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Fixed reading error in DT-9205A multimeter

iroshanjaya

Nov 16, 2023
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"Hello everyone! Just wanted to share a quick update about my DT-9205A multimeter. It wasn't showing any readings, but I managed to fix the issue by replacing the HC14AG SMD IC. Now it's working perfectly! #DIYwin"
 

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73's de Edd

Aug 21, 2015
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VERY weird . . . .in the choice of part number assignment of that I.C. . . . . .UNLESS . . .that was being from the units first line of marking.
In my eyes mind, I would want to see that being as "shorthand" for a "HC14" . . . . . which is a schmitt trigger enhanced hex inverter.. . . . as being a CMOS product
THAT of which is being a high speed CMOS . . . . versus . . . . .being its companion common transistor-transistor-logic product.
BUT the D2905A schematic is showing the ACTUAL use of a quad op amp LM324

Here . . . . . one can plainly see that LM324's were used on DT2905 multimeter boards.

DT9205A_inside_06.jpg


DT9205A_inside_01.jpg



So . . . . . iroshanjaya . . . . .what say you ?

 

Delta Prime

Jul 29, 2020
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photo_1701066121602.pngphoto_1701066068581.png
DT2907A came with the download for DT2905A
photo_1701065810964.png

20231126_223356.jpg
 
Last edited:

Harald Kapp

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So . . . . . iroshanjaya . . . . .what say you ?

Obviously different models, as can be seen by comparing images:
From post #1:
1701067932679.png
From post #4:
1701067996419.png

It seems the name "DT9205A" is used in a generic way for different multimeters:
1701068182665.png
 
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