Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Fake LM1875T - have I been had?
Fake LM1875T - have I been had?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
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.
Quote:
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.
  Reply With Quote
Old 18th September 2019, 08:37 AM   #12
Pentode is offline Pentode  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
@Dirttracker73

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.

Dave
  Reply With Quote
Old 25th September 2019, 02:30 PM   #13
sgrossklass is offline sgrossklass  Germany
diyAudio Member
 
Join Date: Nov 2004
Location: Germany
Quote:
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.
  Reply With Quote
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.

Dave

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

Reply


Fake LM1875T - have I been had?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
TDA2040 vs LM1875T for guitar amp djduck Instruments and Amps 6 1st November 2015 07:23 AM
TDA2030A board with LM1875T? djduck Chip Amps 7 14th April 2015 07:23 AM
Hum on LM1875T - I can not get rid of it mertol Chip Amps 15 10th December 2011 07:31 PM
LM1875T freq. response jamal Chip Amps 5 23rd November 2010 02:35 PM
In memoriam LM1875T -- we had so lttle time Omega_Void Chip Amps 41 19th May 2010 02:09 PM


New To Site? Need Help?

All times are GMT. The time now is 02:30 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki