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13th February 2003, 04:00 PM
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#1 |
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diyAudio Member
Join Date: Nov 2002
Location: Netherlands
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Please help! Firing up new Aleph 5...
Hi Pass experts,
I just finished one of my Aleph 5 monoblocks and wanted to test it. When I start up the monoblock (nothing connected on the inputs and just the multimeter on the speaker-outputs) I noticed this: The amplifiers starts with about 3 Volt DC on the speakeroutputs, then it slowly goes down to about 0,03 Volt DC after a few minutes. When I shut down the monoblock, the DC voltage rises up to 7 Volt DC and then goes down to abou 3 Volts. It then goes further down but very slowly. What might be wrong? Better not connecting any speakers now? Any help appreciated! Regards, Lucas. |
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13th February 2003, 04:58 PM
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#2 |
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diyAudio Member
Join Date: Sep 2002
Location: near Milano , Italy
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Try connecting a dummy load (a resistor) with a value of about 10 ohms to the output and then check these values again.
The peak voltages should be lower and faster. Next step, if everything is fine, connect a signal generator to the input and a oscilloscope to the output... What about posting some pics? Cheera Andrea |
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13th February 2003, 09:05 PM
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#3 | |
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diyAudio Member
Join Date: Nov 2002
Location: Netherlands
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Quote:
I did that and with a load it had a much lower peak and died out faster. Then I tried a simple auto-speaker. Everything was right. Then I tried this one monoblock on my normal speakers. It performs well... I will post foto's much later since I don't have a digital camera, but I will do it. Thanks again, Lucas |
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14th February 2003, 08:30 AM
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#5 | |
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diyAudio Member
Join Date: Nov 2002
Location: Netherlands
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Quote:
It seems so! Now I must build the second one. This should take only one or two days. However, I am not wholly satisfied with the layout of cables. I use two sets of capacitors (64 mF each) divided by a 3.9 mH inductor. This gives a dreadful salad of cables... Must find a way to lay them out in a cleaner way. Now I heard a slight HF noise, but only when I press my ear close to the speaker. Greetings, Lucas. |
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14th February 2003, 08:38 AM
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#6 |
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diyAudio Member
Join Date: Sep 2002
Location: near Milano , Italy
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I am happy my suggestion worked fine (like your amp!!)
I am in the middle of building a Aleph 30, but since I have very few time its construction is going on slowly... hope to finish it soon.... Cheers Andrea |
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