"Signal Lock" Indicator for CS8412/TDA1543 - diyAudio
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Old 5th January 2004, 06:58 PM   #1
Nisbeth is offline Nisbeth  Denmark
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Default "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.
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Old 5th January 2004, 07:13 PM   #2
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Default Lock LED

Pin 28 of the 8412 goes 'low' with valid signal lock, if that's what you need to know.
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Old 5th January 2004, 07:22 PM   #3
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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.
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Old 5th January 2004, 07:25 PM   #4
Nisbeth is offline Nisbeth  Denmark
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Default 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?



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Old 5th January 2004, 07:52 PM   #5
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Default 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
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Old 5th January 2004, 08:06 PM   #6
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Pin 25 not 28. See the datasheet. http://www.geocities.com/rjm003.geo/...pdf/cs8411.pdf
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Old 5th January 2004, 08:42 PM   #7
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Default 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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Old 5th January 2004, 10:02 PM   #8
Nisbeth is offline Nisbeth  Denmark
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Thanks Scott, I'll try it


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