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Chip Amps Amplifiers based on integrated circuits

Fake LM1875T - have I been had?
Fake LM1875T - have I been had?
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Old 18th September 2019, 06:12 AM   #11
FauxFrench is offline FauxFrench  France
diyAudio Member
Join Date: Dec 2017
Location: The mountains, calm and quiet.
Originally Posted by asuslover View Post
these are 100% authentic , bought from TI.com .
Where did you get yours?

Good news, they look the same.
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Old 18th September 2019, 08:37 AM   #12
Pentode is offline Pentode  United Kingdom
diyAudio Member
Join Date: Nov 2009

I got them from Tayda Electronics USA and was a little surprised when the package came from Bangkok.... address given earlier in thread. Glad to know they are genuine. Thank you to you all for the replies.

I've managed to cad a single sided board with star earthing, makes you wonder why to go to all this trouble when kits are so cheap.

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Old 25th September 2019, 02:30 PM   #13
sgrossklass is offline sgrossklass  Germany
diyAudio Member
Join Date: Nov 2004
Location: Germany
Originally Posted by Dirttracker73 View Post
The only issue I've experienced was getting NXP branded transistors (BD139 & BD140) when the description shows STMicroelectronics (formerly SGS-Thompson) as the manufacturer. Not what I wanted but they seem to function acceptably.
NXP BD139/140? I don't think there even is such a thing. The Philips parts were well and truly discontinued over a decade ago, it seems unlikely that they even made it to NXP branding.

Suffice it to say, these are probably relabeled. Comparing their junction capacitance with those of (a) BC639/640 (or BCP/BCX53/56, exact same die in SMD, still in production) or (b) ordinary ST BD139/140 may be interesting, or alternatively, trying to build a ~100 MHz oscillator. The Philips parts had 160/190 MHz fT, the others tend to be at 30-50 MHz or so.
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Old 26th September 2019, 07:28 AM   #14
Pentode is offline Pentode  United Kingdom
diyAudio Member
Join Date: Nov 2009
You'll get BD139/140 from Cricklewood Electronics UK, couldn't say what brand though, you could ask them via Email.


Last edited by Pentode; 26th September 2019 at 07:30 AM.
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