A Series Resistance Meter using Operational Amplifiers

Introduction:

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The back issue of QST is here.

meter face panel meter

Materials:

Chute Meter Project
Qty. Description Part Number: Mouser # Price (USD)
4 Aluminum Electrolytic Capacitors - Leaded 50volts 1uF 4x7 20% 1.5LS C1,C2,C5,C6 647-USR1H010MDD $0.23
1 Ceramic Disc Capacitors 50V 1000pF Z5V +80%/-20% Tol C3 140-50Q5-102Z-RC $0.09
1 Ceramic Disc Capacitors 1Kvolts .1uF 20% .375LS Z5U QT REQD C4 75-565R10GAP10 $4.50
2 Rectifiers Vr/1000V Io/1A D1,D2 512-1N4007 $0.14
1 Bipolar Transistors - BJT PNP Gen Pur SS Q1 610-2N3906 $0.41
1 Bipolar Transistors - BJT NPN Gen Pur SS Q2 610-2N3904 $0.41
4 Carbon Film Resistors - Through Hole 10KOhm 1/2W 1200PPM R1,R2,R4,R5 279-CFR50J10K $0.10
1 Carbon Film Resistors - Through Hole 2.4KOhm 1/2W 1200PPM R3 279-CFR50J2K4 $0.11
3 Carbon Film Resistors - Through Hole 27Kohms 0.05 R6,R14,R15 293-27K-RC $0.15
1 Carbon Film Resistors - Through Hole 4.7Kohms 5% R7 293-4.7K-RC $0.15
4 Carbon Film Resistors - Through Hole 1Kohms 0.05 R8,R9,R12,R13 293-1K-RC $0.15
2 Carbon Film Resistors - Through Hole 22ohms 0.05 R10,R11 293-22-RC $0.15
1 Carbon Film Resistors - Through Hole 47Kohms 5% R16 293-47K-RC $0.15
1 Carbon Film Resistors - Through Hole 820ohms 0.05 R18 293-820-RC $0.15
1 Carbon Film Resistors - Through Hole 15Kohms 0.05 R19 293-15K-RC $0.15
1 Carbon Film Resistors - Through Hole 68ohms 0.05 R20 293-68-RC $0.15
2 Operational Amplifiers - Op Amps JFET Input Low Noise U1,U2 595-TL082CP $0.83

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Build Notes:

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Operation Notes:

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References:

QST : April 2014 : meter project by David L. Chute KG4BZW

  1. files: QST in Depth
  2. DC Panel Meter
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Revised: Sunday, March 22, 2015 at 23:09:17 PM (EDT)