12V DC gainclone? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 20th January 2010, 09:43 PM   #21
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by Rodeodave View Post

great work from rod, but isn t it somewhat
too risky fr someone that begin building electronic items ?.
  Reply With Quote
Old 20th January 2010, 10:11 PM   #22
diyAudio Member
 
Join Date: Feb 2009
Quote:
Originally Posted by wahab View Post
you did manage to find this circuit easily?...
in another thread, a guy that was looking for the same
kind f amp did write that it was obsolete...
anyway, it should work flawlessly if you respect the
schematic, which is simple...

good luck in your try !!
Philips IC 17-pin ZIP Dual Audio Amplifier | Distributed By MCM
ST IC 5-pin Zip-hs Tda2040v Single Audio Amplifier | Distributed By MCM

Thanks everybody!
  Reply With Quote
Old 21st January 2010, 12:27 AM   #23
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
LA4628? Very easy and quite enjoyable.
  Reply With Quote
Old 21st January 2010, 12:41 AM   #24
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by danielwritesbac View Post
LA4628? Very easy and quite enjoyable.
yes, it s an equivalent circuit in perfs, although it needs
much more external components, and is less rugged than the phillips,
32.5W TDP vs 60 W TDP....
  Reply With Quote
Old 22nd January 2010, 05:20 AM   #25
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by wahab View Post
yes, it s an equivalent circuit in perfs, although it needs
much more external components, and is less rugged than the phillips,
32.5W TDP vs 60 W TDP....
That's odd. The chip with the larger thermal interface has about half the TDP? Really?

One LA4628 on 17.5vdc can run ONE 4 ohm speaker for long term use without breaking down (test used only one channel--not parallel mode). On this test, I was checking durability (voltage per load), not thermal.
It has run this subwoofer Parts-Express.com:*Dayton RS180-4 7" Reference Woofer 4 Ohm | rs225-4 7" woofer midbass rs aluminum cone phase plug dayton long term and continues to operate as expected (a miniature earthquake).
I'm not sure how this test relates to running two speakers on 12vdc regulated power, but it seems that the durability is sufficient.

Since the lowest of notes in music are much louder than expected, I, personally, had no means to compare efficiency of this amplifier. My test was purposefully inefficient to check durability. All I can tell you is that its very clear, and very entertaining.

Last edited by danielwritesbac; 22nd January 2010 at 05:28 AM.
  Reply With Quote
Old 22nd January 2010, 05:31 AM   #26
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by wahab View Post
yes, distorsion is somewhat high, that s why i first proposed to use a TDA2040....
i did build a TDA1558Q amp a few days ago, and i did choose
the bridge configuration as at low power, it allows a distorsionless
sound even at 2 X 10 W...
anyway, the four amps needed to build a stereo bridged amp
are all in the same casing, and the circuit is very simple to implement...
You got me curious, so I bought a pair of TDA1558Q.
  Reply With Quote
Old 23rd January 2010, 04:56 AM   #27
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
lol...hope it will be a good sounding to yours ears...
i didn t find the circuit in the current phillips/nxp
catalog...
it has been replaced since 1997 by the TDA8561Q
wich very marginal improvements and an formerly unused
pin is now used to give informations about output stages
saturations/temperature..the rest stay exactly the same..
anyway,i was first suspicious about this IC, but i mst
aknowledge that it s hard find better , moreover if
we look at the ease of implementation.
  Reply With Quote
Old 27th January 2010, 09:13 PM   #28
diyAudio Member
 
Join Date: Feb 2009
Can somebody explain the grounding system to me? I've read some stuff but it gets a little confusing... they mention secondary and primary groundings (never explaining what's secondary and primary).

Both types of chips I bought have metal backsides. So I assume that means they are non-insulated, so I will need some sort of insulator between them and the heatsink?
  Reply With Quote
Old 27th January 2010, 10:13 PM   #29
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
I don"t know what they mean by primary grounds ,

The secondary ground would be the center tap on a center tapped secondary transformer or on a single secondary transformer it would be the Wire that you use to create your DC ground .....

The primary ground could refer to to Common in Your Houses Ac line or it could be the safety ground from your walls AC outlet ......

You will need to get a Transistor mounting kit with your heatsink , it is simply a Insulation pad for the Chip and a Plastic ring that isolates the mounting bolt from the Chip , and heatsink compound is also needed ....

After mounting the chip use a Multi meter to check if the chip is isolated from the heatsink , Ive had a few occations after mounting and thinking it was isolated only to find it wasnt after checking ......

cheers
  Reply With Quote
Old 28th January 2010, 03:42 AM   #30
diyAudio Member
 
Join Date: Feb 2009
I guess that transformer stuff makes sense since I was looking at a site that addressed typical gainclones... not this atypical approach.

So all grounds will go to the same place? Because the schematic for the 1558Q differentiates between two of the grounds: one goes to signal ground, one goes to power ground (substrate), and another is shown going to a non-specified ground.

And the TDA2040 just shows things going to ground without explanation.


I also read something somewhere which said any grounds coming on the amplification side need to be grounded closer than the signal grounds, so the signal doesn't get corrupted.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Difficulties with DC/DC converter 12V to +/-40V, 8 amps vena2a Power Supplies 16 18th June 2013 01:35 PM
to convert a 12v dc car adapter to support 19 volts dc shadiedog87 Power Supplies 6 31st October 2007 07:27 PM
DC/DC 12V-15V inducterless Transformer Circuit needed Tempest_au Power Supplies 6 22nd May 2007 12:37 PM
12V-220V(ac) to 12V-50V(dc) raszvan Car Audio 0 16th June 2005 08:28 AM
DC-DC converter to get +-12V to feed the ouput opamps in DAC2000 Ryssen Digital Source 12 22nd January 2004 05:04 PM


New To Site? Need Help?

All times are GMT. The time now is 08:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2