supply 500w pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS

    3386C

    Abstract: 3386H 3386X H-90 POTENTIOMETER 3386
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor ■ ■ ■ Top and side adjust types F, P, H, W, X


    Original     		PDF HV2/3386 1000/REEL/BOX 3386C 3386H 3386X H-90 POTENTIOMETER 3386

    lf 244

    Abstract: 3386C 3386H 3386X H-90 3386-HV2 Bourns 3386H
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor ■ ■ ■ Top and side adjust types F, P, H, W, X


    Original     		PDF HV2/3386 3386F 3386R lf 244 3386C 3386H 3386X H-90 3386-HV2 Bourns 3386H

    panasonic inverter dv 707 manual

    Abstract: 018T A423 Mosfet FTR 03-E Arcotronics 1.27.6 nsl 7053 mkp DX 3500 manual Honeywell DBM 01A Polyester capacitors 823k 250V SPRAGUE powerlytic 36Dx sprague 68D
    Text: PASSIVE COMPONENTS Resistors Networks and Arrays Bourns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 590, 591, 592 Caddock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 CTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594


    Original     		PDF

    bourns 3386 p

    Abstract: trimmer 3386 cw Bourns Trimpot Trimpot 3386H trimpot 3386
    Text: *R oH V SC AV ER OM AI SIO PL LA N IA BL S NT E Features • Single Turn / Cermet / Industrial / Sealed ■ RoHS compliant* version available ■ Available on tape and reel ■ For trimmer applications/processing ■ Available with a knob for finger adjust


    Original     		PDF 1000/REEL/BOX bourns 3386 p trimmer 3386 cw Bourns Trimpot Trimpot 3386H trimpot 3386

    3296 w 103 potentiometer 10k

    Abstract: CT94W104-ND ST3A103 3386F-101-ND ST5W102CT-ND SM-4A20 6639S-1-103-ND ST5P503CT-ND 3006P 203 ST32TG203CT-ND
    Text: Cermet Potentiometers Model ST-32 Surface Mount, Single-Turn 3 1 CW ROTATION 2 FEATURES: • Top and side adjustment styles • Has a rotor with a cross slot for ease of adjustment • Leaded terminals provide strong as adhesive strength against P.C.B. bending • J-hook, Gull wing and leaded terminal configurations • Compatible with P.C. B. pad outline dimensions for ST-3 series • Sealed/Washable


    Original     		PDF 500VDC. 500VAC, TC76B-101-ND TC76B-102-ND TC76B-202-ND TC76B-502-ND TC76B-103-ND TC76B-203-ND YC76B-503-ND TC76B-104-ND 3296 w 103 potentiometer 10k CT94W104-ND ST3A103 3386F-101-ND ST5W102CT-ND SM-4A20 6639S-1-103-ND ST5P503CT-ND 3006P 203 ST32TG203CT-ND

    Nidec 50m

    Abstract: Multi-Turn Potentiometers bi Beckman 67w Nidec rk2-0419-02 TRIMMERS 3006P BECKMAN 89P FT-63EP B 103 Potentiometers SFERNICE ST-42EA smd transistor 44w
    Text: TOCOS P OTENTIOMETERS SEALED TRIMMERS SELECTION GUIDE www.tocos.com TOCOS ® Sealed Models Trimmer Selection Guide POTENTIOMETERS Surface Mount Single-Turn Trimmers Series G43 Series G32 Series Model Examples Nominal Size and Construction 3mm Square Sealed SMD


    Original     		PDF RJC26 GF063P1KT2 GF12P8 Nidec 50m Multi-Turn Potentiometers bi Beckman 67w Nidec rk2-0419-02 TRIMMERS 3006P BECKMAN 89P FT-63EP B 103 Potentiometers SFERNICE ST-42EA smd transistor 44w

    trimmer 3296

    Abstract: bourns trimpot 3006P trimmer 3299W trimmer 3299P 3329H 3299 trimpot bourns 3386 trimpot 3006P trimpot 3386 Bourns 3296y
    Text: July, 2006 Bourns Manufacturers Representatives Corporate Distributor Product Managers Americas Sales Team Asia Sales Team Europe Sales Team Bourns Internal Bourns Plant Managers Trimmer Distributor Product Definition Change Bourns Trimpot® Division is pleased to announce a distributor product definition change on select


    Original     		PDF 3386B 3386C 3386F 3386H 3386P 3386X RJ24FW RJ24FX trimmer 3296 bourns trimpot 3006P trimmer 3299W trimmer 3299P 3329H 3299 trimpot bourns 3386 trimpot 3006P trimpot 3386 Bourns 3296y

    trimpot 3386

    Abstract: Trimpot 3386H 3386 trimpot 3386F bourns 3386 p 3386C 3386H 3386X H-90 3386P-EY5
    Text: *R oH V SC AV ER OM AI SIO PL LA N IA BL S NT E Features • Single Turn / Cermet / Industrial / Sealed ■ High voltage types available ■ Available on tape and reel see Model 3386 HV2/3386 HV3 for details ■ RoHS compliant* version available ■ For trimmer applications/processing


    Original     		PDF HV2/3386 1000/REEL/BOX trimpot 3386 Trimpot 3386H 3386 trimpot 3386F bourns 3386 p 3386C 3386H 3386X H-90 3386P-EY5

    Untitled

    Abstract: No abstract text available
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor ■ Top and side adjust types F, P, H, W, X


    Original     		PDF HV2/3386 3386P 3386R

    Untitled

    Abstract: No abstract text available
    Text: AV DI TH AIL ST RO AB RI U LE BU GH TI ON Features • ■ ■ ■ ■ ■ Single Turn / Cermet / Industrial / Sealed Available on tape and reel see page 71 for details Available with a knob for finger adjust Available with extended shaft Available with cross-slot rotor


    Original     		PDF 3386Y 3386R

    trimpot 3386 cw

    Abstract: bourns 3386 p
    Text: *R oH V SC AV ER OM AI SIO PL LA N IA BL S NT E Features • Single Turn / Cermet / Industrial / Sealed ■ RoHS compliant* version available ■ Available on tape and reel ■ For trimmer applications/processing ■ Available with a knob for finger adjust


    Original     		PDF 1000/REEL/BOX trimpot 3386 cw bourns 3386 p

    smd e2b

    Abstract: 101SX 8026EKW t20yp TYA sfernice 2103P 8038EKP pot0102 3102P Vishay Copal
    Text: CROSS REFERENCE Trimmers VISHAY T TRIMMER CROSS REFERENCE PART NUMBER SUPPLIER VISHAY CROSS PACKAGE TYPE ORDER CODE PACKAGE QUANTITY MOQ COMMENTS 170 VRN T7RYB, T7YB TUBES D 06 50 200 T7R WATER SEALED, T7 DUST SEALED 171 VRN T7RYA, T7YA TUBES D 06 50 200 T7R WATER SEALED, T7 DUST SEALED


    OCR Scan     		PDF 101SX 2103P 25RXR 3006P 3009P 3102P 3102X 3102Y 3102Z 3103P smd e2b 8026EKW t20yp TYA sfernice 8038EKP pot0102 Vishay Copal

    EATON CM20A

    Abstract: A5 GNE mosfet Hall sensor 44e 402 2N8491 FTG 1087 S TRIAC BCR 10km FEB3T smd transistor marking 352a sharp EIA 577 sharp color tv schematic diagram MP-130 M mh-ce 10268
    Text: Table of Contents N E W A R K E L E C T R O N IC S “Where serving you begins even before you call” Newark Electronics is a UNIQUE broadline distributor of electronic components, dedicated to provid­ ing complete service, fast delivery and in-depth inventory. Our main


    OCR Scan     		PDF

    clarostat

    Abstract: clarostat POTENTIOMETER Beckman potentiometer Allen-Bradley resistors BECKMAN 89P clarostat 53c1 mepco rn 30 WA2G056S JA1N056S-UA clarostat POTENTIOMETER 381n
    Text: Cross-Reference Guide To Competitive Products P otentiom eters. 2 Wall Ohmite Allen-Bradley JA1N056S-UA CMU JA1L040S-UA CLU JA1N200S-UA cu I Centralab HMP HML - P otentiom eters. .50 Watt Ohmite Allen-Bradley ASM WA2G056S-UA AS WA2L040S-UA Centralab HN6 HL6


    OCR Scan     		PDF JA1N056S-UA JA1L040S-UA JA1N200S-UA WA2G056S-UA WA2L040S-UA 3006P 3386F 3386P 3386X 3299P clarostat clarostat POTENTIOMETER Beckman potentiometer Allen-Bradley resistors BECKMAN 89P clarostat 53c1 mepco rn 30 WA2G056S clarostat POTENTIOMETER 381n

    clarostat 53c1

    Abstract: clarostat POTENTIOMETER BECKMAN 89P ALLEN-BRADLEY potentiometers clarostat Beckman potentiometer centralab potentiometers JA1N056S-UA VP25k clarostat ALLEN-BRADLEY POTENTIOMETER
    Text: Cross-Reference G u i d e To C o m p e t i t i v e Pr o d u ct s Potentiometers. 1 Watt Allen-Bradley Ohmite JA1N056S-UA CMU JA1L040S-UA CLU JA1N200S-UA CU Centralab HMP HML - Clarostat 53C3 53C2 53C1 Potentiometers. .50 Watt Allen-Bradley Ohmite WA2G056S-UA


    OCR Scan     		PDF JA1N056S-UA JA1L040S-UA JA1N200S-UA WA2G056S-UA WA2L040S-UA 381NS 3006P 3386F 3386P 3386X clarostat 53c1 clarostat POTENTIOMETER BECKMAN 89P ALLEN-BRADLEY potentiometers clarostat Beckman potentiometer centralab potentiometers VP25k clarostat ALLEN-BRADLEY POTENTIOMETER