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Aleph5.......it works!!!
Aleph5.......it works!!!
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Old 15th May 2002, 10:19 PM   #1
wuffwaff is offline wuffwaff  Netherlands
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Join Date: Aug 2001
Location: Ingolstadt Germany
Smile Aleph5.......it works!!!

Hello All,

finally finished my Aleph 5 . Well almost, but at least it makes some music and not even bad at all.
Tested the first channel yesterday evening and got about 11A of bias wich was a bit to much for the fuse I used (good thing those fuses). After looking for a while at my printed circuits I found I had made a little mistake while designing the printed circuit mirrored for the left and right channel
Well now the connections to the plus and minus supply donīt look so nice for one channel and Iīll have to make a new board.
The rest works fine, I get 32.5volts before the chokes from a 25v transformer with a 2.8A bias current. After the choke itīs 31.5 volts with a 10mV ripple. DC-Offset is 48mV left and 23mV right.
Temperature is a bit high with 70° C measured directly next to the fets but this will be allright when Iīve corrected the bias to about 2A (donīt really know why itīs so high, any suggestions?)
Output is about 30V at 8 ohms with symmetrical clipping, humm is only noticable with my ear next to the speaker.

Iīve only heard it on my small "upstairs" system with small dynaudio speakers but it sounds like I hoped it would. Very natural but detailed without any harshness, good bass (on this speaker). Iīll try it on my downstairs system when Iīve reset the bias and finished the casing (wouldnīt like my 3 year old daughter to test how well Iīve isolated the mains....)

Hereīs a picture if the right channel,
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Old 15th May 2002, 10:30 PM   #2
Freddie is offline Freddie  Sweden
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Join Date: Oct 2000
Location: Sweden

Concerning the bias, my Aleph also run at somewhat higher bias current than is stated in the service manual but that doesn't bother me too much. Cause I have enough heatsinking. It runs at about 50 degrees C.

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