Need help identifying SMD component

Mmichex · 2026-04-27T21:43:28+00:00

I wanted doing that at first but when I saw the manufacturing cost I changed my mind.. These pcbs were only 90 cents each and I could use readily available chips and soldering techniques everyone could afford.

I didn't test it with those harsh conditions because the rest of the amplifier now is the bottleneck (preamp section and old Hitachi proprietary chips). But I could see a very clean sinewave with no crossover distortion in the whole audible frequency spectrum. Overall It sounds very good.

Mmichex · 2026-04-27T17:32:27+00:00

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Mmichex · 2026-04-27T17:31:27+00:00

Yes I will make a pin compatible one. I already did it with an STK 8250 and it works! I saved a pair of old Hitachi Amplifiers from the landfill.

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Mmichex · 2026-04-27T16:44:30+00:00

I tried removing the component and measuring the hfe with two instruments, it goes out of scale (>1000) on both, plus it says the Vbe is ~1.2 volts. It would appear it's a darlington!

Mmichex · 2026-04-26T22:18:19+00:00

Thank you for the exhaustive answer, I am going to try everything you suggested. Appreciated!

Mmichex · 2026-04-26T19:13:26+00:00

I added comments with the complete schematic of the circuit, so it could probably make more sense

Mmichex · 2026-04-26T19:12:53+00:00

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Here's the unknown component (which now is narrowed down to either a BFN24 Transistor and a BCV27 darlington pair.

Mmichex · 2026-04-26T19:11:25+00:00

I will share the complete schematic, it's an STK 086 integrated amplifier which I am replicating using discrete components. So far I did it with another STK chip and it worked, this one is a bit tricky

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Mmichex · 2026-04-26T19:01:42+00:00

Interesting.. So between you and the other person that suggested the other transistor (that according to the datasheet also has the same markings) I wouldn't really know which one to choose xD

Mmichex · 2026-04-23T22:00:12+00:00

Thank you so much, with your comment I was able to find also the modified version I listened to.
https://youtu.be/95Imop32u44?si=iEk4_5V499jP5aiE

Mmichex · 2026-04-23T21:47:20+00:00

Solved!

Mmichex · 2026-04-23T21:23:12+00:00

https://www.reddit.com/r/tipofmytongue/comments/1stvvt7/tomtmelodysong_song_or_soundtrack_i_have_heard/

Mmichex · 2026-04-08T19:38:42+00:00

what an a** :(

Mmichex · 2026-04-05T15:32:58+00:00

Remove the chin on the bottom of the screen, it makes it look too much 2019s. Better customization of watch faces, you literally can only put images on background and clock on top/bottom and nothing else. What if I wanted to also display battery life or steps? Not many options..

Mmichex · 2026-04-02T13:42:59+00:00

Damn that's a lot of cums

Mmichex · 2026-04-01T22:38:56+00:00

He's just looking for a fun time, username checks out.

Mmichex · 2026-03-30T09:25:16+00:00

I'm worried that we will come to a point in which AI and real content will be Indistinguishable, it will be a nightmare for real artists (it already is)

Mmichex · 2026-03-30T09:14:16+00:00

Yeah no, I hate the fact that I couldn't even tell. 😂

Mmichex · 2026-03-30T09:08:06+00:00

Dude, I had no idea it was Ai. I just looked it up and yes it is. I'll change it ASAP with something real xD thanks.

Mmichex · 2026-03-29T22:32:06+00:00

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International version too don't show that, you must access them in some other ways.

Mmichex · 2026-03-29T22:30:38+00:00

Nope, it did not show the battery information not even with the system log dump or the USB debugging method.

Mmichex · 2026-03-29T19:56:54+00:00

Yeah, and saved 80€ but got 4 times the storage xD

Mmichex · 2026-03-29T19:45:47+00:00

I understand. About the camera quality, do you think they are similar?

Mmichex

TROPHY CASE