TDA1554Q Project - Page 2

livenicely · 9th November 2010, 02:03 PM

OK pin no.3 and pin no. ? should be connect with 4.7 ohm resistance. input ground is pin no. ? and can i connect pin no.4 with 470uf 16v

livenicely · 9th November 2010, 02:05 PM

and my amp is just on for 10 sec than osilation for 5 sec than mute. I am using the datasheet application as it is.

LAJ · 9th November 2010, 02:52 PM

to have a hefty power supply. 12Volts at 5 Amps according to the spec sheet. I've got one from a BA745 I found in the someone's trash but I haven't done anything with it. But I think I will build it as a 4 channel amp. And its a good idea to have a hefty heatsink as well.

livenicely · 9th November 2010, 05:32 PM

Quote:

Originally Posted by LAJ

to have a hefty power supply. 12Volts at 5 Amps according to the spec sheet. I've got one from a BA745 I found in the someone's trash but I haven't done anything with it. But I think I will build it as a 4 channel amp. And its a good idea to have a hefty heatsink as well.

Currently i am using 12 volt at 300mA just for testing it and heatsink is not attached. I am just turning on it. no input signal provided just 4 ohm 4 inch speaker connected.

LAJ · 9th November 2010, 05:43 PM

Do you still have 12V after you turn it on? If so your oscillation may be due to insufficient power supply bypass. I'd use at least 1 amp even just for testing (with no signal input.)

livenicely · 9th November 2010, 05:47 PM

i also tested it on a 140A Lead Acid Battery. I have removed 100nf cap on power supply. because the ossilation was still there with that cap so i removed it

kroto · 10th November 2010, 12:15 PM

Quote:

Originally Posted by livenicely

OK pin no.3 and pin no. ? should be connect with 4.7 ohm resistance. input ground is pin no. ? and can i connect pin no.4 with 470uf 16v

I mean pin #3 is the signal(input) gnd in the chip, while the input Gnd is the Gnd where your signal came in (like from input connector which is isolated from the chasis).

you don't have to connect signal Gnd and main(power) Gnd via 4r7. but those resistor will help (a little bit) to give the signal line cleaner grounding.

yes you can use a 16V rating cap for pin #4, its only 1/2 the supply voltage.

sorry for my bad English

kroto · 10th November 2010, 12:20 PM

Quote:

Originally Posted by livenicely

and my amp is just on for 10 sec than osilation for 5 sec than mute. I am using the datasheet application as it is.

do you mean "then" not "than"?
it could be from your PCb layout. maybe your input line way too close to the output line.

livenicely · 10th November 2010, 01:01 PM

I am using polyster capacitor for decoupling. Should i use Ceramic?

kroto · 10th November 2010, 02:34 PM

mine use polyester too. try 220nF.
try ceramics too.

9th November 2010, 02:52 PM	#13
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	The important thing is... to have a hefty power supply. 12Volts at 5 Amps according to the spec sheet. I've got one from a BA745 I found in the someone's trash but I haven't done anything with it. But I think I will build it as a 4 channel amp. And its a good idea to have a hefty heatsink as well.

10th November 2010, 02:34 PM	#20
kroto diyAudio Member Join Date: Jun 2009 Location: Bandung	mine use polyester too. try 220nF. try ceramics too. __________________ _@ö sue

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
TDA1554Q Bridge-Parallel?	kroto	Chip Amps	6	28th December 2011 01:28 AM
TDA1554Q output pins (+), (-)	pra3718	Chip Amps	1	28th January 2009 10:52 AM
TDA1554Q Questions....	DoomPixie	Chip Amps	1	29th May 2006 11:27 AM
TDA1554Q Features	Wilson2004	Chip Amps	8	15th July 2004 06:28 PM
TDA1554Q and LM1036 question	Wilson2004	Solid State	4	13th July 2004 01:56 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


	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

9th November 2010, 02:03 PM	#11
livenicely diyAudio Member Join Date: Nov 2009	OK pin no.3 and pin no. ? should be connect with 4.7 ohm resistance. input ground is pin no. ? and can i connect pin no.4 with 470uf 16v

9th November 2010, 02:05 PM	#12
livenicely diyAudio Member Join Date: Nov 2009	and my amp is just on for 10 sec than osilation for 5 sec than mute. I am using the datasheet application as it is.

9th November 2010, 05:43 PM	#15
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	Do you still have 12V after you turn it on? If so your oscillation may be due to insufficient power supply bypass. I'd use at least 1 amp even just for testing (with no signal input.)

9th November 2010, 05:47 PM	#16
livenicely diyAudio Member Join Date: Nov 2009	i also tested it on a 140A Lead Acid Battery. I have removed 100nf cap on power supply. because the ossilation was still there with that cap so i removed it

10th November 2010, 01:01 PM	#19
livenicely diyAudio Member Join Date: Nov 2009	I am using polyster capacitor for decoupling. Should i use Ceramic?