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Driverboard question
Driverboard question
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Old 18th May 2019, 04:49 PM   #1
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Default Driverboard question

Iím rebuilding a Audio driverboard for an amp itís the driverboard woth 2 icís ir21844s

I ordered mmbt3906/3904 transistors the package says mmbt3904-7-f but according to the markings on the smd transistors they are mmdta42 and mmdta92

Will these transistors work or do I need to order new ones again
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Old 18th May 2019, 04:51 PM   #2
Perry Babin is offline Perry Babin  United States
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Which transistor are you needing to replace? The 390... are low voltage. The 42/92 are high voltage.
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Old 18th May 2019, 04:58 PM   #3
caraudioguy2100 is offline caraudioguy2100
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I need to replace Q3 and Q1 on the driverboard

The transistors I received are marked

K1N which is mmbt3904

K3N which is a mmdta42
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Old 18th May 2019, 05:05 PM   #4
Perry Babin is offline Perry Babin  United States
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What is the brand of the transistor you received?

It's very rare for these to fail. Are you sure they failed?
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Old 18th May 2019, 05:13 PM   #5
caraudioguy2100 is offline caraudioguy2100
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They were missing when I received the amp

Here is the pic of the ones I ordered and what I received.


Also the transistors marked max on them are missing
Would the 2sc3326 be good replacements
Attached Images
File Type: jpg 924EA2DB-FC83-4ECE-B4D2-7B9FD4E3066F.jpg (751.7 KB, 35 views)
File Type: jpg 795595B1-F3BE-4569-844E-F6FE6746FC94.jpg (746.6 KB, 35 views)
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Old 18th May 2019, 05:16 PM   #6
Perry Babin is offline Perry Babin  United States
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Supposedly. I've never had to use them.

K3N:
https://www.mouser.mx/ProductDetail/...hhZVp4dTcTc%3D
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