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Ok,Brian here we go.
AC input; 9.4v
DC large capacitor; 25 vdc
Vin-ccs current 494 mA
Tp out-Tp shunt 494 mA
V out 1.4 v ( increase a little bit when adjust current, but have to adjust very much current to increase a little bit more voltage out )
The led's light up as normal.
Thx
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Are you measuring the CURRENT TP-VIN - TP-CCS? Or are you measuring the voltage (mV)?
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Quote:AC input; 9.4v
DC large capacitor; 25 vdc Is the first measurement AC voltage? If so, these numbers are very strange indeed. So much so that there is something wrong with your meter.
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Originally Posted by: LeonvB  Are you measuring the CURRENT TP-VIN - TP-CCS? Or are you measuring the voltage (mV)? I have measured exactly what Brian was asking for. As I have told before, I have put together an Placid BP, and it measure and works fine in my BII. But this Placid HD seems to be harder to get working properly.
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Originally Posted by: Brian Donegan Quote:AC input; 9.4v
DC large capacitor; 25 vdc Is the first measurement AC voltage? If so, these numbers are very strange indeed. So much so that there is something wrong with your meter. I use 18vac transformer, and the large capacitor is Mundorf silver in oil, 33000uf - 40vdc. Maybe that explain the strange numbers ? I use Mundorf 22000uf-40vdc on Placid BP, and it works like a dream.
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You can estimate rectified DC voltage as Vac * 1.4. That woudl be 9.4VAC * 1.4 = 13.16V. 25VDC is way off, so something is amiss with your measurement. Do you measure DC voltage at the input?
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Originally Posted by: musicman Originally Posted by: Brian Donegan Quote:AC input; 9.4v
DC large capacitor; 25 vdc Is the first measurement AC voltage? If so, these numbers are very strange indeed. So much so that there is something wrong with your meter. I use 18vac transformer, and the large capacitor is Mundorf silver in oil, 33000uf - 40vdc. Maybe that explain the strange numbers ? I use Mundorf 22000uf-40vdc on Placid BP, and it works like a dream. That must be fairly easy to prove - revert to the original supplied cap and test that. Also test the 18v from x-former when the x-former is disconnected from the Placid. Edited by user Thursday, March 7, 2013 6:44:52 PM(UTC)
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Thanks all for trying solv my problem. The Placid went up in smoke when powering up the dac, so I will order a new one and hope I have better luck next time.
Only my self to blame, and I am very satisfied with my TPA BII dac.
Tnx
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