Calibrated Timer Control K378

Summary: This document is a technical schematic from 1967 for a "Calibrated Timer Control" (K378) designed by the Digital Equipment Corporation. The circuit consists of a simple configuration featuring a 250,000-ohm variable resistor (R1), a 220 MFD capacitor (C1), and a 4,700-ohm resistor (R2). It specifies that R1 is an Allen-Bradley TSRA254i modified clockwise log taper potentiometer and C1 is a Sprague 130D227X9005F0 capacitor or equivalent. The schematic is provided for test and maintenance purposes only.