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2x4HD supply voltage limits 1 month 4 weeks ago #56177

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Hi. I know this has been asked before, and the answer was "just use 12V." But i really need to know what the tolerances are. In my current implementation, it would be very adventageous if i could use 10.6V. I can push that supply to 11.5, but risk instability. I am using a LM317, and the source voltage can dip to 14V according to the spec sheet. Since the LM317 needs 3V headroom, 10.6 would be my safest bet.

It is a part of a larger curcuit.

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2x4HD supply voltage limits 1 month 3 weeks ago #56189

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Are you constrained to using the LM317? If not, I'd look at a DC DC converter. They work great as substitutes for linear regs in many cases.
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2x4HD supply voltage limits 1 month 3 weeks ago #56192

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Quite a bit of rework needed, so i'd rather stick with the current design if possible. I would expect a certain tolerance in the supply voltage, but i can't find it in the datasheet.

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2x4HD supply voltage limits 1 month 3 weeks ago #56193

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2x4HD supply voltage limits 1 month 3 weeks ago #56194

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I've accidentally powered a 2X4HD with 5 V and the result was low output levels and huge increase in distortion (audible and measurable). I do not think I have a 10 V power supply but I certainly do have a 9 V supply, I'll hook it up and see what the output / distortion looks like. 

Michael
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2x4HD supply voltage limits 1 month 3 weeks ago #56197

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I've accidentally powered a 2X4HD with 5 V and the result was low output levels and huge increase in distortion (audible and measurable). I do not think I have a 10 V power supply but I certainly do have a 9 V supply, I'll hook it up and see what the output / distortion looks like. 

Michael

That would be greatly appreciated!

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2x4HD supply voltage limits 1 month 3 weeks ago #56199

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I just ran a quick test on this using my bench supply.
The output ceases with supply voltage at 11.4VDC.

So, 10.5VDC will not work, and 11.5VDC seems marginal, at best.
There you go.

Dave.
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2x4HD supply voltage limits 1 month 3 weeks ago #56200

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Thank you! I wanted to use the same power supply that i use for an active analog crossover, but i guess i'll have to use a dedicated one.

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2x4HD supply voltage limits 1 month 3 weeks ago #56243

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As already mentioned by the great members above, the input is supposed to be regulated already. DC-DC modules are low cost and simple to source. You should be fine to fine one that is doing DC-DC for a wide range of supplies (E.g. automotive) and outputs a stable 12V.

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