aleph 5 - Page 11

Berry · 10th November 2005, 12:19 PM

Try to switch the power supply's, So you know if the supply is ok

intense-tavda · 13th November 2005, 05:17 PM

Hi there!
He berry, they are both working now, the channels, it was not much what was wrong, but one part can do anything wrong, from the left channel it was only Q5 and from the other it was only the 1 ohm resistor only now we have to try it with loudpeaker on it and measering if there is difference between the channels. The transformers are realy loud humming. We wil see what we can do on it. I'll let you know. I am a happy guy now.

Netlist · 13th November 2005, 06:36 PM

Teake,
That's the best news in weeks.

Congrats.
What transformers and VA ratings did you use?

/Hugo

intense-tavda · 13th November 2005, 06:59 PM

Hi Netlist!
Thanks for your reply. I use dubbel mono, two trafo's from 300VA,
2x25v, 6 amp each, one bridge rectifier for each mono-side, for each mono-side i got 2 x 47000UF. On both rails I got 32volt.
greetings Teake

Netlist · 13th November 2005, 07:29 PM

Would you think the hum is related to the current they deliver?
Do they hum when you disconnected the secondaries?

/Hugo

wuffwaff · 13th November 2005, 09:12 PM

Hi,

you could try a dc filter for your transformers (helped in my Aleph 5 (600VA trannies, 25V, 2.5A bias)).

If this doesn´t help you can try to decouple them mechanically.

If this doesn´t help you are as far as I am in my Aleph-X and will probably have to buy new (bigger and better) transformers or place your amps in another room.....

William

intense-tavda · 13th November 2005, 10:33 PM

he william
Thanks I will try this items. You will hear! Greetings teake.

Berry · 14th November 2005, 01:31 PM

What transformers do you use (amplimo/conrad). I use the schuro transformes (Germany), but they also make a humming sound. I also use a DC filter, but without succes.

How can you decouple them mechanically ?

fcel · 14th November 2005, 02:14 PM

1) I was also going to ask what does it mean by mechanically decouple the transformers? Would installing transformers on steel chassis causes more hum?
2) DC filters ... that is to be installed on the primary side of the transformers, right? Any example (link?, pictures?) of a commercially available DC filters?

Berry · 14th November 2005, 02:38 PM

http://www.euronet.nl/~mgw/homepage/uk_index.html

Nice link in dutch and englisch for diy cabel filters !

13th November 2005, 09:12 PM	#106
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, you could try a dc filter for your transformers (helped in my Aleph 5 (600VA trannies, 25V, 2.5A bias)). If this doesn´t help you can try to decouple them mechanically. If this doesn´t help you are as far as I am in my Aleph-X and will probably have to buy new (bigger and better) transformers or place your amps in another room..... William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

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10th November 2005, 12:19 PM	#101
Berry diyAudio Member Join Date: Apr 2004 Location: Netherlands	Try to switch the power supply's, So you know if the supply is ok

13th November 2005, 05:17 PM	#102
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	Hi there! He berry, they are both working now, the channels, it was not much what was wrong, but one part can do anything wrong, from the left channel it was only Q5 and from the other it was only the 1 ohm resistor only now we have to try it with loudpeaker on it and measering if there is difference between the channels. The transformers are realy loud humming. We wil see what we can do on it. I'll let you know. I am a happy guy now.

13th November 2005, 06:36 PM	#103
Netlist diyAudio Moderator Join Date: Jan 2003	Teake, That's the best news in weeks. Congrats. What transformers and VA ratings did you use? /Hugo

13th November 2005, 06:59 PM	#104
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	Hi Netlist! Thanks for your reply. I use dubbel mono, two trafo's from 300VA, 2x25v, 6 amp each, one bridge rectifier for each mono-side, for each mono-side i got 2 x 47000UF. On both rails I got 32volt. greetings Teake

13th November 2005, 07:29 PM	#105
Netlist diyAudio Moderator Join Date: Jan 2003	Would you think the hum is related to the current they deliver? Do they hum when you disconnected the secondaries? /Hugo

13th November 2005, 10:33 PM	#107
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	he william Thanks I will try this items. You will hear! Greetings teake.

14th November 2005, 01:31 PM	#108
Berry diyAudio Member Join Date: Apr 2004 Location: Netherlands	What transformers do you use (amplimo/conrad). I use the schuro transformes (Germany), but they also make a humming sound. I also use a DC filter, but without succes. How can you decouple them mechanically ?

14th November 2005, 02:14 PM	#109
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	1) I was also going to ask what does it mean by mechanically decouple the transformers? Would installing transformers on steel chassis causes more hum? 2) DC filters ... that is to be installed on the primary side of the transformers, right? Any example (link?, pictures?) of a commercially available DC filters?

14th November 2005, 02:38 PM	#110
Berry diyAudio Member Join Date: Apr 2004 Location: Netherlands	http://www.euronet.nl/~mgw/homepage/uk_index.html Nice link in dutch and englisch for diy cabel filters !

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