Rank: Member
Groups: Member
Joined: 1/6/2012(UTC)
Posts: 8
Location: Greece
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Dear Russ,
Dear ALL,
Good day and may we have a good year too.
I would like to ask if it is possible to connect two Placid HD in order to give the necessary current to the BIII board. I do the maths and they just donnot add up. More specifically and in accordance with the new BIII manual :
1.) The BIII board requires 440mA together with the
2.) Sidecar requires 65ma
3.) S/PDIF input board requires 30mA
4.) Headroom 60mA
So adding the above we have 440+65+30+60 = 595mA or 600mA for ease of calculation. Can one Placid HD supply this amount of current?
I have read that if we want the Placid to supply over 500mA we should change the heatsinks. However i worry that with this we will stress the whole board too much.
So i thought instead of using one Placid HD, to use two. This way i will not stress the board too much and i will also be able to implement the additional gear you will (most probably) release during this year without thinking of power too much.
Lets say that the first placid Placid HD1 has Out_1 and Out_2 and the second placid HD2 has Out_3 and Out_4. There are two ways (as I see it) to connect the two placids.
A.) In series : We connect Out_1 with the BIII board, Out_2 with Out_3,Out_4 with the BIII board
B.) In parallel : We use two cables, one for each placid HD and the cables from the same polarity( in our case Out_1+Out_3, Out_2&Out_4) we twist them and conect them to the BIII board.
So to summarize :
Can we use two placids HD in order to power the BIII board? If yes, how we should connect them?
Sorry for my big message but trusting to your reply....
Kind Regards,
Fragoulisnaval
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Rank: Member
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Yes, it could provide this amount. Someone has even modified the Placid HD to make it able to deliver around 800-850mA.
Even for 600mA it might need bigger heatsinks, but that also depends on the situation. It's DIY, if you fit all of it in a very small case the heat might not be able to be dissipated fast enough. A heatsinks capacity is dependent on the ambient temperature, if that is high you might need to increase airflow, add heatsink capacity or distribute the load over multiple PSUs.
If you want to use 2 PSUs, connect the DAC to one of them and do NOT connect VD to the sidecar. You can feed it from the second connector (right side) or through the VD pins, and use another PSU to supply both the Sidecar and SPDIF board with power.
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Rank: Member
Groups: Member
Joined: 1/6/2012(UTC)
Posts: 8
Location: Greece
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Thank you! I will add a second PSU following your proposed method. Thanks!!!!
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