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-   -   "Signal Lock" Indicator for CS8412/TDA1543 (http://www.diyaudio.com/forums/digital-source/25411-signal-lock-indicator-cs8412-tda1543.html)

Nisbeth 5th January 2004 05:58 PM

"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.

scottnixon 5th January 2004 06:13 PM

Lock LED
 
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

Re: Lock LED
 
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

Re: "Signal Lock" Indicator for CS8412/TDA1543
 
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

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 :)

Nisbeth 5th January 2004 09:02 PM

Thanks Scott, I'll try it :)


/U.


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