"Signal Lock" Indicator for CS8412/TDA1543

Nisbeth · 5th January 2004, 05:58 PM

Hi There!

I've build Fedde's NONOZ-II DAC using the CS8412/TDA1543-combination and my own PCB-layout. Is there a way to put a "signal-lock"-LED on the CS8412 so I can see if a signal is present on the input of the receiver?

/U.

scottnixon · 5th January 2004, 06:13 PM

Pin 28 of the 8412 goes 'low' with valid signal lock, if that's what you need to know.

rfbrw · 5th January 2004, 06:22 PM

Pin 25, the ERF flag goes high when out of lock. I use a red led to gnd so that it goes out when the signal is locked. Connecting an led between V+ and pin 25 will do the opposite.

Nisbeth · 5th January 2004, 06:25 PM

Quote:

Originally posted by scottnixon
Pin 28 of the 8412 goes 'low' with valid signal lock, if that's what you need to know.

So an LED + a resistor from pin 28 to V+ will give me the indicator I want, right?

/U.

peranders · 5th January 2004, 06:52 PM

Quote:

Originally posted by Nisbeth
Hi There!

I've build Fedde's NONOZ-II DAC using the CS8412/TDA1543-combination and my own PCB-layout. Is there a way to put a "signal-lock"-LED on the CS8412 so I can see if a signal is present on the input of the receiver?
/U.

You can see how I have done. Note also that I take out the frequency information with a flip-flop.

http://home.swipnet.se/~w-50719/hifi...ma_sida_1.html

rfbrw · 5th January 2004, 07:06 PM

Pin 25 not 28. See the datasheet. http://www.geocities.com/rjm003.geo/...pdf/cs8411.pdf

scottnixon · 5th January 2004, 07:42 PM

Nisbeth, I think you've got it... If you hard tie the anode to a +5, a 200 - 1000 ohm ought to do fine, depending on the LED. You can do the reverse with pin 25, BUT I'd rather 'ground' an LED to fire it as opposed to actually using the chips internals to drive it high. That's just me

Nisbeth · 5th January 2004, 09:02 PM

Thanks Scott, I'll try it

/U.

5th January 2004, 05:58 PM	#1
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	"Signal Lock" Indicator for CS8412/TDA1543 Hi There! I've build Fedde's NONOZ-II DAC using the CS8412/TDA1543-combination and my own PCB-layout. Is there a way to put a "signal-lock"-LED on the CS8412 so I can see if a signal is present on the input of the receiver? /U.

5th January 2004, 06:13 PM	#2
scottnixon diyAudio Member Join Date: Mar 2001 Location: High Point, NC	Lock LED Pin 28 of the 8412 goes 'low' with valid signal lock, if that's what you need to know.

5th January 2004, 07:42 PM	#7
scottnixon diyAudio Member Join Date: Mar 2001 Location: High Point, NC	28 is fine Nisbeth, I think you've got it... If you hard tie the anode to a +5, a 200 - 1000 ohm ought to do fine, depending on the LED. You can do the reverse with pin 25, BUT I'd rather 'ground' an LED to fire it as opposed to actually using the chips internals to drive it high. That's just me

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5th January 2004, 06:22 PM	#3
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Pin 25, the ERF flag goes high when out of lock. I use a red led to gnd so that it goes out when the signal is locked. Connecting an led between V+ and pin 25 will do the opposite.

5th January 2004, 07:06 PM	#6
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Pin 25 not 28. See the datasheet. http://www.geocities.com/rjm003.geo/...pdf/cs8411.pdf

5th January 2004, 09:02 PM	#8
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Thanks Scott, I'll try it /U.

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