LDM #374: Humphrey directional gyro - teardown, test and reverse engineering

In this video I study and operate a vintage directional gyroscope DG11-0105-1 manufactured by Humphrey Inc., San Diego, California. The heading is slaved to a flux detector connected to the gyroscope. A test is performed using an HSI Collins 331A-8K. 00:00 - Intro 00:40 - Teardown 03:34 - First test and gyro precession 04:50 - Final test with magnetic compass and Collins HSI Reverse engineering: 06:32 - Part 1: overview 07:12 - Part 2: power supply 07:44 - Part 3: inner gimbal horizontal stabilization 08:48 - Part 4: input filter 10:53 - Part 5: amplifier and phase detector 12:29: Part 6: high speed slaving 13:27: Part 7: reference signals generator HSI Collins 331A-8K: Schematic diagram : Blog: