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miero  
#1 Posted : Saturday, November 1, 2014 1:14:15 PM(UTC)
miero

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Joined: 10/22/2011(UTC)
Posts: 135
Location: Prague

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Here is my try to measure noise spectrum of Placid HD BP 2.1 in audio band.

The the positive/negative rails were connected to audio input via electrolytic capacitor to remove DC offset.

5 figures:
- positive rail unloaded (shunt eta. 150mV)
- positive rail loaded by Legato (shunt eta. 100mV)
- negative rail unloaded (shunt eta. 150mV)
- negative rail loaded by Legato (shunt eta. 100mV)
- Placid not powered

The Y axis is calibrated.

Notice: My Placid HD BP 2.1 has initial problem with negative voltage which I need to fix by changing a circuit a bit.
More in the http://twistedpearaudio....d-at--2-8V----FIXED.aspx

.

Edited by user Saturday, November 1, 2014 1:17:42 PM(UTC)  | Reason: Not specified

miero attached the following image(s):
Placid21BP_unloaded_positive.png (22kb) downloaded 25 time(s).
Placid21BP_positive_Legato100mvShunt.png (22kb) downloaded 18 time(s).
Placid21BP_unloaded_negative.png (23kb) downloaded 10 time(s).
Placid21BP_negative_Legato100mvShunt.png (23kb) downloaded 16 time(s).
Placid21BP_OFF.png (20kb) downloaded 8 time(s).

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miero  
#2 Posted : Saturday, November 1, 2014 1:51:54 PM(UTC)
miero

Rank: Member

Groups: Member
Joined: 10/22/2011(UTC)
Posts: 135
Location: Prague

Thanks: 1 times
Was thanked: 3 time(s) in 3 post(s)
Photo of my Placid HD BP installation: https://drive.google.com...AcAQbVh2SHhEYlBCU0U/view
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