LM1876 arduino mute - Page 4

dataplex · 14th January 2013, 09:35 PM

hmmm.... wondering if i wanted the arduino pin HIGH signal to unmute the audio, wouldn't it make sense to connect the audio input signal to pin 3 of the NJM2521, rather than pin1?

that way an arduino LOW signal would mute the inpute, HIGH would let it flow through... amirite?

dataplex · 14th January 2013, 11:45 PM

hope that post before last doesnt go unnoticed..

tauro0221 · 15th January 2013, 12:43 AM

I think your concern it is valid but remember the first thing you should do when you initialize the micro it is immediately set the I/O pins outputs to their start up conditions.

dataplex · 17th January 2013, 10:38 PM

i got the chips from fedex today - for some reason this setup is NOT WORKING

any thoughts on what i might be doing wrong?

Enzo · 17th January 2013, 11:29 PM

I didn't read back through the thread, so sorry if I missed something. But looking at your drawing, I see you are using input #2. And the logic for selecting input 2 involves SW1 being logic HI and SW2 being logic LOW. Your drawing shows no connection at all to SW2. Connect SW2 to ground, and then bringing SW1 hi with your module ought to select input 2 to the output.

tauro0221 · 17th January 2013, 11:35 PM

Hi,
I agreed with Enzo. If you let the input floating internally it is high.

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
cs3318 and arduino	linuxworks	Analog Line Level	72	26th March 2013 11:56 PM
LM1876 Mute by Voltage divider.	pra3718	Chip Amps	26	9th December 2012 01:41 PM
LM1876 Mute & Stand-by	pra3718	Chip Amps	14	23rd November 2012 02:59 PM
need LM1876 mute mode and standby mode help	JozzaG	Chip Amps	21	19th January 2012 05:28 PM
please help - no mute but did mute mod - tda1541	loomis	Digital Source	1	14th November 2002 10:54 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

14th January 2013, 09:35 PM	#31
dataplex diyAudio Member Join Date: Aug 2012	hmmm.... wondering if i wanted the arduino pin HIGH signal to unmute the audio, wouldn't it make sense to connect the audio input signal to pin 3 of the NJM2521, rather than pin1? that way an arduino LOW signal would mute the inpute, HIGH would let it flow through... amirite?

14th January 2013, 11:45 PM	#32
dataplex diyAudio Member Join Date: Aug 2012	hope that post before last doesnt go unnoticed..

15th January 2013, 12:43 AM	#33
tauro0221 diyAudio Member Join Date: Nov 2008 Location: Victoria,TX	I think your concern it is valid but remember the first thing you should do when you initialize the micro it is immediately set the I/O pins outputs to their start up conditions.

17th January 2013, 10:38 PM	#34
dataplex diyAudio Member Join Date: Aug 2012	i got the chips from fedex today - for some reason this setup is NOT WORKING any thoughts on what i might be doing wrong?

17th January 2013, 11:29 PM	#35
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	I didn't read back through the thread, so sorry if I missed something. But looking at your drawing, I see you are using input #2. And the logic for selecting input 2 involves SW1 being logic HI and SW2 being logic LOW. Your drawing shows no connection at all to SW2. Connect SW2 to ground, and then bringing SW1 hi with your module ought to select input 2 to the output.

17th January 2013, 11:35 PM	#36
tauro0221 diyAudio Member Join Date: Nov 2008 Location: Victoria,TX	Hi, I agreed with Enzo. If you let the input floating internally it is high.