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13.6V OK for LDR3x Rev. 2F?

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rajacat

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13.6V OK for LDR3x Rev. 2F?
« on: 14 Jan 2015, 12:08 am »
I have the Astron 12A power supply. It puts out ~13.6V. The LDR3x requires 12V. Is 13.6V too high? I'm nearing the completion of my build  :D...don't want to take any risks.
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G Georgopoulos

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #1 on: 14 Jan 2015, 12:13 am »
should be ok... :green:

to be safe put 2 diodes voltage drop !.4v in series with v+
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rajacat

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #2 on: 14 Jan 2015, 12:41 am »
Quote from: G Georgopoulos on 14 Jan 2015, 12:13 am
should be ok... :green:

to be safe put 2 diodes voltage drop !.4v in series with v+
Hmm... don't have any diodes handy. I was hoping to get it running this evening. Maybe I can adjust the Astron down a little. :scratch:
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TrungT

Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #3 on: 14 Jan 2015, 01:05 am »
No problem powering with Astron.
I tried with Astron before.  :thumb:
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rajacat

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #4 on: 14 Jan 2015, 01:38 am »
Trung,
What did you use for your DC socket?

Thanks,.

Roy
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TrungT

Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #5 on: 14 Jan 2015, 02:00 am »
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tortugaranger

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #6 on: 14 Jan 2015, 02:39 am »
Quote from: rajacat on 14 Jan 2015, 12:08 am
I have the Astron 12A power supply. It puts out ~13.6V. The LDR3x requires 12V. Is 13.6V too high? I'm nearing the completion of my build  :D...don't want to take any risks.

The TLC2274CN rail-to-rail buffer quad op amp used in the auto-cal circuit has a max supply voltage spec of 16 V. This is the limiting factor. I did push supply above 16V out of curiosity one day. It does indeed fail quite undeniably - you can hear it, see it and smell it.  :o

13.6 volts should work ok for the V2

The V2.1 will have socketed op amp so alternatives can be tried. There are other op amps than can handle higher (and lower ) although I've not yet tested alternatives. For example the LT1499 can handle 36V. The two other op amps on the board (not rail to rail) are lowly LM324's which can handle 32V differential which with single sided power should mean +32 V.

(oops, the LT1499 is a surface mount! )
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glynnw

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #7 on: 14 Jan 2015, 02:41 am »
I turned my Astron down to 12V - easy.  Instructions somewhere out on web - sorry, but I don't remember where. Takes about 5 minutes.
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justubes

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #8 on: 20 Feb 2015, 05:50 am »
is 9v sufficient to work instead of 12v?
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tortugaranger

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #9 on: 20 Feb 2015, 01:34 pm »
Quote from: justubes on 20 Feb 2015, 05:50 am
is 9v sufficient to work instead of 12v?

Yes, 9v is sufficient.

Somewhere around 7-8v the on board 5v switch mode regulator will start to have problems but it won't hurt anything, just may not work. 

Keep in mind that if you use the 12v trigger out feature of the board to turn on amps etc the trigger out passes through whatever supply voltage you use so that would end up being 9v as we'll which may not work.
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jtwrace

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Re: 13.6V OK for LDR3x Rev. 2F?
« Reply #10 on: 20 Feb 2015, 01:37 pm »
Quote from: tortugaranger on 20 Feb 2015, 01:34 pm
Keep in mind that if you use the 12v trigger out feature of the board to turn on amps etc the trigger out passes through whatever supply voltage you use so that would end up being 9v as we'll which may not work.
If one had a really nice 9Vdc power supply though they could add a DC - DC converter to the trigger and be fine probably.   :)
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