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AnaLog Services, Inc. is often asked to repair or upgrade caliper logging tools and surface equipment.  Over the years, we have developed a series of printed circuit boards (PCBs) using some of the best elements of the many designs out there.  Our Low Parts Count AD-537 based caliper tool VFC PCB is a marvel of simplicity and engineering elegance.  All PCBs listed below use readily obtainable components, which parts will continue to be available for many years to come.

Contact us if you have equipment needing an upgrade, or if you wish to obtain PCBs for your own project.  Click on the links in the "PCB" column for photos and additional data on the boards.

Schematic

VFC-3

VFC-3n

VFC3.sch

VFC3n.sch

Low Parts Count AD537 Based Caliper VFC   2" Mounting

VFC-3 for Small Diameter Caliper Tools   2.5" Mounting

CALM-1

CALM-2

CALM1.sch

CALM2.sch

Relayless Motor Control Circuit   2" Mounting

Relay Motor Control Circuit   2" Mounting

106AC-5b

106AC5b.sch

Anti-Coincidence Circuit (GO X-Y Caliper Style)   2" Mounting

106LVPS-1b

106LVPS-2b

106LVPS-3b

106LVPS-3n

106LVPS1.sch

106LVPS2.sch

106LVPS3.sch

106LVPS3.sch

Temp. Comp. Low Voltage Power Supply   2" Mounting

Temp. Comp. Low Voltage Power Supply   2" Mounting

Temp. Comp. LV, Low Current Power Supply   2" Mounting

106LVPS-3 for Small Diameter Caliper Tools   2" Mounting

106LD-3c

106LD-3n

106LD-5c

106LD-7

106LD3.sch

106LD3n.sch

106LD5.sch

106LD7.sch

Dual Channel Pulse Former / Line Driver   3" Mounting

106LD-3 for Small Diameter Caliper Tools   4" Mounting

Single Channel Pulse Former / Line Driver   3" Mounting

Single Xistor Compact Line Driver   2" Mounting

106CCL-1b

106CCL-3b

106CCL-4c

106CCL1.sch

106CCL3.sch

106CCL4.sch

Downhole CCL Amplifier (TIP-120 Style)   2" Mounting

Compact Cascode Downhole CCL Amplifier (GO Style)

Downhole CCL Amplifier (SIE Style)   2" Mounting

Also see PCB Details and Photographs.

02-27-09
Last 02-22-10