LDM
This video shows the repair and test of the encoding altimeter described in the previous episode. After a set of circumstances it turned out that the power op-amp used to drive the DC motor of the servo control has same pinout than the classic audio amplifier LM380. Even if only one power op-amp is defective both ICs are replaced by new LM384. Altitude test is performed after the replacement.
00:00 - Intro
00:07 - Coincidence and chance
02:24 - Removing faulty ICs
04:06 - Soldering LM384 ICs
04:50 - Preliminary test
06:06 - Pneumatic test
08:43 - Digitizer test
links:
LDM #181: Teardown of an Encoding Altimeter ARC EA-401A
• LDM #181: Teardown of an Encoding Altimete...
LDM #77: Design and tests of an Altitude Encoder Tester
• LDM #77: Design and tests of an Altitude E...
LM384 datasheet:
https://www.ti.com/lit/gpn/lm384