Small Audio Power Devices - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: January 15, 2018, 05:06:41 pm
content: Have you tried building a small audio power (say 5W) recently?All of the ST series of chips have been discontinued by ST Micro and second manufacturers have also dropped the full range. It seems that if you want to build a small amplifier you MUST use a Class D device, which is bad news if you want a single ended audio output referenced to ground.Any ideas what can replace a TDA2002, or a TDA2003 that is NOT a Class D device?

author: MasterT
author_rank: Frequent Contributor
timestamp: January 15, 2018, 07:35:35 pm
content: TDA72XX series still listed as active on digikey. LM1875/LM2876 to name a few others.I get recently TDA7266M (mono version), can't say I'm happy with THD, but it can operate from 3V and cheep.https://www.digikey.ca/product-detail/en/stmicroelectronics/TDA7266M/497-15608-ND/1665067

author: Pitrsek
author_rank: Regular Contributor
timestamp: January 15, 2018, 08:09:10 pm
content: +1 for LM1875, bit bigger that what you have wanted, but otherwise nice IC

author: Kevman
author_rank: Regular Contributor
timestamp: January 15, 2018, 09:20:19 pm
content: LM1875 is probably your best bet if you still want Pentawatt TO-220 packaging. However the Datasheet says the range is 16v-60v, so if you want 12v operation it might not work right?There's also STA540 which is 2/4 channel and uses the annoying multiwatt (ultrawide TO-220) packaging, but its input range goes down to 8v.

author: Zero999
author_rank: Super Contributor
timestamp: January 16, 2018, 11:34:15 am
content: How about the TDA2009A?https://www.mouser.com/ds/2/389/tda2009a-957106.pdfIf you're planning to use a kit, beware. There's one around with some design flaws, which I've fixed. See the thread linked below:https://www.eevblog.com/forum/beginners/poorly-designed-kits/msg1314404/#msg1314404

author: Nauris
author_rank: Regular Contributor
timestamp: January 16, 2018, 12:11:50 pm
content: Quote from: German_EE on January 15, 2018, 05:06:41 pmAt least Unisonic Technologies Co seems to list TDA2003 on their web page and no mention of it being discontinued.

author: calexanian
author_rank: Super Contributor
timestamp: January 16, 2018, 08:49:05 pm
content: Agreed. UTC is making them for allof the cheap PC speakers and such for the time being. I would not plan them into products. Go with more modern components or be bold and design one using discrete components. They are all basic complementary solid state circuits. Easy to reproduce with modern high gain transistors and such.

author: james_s
author_rank: Super Contributor
timestamp: January 16, 2018, 08:54:24 pm
content: It seems class D has taken over most of that market. I can see why though, I have a few small class D modules that were ridiculously cheap, one that does 10Wx2 was under $3 shipped and sounds really good to my ears.

author: David Hess
author_rank: Super Contributor
timestamp: January 17, 2018, 04:56:39 am
content: National (now TI) discontinued theirs some time ago.What I would do now is use a variation of the circuit shown below with the output transistors driven by the supply pins of an operational amplifier. With some cleverness, a dual operational amplifier can be used with both amplifiers driving the output to double the drive current to the transistors.