Please help! Firing up new Aleph 5...

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Lucas_G

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Joined 2002
#1
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.
 
#3
Andypairo said:
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
Click to expand...

Thank Andrea!

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
 
#5
Taco said:
Nice job! You build the amplifier without a mistake?
Click to expand...


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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