Aleph 5 has arrived

SteveA · 18th January 2005, 04:51 AM

I have finally finished, well nearly so, my Aleph 5. I would like to say I did it all by myself, but that would be grossly inaccurate. BDP (Bryan) answered my call for assistance and he held my hand for about two weeks troubleshooting the amp. I learned alot (and I have much-much more to learn).

I am not quite done. The amp plays music nicely, however, I have a bit of noise which doesn't attenuate and it seems to be predominently in one channel. I suppose it's a ground loop. Even with the noise the amp sounds great (once the music overcomes the noise).

It's great to have a forum like this to steal ideas. I've shamelessly copied (at least tried to copy) ideas from a number of chassis designs I've seen.

I am not sure what I should do next. Get rid of the noise in the Aleph 5 or move on and finish the Aleph 2's I've started.

Thanks again to BDP

SteveA

Luke · 18th January 2005, 05:10 AM

nice work.You got any pics to show us

SteveA · 19th January 2005, 07:46 PM

Hi Luke-
I haven't taken any pictures yet but will shortly.
Steve

eLarson · 19th January 2005, 09:08 PM

I'd recommend spending a little time de-buzzing/de-noising the one channel of the Aleph 5. (It would drive me crazy

knowing one channel has it but the other doesn't... but that's just me.)

What type of sound are you hearing? Is it a 120 Hz buzz, or more like a whooshing sound? Perhaps there is a cold solder joint somewhere?

Erik

SteveA · 19th January 2005, 11:21 PM

The noise is a steady buzzing sound. I used a 3 to 2 prong "cheater" to lift the ground (per my "mentor" ; you know who you are) and the buzz was gone. The music isn't tho, this is one nice amp. Still, I will need to figure out how to remove the buzz without the cheater.
Steve

SteveA · 23rd January 2005, 03:50 PM

Here is a picture of my A5 with top and front removed. It's a bit difficult to see the heatsinks but they're R-Theta's (11x11x2.25) . I'll shorten the leads after I remove the ground loop issue.

SteveA

relder · 23rd January 2005, 03:55 PM

Quote:

Originally posted by SteveA
Here is a picture of my A5 with top and front removed. It's a bit difficult to see the heatsinks but they're R-Theta's (11x11x2.25) . I'll shorten the leads after I remove the ground loop issue.

SteveA

Can't get to it, perhaps you need to give permissions for others to see it?

SteveA · 23rd January 2005, 04:16 PM

I just allowed sharing. Try it now.
SteveA

relder · 24th January 2005, 02:43 AM

Quote:

Originally posted by SteveA
I just allowed sharing. Try it now.
SteveA

Yep, works now, fun to see someone else homebrewing PCBs. Seems most Alephs here are using professionally made boards. Mine was ugly, but works: http://www.diyaudio.com/forums/showt...717#post260717

Nice and roomy without the PS circuitry in there. Mine's so tight it's a pain to mod things. Good job, enjoy.

SteveA · 24th January 2005, 03:07 AM

Hi Relder-
I was going to say something about ugly but effective, but after looking at the pics of your Aleph ugly is certainly not a description that comes to mind. Your layout is neat and tidy. Your chassis design is a thing of beauty. Mine should be half as nice and I would be pleased.

I would like to get to the point where I could "brew" the pcb myself but I just used a design I found on the web.

I have a few Aleph 2 boards assembled and tested. I will be ordering transformers, some aluminum, etc to finish them. My goal is to build one of each of the Aleph's. Hopefully during the process I will advance my understanding of electronics.

SteveA

18th January 2005, 04:51 AM	#1
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	Aleph 5 has arrived I have finally finished, well nearly so, my Aleph 5. I would like to say I did it all by myself, but that would be grossly inaccurate. BDP (Bryan) answered my call for assistance and he held my hand for about two weeks troubleshooting the amp. I learned alot (and I have much-much more to learn). I am not quite done. The amp plays music nicely, however, I have a bit of noise which doesn't attenuate and it seems to be predominently in one channel. I suppose it's a ground loop. Even with the noise the amp sounds great (once the music overcomes the noise). It's great to have a forum like this to steal ideas. I've shamelessly copied (at least tried to copy) ideas from a number of chassis designs I've seen. I am not sure what I should do next. Get rid of the noise in the Aleph 5 or move on and finish the Aleph 2's I've started. Thanks again to BDP SteveA

19th January 2005, 09:08 PM	#4
eLarson diyAudio Member Join Date: Aug 2002 Location: Gaithersburg, MD	I'd recommend spending a little time de-buzzing/de-noising the one channel of the Aleph 5. (It would drive me crazy knowing one channel has it but the other doesn't... but that's just me.) What type of sound are you hearing? Is it a 120 Hz buzz, or more like a whooshing sound? Perhaps there is a cold solder joint somewhere? Erik __________________ Would a woodchuck bother to chuck MDF?

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18th January 2005, 05:10 AM	#2
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	nice work.You got any pics to show us

19th January 2005, 07:46 PM	#3
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	Hi Luke- I haven't taken any pictures yet but will shortly. Steve

19th January 2005, 11:21 PM	#5
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	The noise is a steady buzzing sound. I used a 3 to 2 prong "cheater" to lift the ground (per my "mentor" ; you know who you are) and the buzz was gone. The music isn't tho, this is one nice amp. Still, I will need to figure out how to remove the buzz without the cheater. Steve

23rd January 2005, 03:50 PM	#6
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	Here is a picture of my A5 with top and front removed. It's a bit difficult to see the heatsinks but they're R-Theta's (11x11x2.25) . I'll shorten the leads after I remove the ground loop issue. SteveA

23rd January 2005, 04:16 PM	#8
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	I just allowed sharing. Try it now. SteveA

24th January 2005, 03:07 AM	#10
SteveA diyAudio Member Join Date: Dec 2001 Location: St Paul, MN	Hi Relder- I was going to say something about ugly but effective, but after looking at the pics of your Aleph ugly is certainly not a description that comes to mind. Your layout is neat and tidy. Your chassis design is a thing of beauty. Mine should be half as nice and I would be pleased. I would like to get to the point where I could "brew" the pcb myself but I just used a design I found on the web. I have a few Aleph 2 boards assembled and tested. I will be ordering transformers, some aluminum, etc to finish them. My goal is to build one of each of the Aleph's. Hopefully during the process I will advance my understanding of electronics. SteveA

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