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Old 21st June 2011, 12:03 AM   #21
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Originally Posted by BrianDonegan View Post
It's mainly just better for higher-current applications.
How much current can it provide? Also what's the max I could get out of an LCDPS just out of interest?
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Old 21st June 2011, 05:20 AM   #22
LeonvB is offline LeonvB  Netherlands
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I think Russ stated a design limit of 1.5A for the HD PSUs, I have no idea what would be the practical limit. The LCDPS is around 500mA on both circuits as it is shipped (latest version), but you could mod it to go higher (mainly bigger heatsinks).
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Old 21st June 2011, 10:04 AM   #23
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Originally Posted by LeonvB View Post
I think Russ stated a design limit of 1.5A for the HD PSUs, I have no idea what would be the practical limit. The LCDPS is around 500mA on both circuits as it is shipped (latest version), but you could mod it to go higher (mainly bigger heatsinks).
What tweaks would you need to make to the LCDPS to get it up to, say, 1.5A? I
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Old 21st June 2011, 10:47 AM   #24
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Originally Posted by BrianDonegan View Post
I am sorry for my rant. I have had a beer, and regret my snippiness.
better get two next time!
this is a typical situation where a hobby starts to move onto a more serious path and some serious decisions have to be made in the near future
anyway; keep it up
Ive bought a fair load of stuff from you and have never been disappointed
just impatient
best
Leif
Norway
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Old 21st June 2011, 12:28 PM   #25
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The LCDPS is around 500mA on both circuits as it is shipped (latest version), but you could mod it to go higher (mainly bigger heatsinks).
There is no reason the LCxPS can not deliver 1A. The limiting factor is the LM317/337 and the power resistor you use. The current 2R7 should let it go much higher then 500mA.
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Old 21st June 2011, 01:57 PM   #26
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On the question of the new HD Placid; I'm about to go dual-mono and I've got all the modules, apart from another set of Tridents, to do so.

My current Buffalo/Trident and TOSlink module works fine with the standard Placid (suitably cranked up) but I've also got an MUX 4.1 which I've been reluctant to add to the Placid's burden. I wonder then, would it be acceptable to use one standard Placid as now for Buff/Trident & a HD Placid for the other channel plus the MUX? Or would this imbalance in power supplies have an affect of sound quality?
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Old 21st June 2011, 05:56 PM   #27
LeonvB is offline LeonvB  Netherlands
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Tony, I have no problem with even the normal Placid here. I'm running dual mono on 2 normal Placids, one to just the BII+Tridents, one to that and the Mux + Toslink module. As long as you can shunt enough current it should be fine.

@Brain: wouldn't you need a much bigger heatsink for currents like 1A?
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Old 21st June 2011, 06:53 PM   #28
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It would depend on some degree (ha) what the voltage drop is, in addition to the total current draw. Even with the kit heatsinks, you could provide a good amount of current before needing to go larger. It would also depend on the type of load you have (meaning, how constant the actual current draw is).

The LM317 can function up to 1.5A and a Tj of 125C.
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Old 21st June 2011, 09:15 PM   #29
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Thanks for that very helpful post Leon. I'll stick with my two standard Placids and be content!
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Old 21st June 2011, 10:51 PM   #30
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Originally Posted by BrianDonegan View Post
It would depend on some degree (ha) what the voltage drop is, in addition to the total current draw. Even with the kit heatsinks, you could provide a good amount of current before needing to go larger. It would also depend on the type of load you have (meaning, how constant the actual current draw is).

The LM317 can function up to 1.5A and a Tj of 125C.
I'm looking to power a BeagleBoard, which wants 5V at somewhere between 1A and 3A depending on which parts of it need power, with the higher end only needed if you're trying to run full power to all of its USB ports. I'm planning on only needing to power its Ethernet interface and one USB port, which shouldn't need any additional current beyond the default 100mA, and tap the I2S output to feed to a Buffalo.
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