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 Post subject: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 13 Feb 2019, 00:42 
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Looking at images of the LEXICON AC3-RF LDD-1 demodulator I see a three way toggle switch on the front marked LD OPTIMIZATION: HIGH - LOW - NORMAL

I had a YAMAHA unit quite a while ago & it was simply plug it in & that was it.

Just curious here but what would the HIGH - LOW - NORMAL : LD OPTIMIZATION switch actually do on this unit?

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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 13 Feb 2019, 01:02 
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It was supposed to be optimized based on the players, you can check the documentation on page 4/8 here:

http://manuals.lddb.com/AC3RF_Demodulators/Lexicon_LDD-1-EN.pdf

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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 13 Feb 2019, 02:36 
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Thank-you Julien :thumbup:
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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 15 Feb 2019, 03:48 
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admin wrote:
It was supposed to be optimized based on the players

Julien


Hmmm....wonder if they mean the voltage level of the AC3-RF signal since it can vary from 3.6 to 4.5 volts? Or maybe something different. :?:
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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 25 Apr 2019, 19:49 
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I ordered a LDD-1 few days ago, approximative 150€, less than some Yamaha demod I saw, but this one have the "auto switch" I was looking for (like the Pioneer RFD-1).
But I already opened the beast... :lol:

I need a Toslink optical SPDIF output, so I'll modify the PCB to add this functionnality.
I'd like to have an internal 230V power supply and also modify the "control" fonctionnality to have a 12V trigger in a minijack to power the beast with my AVR 12V trigger output. :)

I'll probably put the circuit in an other box than the original rack mounting one.

Just need some times
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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 20 Apr 2021, 11:03 
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miskia wrote:
Just need some times


Did you ever customize your LDD-1?

I'd be interested in the 12V trigger (using pin 2 GND and pin 3 Trigger of the PWR CTRL DIN?).

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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 27 May 2021, 13:06 
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I tried to get the LDD-1 trigger to work with a standard 0/+12V trigger but... so far no luck.

Of course at 12V, the unit is up.
But at 0V it won't power off.

You need to short signal to GND to make it power off, not a standard trigger :-(

You would expect:

0V => OFF
12V => ON

But it's:

Shorted => OFF
Any voltage => ON

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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 31 May 2021, 05:10 
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Julien,

If 0v is present on the DIN connection you can use a standard 5 pin automotive relay to trigger the unit. Pin 30 of relay to din "sense" input. 87 would have "any voltage" and 87a would be 0v. Terminals 85 and 86 would be wired to your receiver 12v trigger.
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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 31 May 2021, 05:19 
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I actually contacted Lexicon to ask for more wiring details and it seems that the problem is coming from the GND.

The cable I got from eBay splits the DIN5 into 2 mono mini-jacks as follows:

Pin 2 for GND + Pin 3 for Tip
Pin 2 for GND + Pin 5 for Tip

From Lexicon diagram, they expect GND on Pin 1 and Power 12V trigger on Pin 3.

https://manuals.lddb.com/AC3RF_Demodulators/Lexicon_LDD-1-EN-DC_Trigger_Cable_Mini_to_DIN_cable.pdf

I will connect Pin 1 with Pin 2 (and Pin 4 along the way since it's not connected to anything) and get them all to GND.
I just don't have a piece of electrical wire to use/test this right now.

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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 31 May 2021, 08:26 
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Curious about the original question here,
What actually is the difference between those settings? Voltage or?
I read the manual that suggests some models for each usage, do players pump out AC3RF differently?
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 Post subject: Re: Lexicon LDD-1 AC-3 Unit - just curious
PostPosted: 02 Jun 2021, 04:42 
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I was hoping someone would chime in as well and provide a definitive answer.

My initial guess was different voltage levels but after reading the manual for this unit and the JBL version (basically the same) it appears the switch is about adjusting timing. Thus, it appears that Lexicon did believe that different aftermarket AC3-RF mods could speed up or slow down the signal coming out of the RCA jack ("normal" setting is always for factory made AC3-RF outputs).

I don't know how much of this really can be heard and I assume it was not viewed as a huge issue seeing that all the other AC3-RF Demodulators out there never incorporated anything similar. Also, most of the players I use in my set-ups use the aftermarket AC-3 mods and I have never noticed any lip sync issues ever.

I guess the only way to evaluate it would be to try it out in all three settings on different players. My guess would be nothing really discernable but who knows.
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