Bridged TDA2030A problem

bigbeck · 19th December 2010, 10:05 PM

I built the bridged amp from the data sheet schematic and have a case of severe motor boating. Seems like the speaker will blow if I leave it on for more than one second. It does this even if the guitar is not plugged in. If I disconnect the speaker,I can measure 14.5 VDC at the speaker out jack. I'm getting 17 volts at the + & - rails.

I'm thinking I may have fried the chip as I soldered two connections without a heatsink .

What a dope

Prior to this build, I made guitar amps out of a single TDA2050 and TDA2030A. I had a few minor problems with them that have since been sorted.

Any ideas?

Don

bigbeck · 20th December 2010, 03:43 AM

Here's the schematic

TDA2030A datasheet(8/15 Pages) STMICROELECTRONICS | 18W Hi-Fi AMPLIFIER AND 35W DRIVER

ampimp · 21st December 2010, 09:08 AM

Hi
Did you use the pcb layout in the stmicro data sheet???
Ian

AndrewT · 21st December 2010, 10:57 AM

Hi,
where does the lower chipamp get it's inverted signal from?

bigbeck · 21st December 2010, 11:54 AM

Quote:

Originally Posted by AndrewT

Hi,
where does the lower chipamp get it's inverted signal from?

Not sure what you mean. It's built as per schematic. Is there an error on the schematic?

I built it on perf board so the layout is not the same as the data sheet.

I have a small temporary heat sink attached to the chips (20mm X 200mm X 3mm thick) and it gets too hot to touch in about 30 seconds - without the speaker attached.

AndrewT · 21st December 2010, 12:09 PM

If you don't understand Bridged operation then you should not be building bridged amplifiers from a design that has not been proved to work reliably and is recommended by trustworthy peers.

bigbeck · 21st December 2010, 01:01 PM

Andrew, do you see an error on the schematic? Still, I find it hard to believe that no one on this forum has built and tested that circuit.

Don

picowallspeaker · 21st December 2010, 01:13 PM

i did it...about 20 years ago

!!! And I remember I blew two midranges
(so sweeeeet !) with it ...of course : too much current running !
As far as I can remember ...

No good circuit for me 1

I preferred the much powerful version with four transistors plus two TDAs .
With a 100 W (always underrated !) 16+16 V supply ,that amp was a beast !

AndrewT · 21st December 2010, 01:35 PM

I can't see, on the poor copy of the schematic, where

Quote:

Originally Posted by AndrewT

the lower chipamp get it's inverted signal from?

poynton · 21st December 2010, 01:43 PM

Via a resistor from the output of the upper chip.

.

19th December 2010, 10:05 PM	#1
bigbeck diyAudio Member Join Date: Jan 2010	Bridged TDA2030A problem I built the bridged amp from the data sheet schematic and have a case of severe motor boating. Seems like the speaker will blow if I leave it on for more than one second. It does this even if the guitar is not plugged in. If I disconnect the speaker,I can measure 14.5 VDC at the speaker out jack. I'm getting 17 volts at the + & - rails. I'm thinking I may have fried the chip as I soldered two connections without a heatsink . What a dope Prior to this build, I made guitar amps out of a single TDA2050 and TDA2030A. I had a few minor problems with them that have since been sorted. Any ideas? Don

21st December 2010, 10:57 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, where does the lower chipamp get it's inverted signal from? __________________ regards Andrew T.

21st December 2010, 12:09 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	If you don't understand Bridged operation then you should not be building bridged amplifiers from a design that has not been proved to work reliably and is recommended by trustworthy peers. __________________ regards Andrew T.

21st December 2010, 01:43 PM	#10
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Via a resistor from the output of the upper chip. . __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	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

20th December 2010, 03:43 AM	#2
bigbeck diyAudio Member Join Date: Jan 2010	Here's the schematic TDA2030A datasheet(8/15 Pages) STMICROELECTRONICS \| 18W Hi-Fi AMPLIFIER AND 35W DRIVER

21st December 2010, 09:08 AM	#3
ampimp Banned Join Date: Sep 2009 Location: coventry	Hi Did you use the pcb layout in the stmicro data sheet??? Ian

21st December 2010, 01:01 PM	#7
bigbeck diyAudio Member Join Date: Jan 2010	Andrew, do you see an error on the schematic? Still, I find it hard to believe that no one on this forum has built and tested that circuit. Don

21st December 2010, 01:13 PM	#8
picowallspeaker diyAudio Member Join Date: Apr 2007	i did it...about 20 years ago !!! And I remember I blew two midranges (so sweeeeet !) with it ...of course : too much current running ! As far as I can remember ... No good circuit for me 1 I preferred the much powerful version with four transistors plus two TDAs . With a 100 W (always underrated !) 16+16 V supply ,that amp was a beast !

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem with tda2030a+tip41/tip42 120w amp	rrbadrike	Solid State	6	1st April 2012 10:20 AM
XLR Pin#1 problem - Bridged LM4780	GAH	Audio Sector	16	24th September 2009 01:22 AM
Lm3886 Bridged Problem	kanifee	Chip Amps	14	8th September 2008 10:03 AM
A strange problem with bridged LM3875	Mrpong	Chip Amps	28	13th September 2006 03:46 AM
Problem with bridged tda7294	CPX	Chip Amps	9	31st December 2004 10:08 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read