Uh Huh....
"As for the board treatment, he had no suggestions. He just changed the tinning solution, so it should solder well. I will keep extra flux on hand for this also.
"
Brian, I have never liked pre-tinned boards - I have seen too many long term problems that do not arise with plain copper/solder masked boards.
Also I reckon that the thrown tin plating process makes a sonically inferior board.
Not gospel, just my long term observations.
Eric.
"As for the board treatment, he had no suggestions. He just changed the tinning solution, so it should solder well. I will keep extra flux on hand for this also.
"
Brian, I have never liked pre-tinned boards - I have seen too many long term problems that do not arise with plain copper/solder masked boards.
Also I reckon that the thrown tin plating process makes a sonically inferior board.
Not gospel, just my long term observations.
Eric.
Well, some of my first impressions listenng to one channel of the X amp, comparing to Aleph 5. The new amp seems to be more relaxed with much better sounding vocal. Although it's only one channel I think I can perceive much more deph. The highs are more silky and bass is less flabby, seems like more control there (overall, it's almost like a curtain was removed ).
It's hard to say how much the improvement is related to better parts and higher bias.
It's hard to say how much the improvement is related to better parts and higher bias.
BrianGT, I must be missing something. Do you have a schematic for your design? I'm counting something like 11 BJTs (or other to-92-packaged devices), seven big 'lytics, four mica (or ?) caps, some weirdo metal cans... what's going on here? Inquiring minds want to know!
Wait, I get it. The stuffed board in the picture isn't your Aleph-X.
Wait, I get it. The stuffed board in the picture isn't your Aleph-X.
It is!
Peter, get that other channel going, it is cuch a nice job You have done, and I am eager to read more about Your comparison between Your Alep and Aleph-X.
Peter, get that other channel going, it is cuch a nice job You have done, and I am eager to read more about Your comparison between Your Alep and Aleph-X.
Peter Daniel said:
How does it effect the sound if you take off the top and sides, compared to fully put together?
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Brian
If I take the top it's OK, but when I take the sides off, I'm loosing heat sinks and it's no good then.😉
Re: Uh Huh....
I really can't complain about the boards, since they didn't cost me anything to get made 🙂 The tinning solution seems to work alright, as long as it hasn't sat too long before being applied, and you clean the surfaces before soldering.
If all works out, I might be getting production quality boards made instead, and trash these, once I verify that it works good.
What is a good amount of capacitance per channel? I notice that Peter is using 128,000uF per channel. I am planning on doing a CRCRC setup with the R being two paralled CL-40s. for each channel. Is 60,000uF a channel enough, or should I go for 120,000uF?
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Brian
mrfeedback said:
I really can't complain about the boards, since they didn't cost me anything to get made 🙂 The tinning solution seems to work alright, as long as it hasn't sat too long before being applied, and you clean the surfaces before soldering.
If all works out, I might be getting production quality boards made instead, and trash these, once I verify that it works good.
What is a good amount of capacitance per channel? I notice that Peter is using 128,000uF per channel. I am planning on doing a CRCRC setup with the R being two paralled CL-40s. for each channel. Is 60,000uF a channel enough, or should I go for 120,000uF?
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Brian
Re: Re: Uh Huh....
I know Nelson started something of a fad with using thermistors in a CRC filter, but I still don't like it. I would expect the resistance of the thermistor to be very near zero at steady state, and therefore your low-pass filter will be quite ineffective. Also current hogging seems likely.
I am using 324,000µF per channel, but the value you require should be determined by the expected performance of your low-pass filtering. Increasing capacitance will decrease the 3dB corner frequency, but it may also cause stress on your rectifier and transformer.
BrianGT said:
I know Nelson started something of a fad with using thermistors in a CRC filter, but I still don't like it. I would expect the resistance of the thermistor to be very near zero at steady state, and therefore your low-pass filter will be quite ineffective. Also current hogging seems likely.
I am using 324,000µF per channel, but the value you require should be determined by the expected performance of your low-pass filtering. Increasing capacitance will decrease the 3dB corner frequency, but it may also cause stress on your rectifier and transformer.
I like CRC idea with thermistors. It provides nice inrush protection at start up. I used 2 CL-60 per rail, not in parallel, but rather separate for ea. side. Same effect; voltage drop on ea is 1V.
Good news everybody. Just before I started desoldering differential pair, I noticed I had a broken solder joint on input to ground resistor. Second channel works equaly well as the first one.😉😎 🙂
Peter,
I think this is a good time to start a new thread so that we don't have to jump between 2 or more threads to read about your progress and that it would be fully documented on one thread. The original Aleph-X is the design stage. The new thread could be called Aleph-X: First Listening Impression or Construction Support / Suggestions.
What do you think?
I think this is a good time to start a new thread so that we don't have to jump between 2 or more threads to read about your progress and that it would be fully documented on one thread. The original Aleph-X is the design stage. The new thread could be called Aleph-X: First Listening Impression or Construction Support / Suggestions.
What do you think?
If seperate threads are made, we will never have a chance at beating the size of the the DIY video projector thread 😀
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Brian
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Brian
An externally hosted image should be here but it was not working when we last tested it.
jwb,
What! You dare question the Masters design. Watch for stray bolts of lightining .........................😉
Jam
P.S. Not in public anyway.
What! You dare question the Masters design. Watch for stray bolts of lightining .........................😉
Jam
P.S. Not in public anyway.
There is already thread for that purpose and I'll stick to this one then:😉 http://www.diyaudio.com/forums/showthread.php?s=&postid=85704#post85704
Re: Re: Re: Uh Huh....
jwb, I don't understand your "current hogging" comment.
The question is, how near to zero? Peter has a 1-volt drop, so it's certainly down in the tenths of an ohm.jwb said:
jwb, I don't understand your "current hogging" comment.
Peter,
told you so! Actually that's the reason I am not as manly as you are I am using a pcb ad 1 pair of devices per side. You still haven't given us the raw numbers.
By the way, Mr. p2p, what are you going to do with those beta boards you are getting?? 😉
About the transformer, I thought you may want a transformer that doesn't punt under load, changing to something that gives you the correct 15-0-15 was my idea.
told you so! Actually that's the reason I am not as manly as you are I am using a pcb ad 1 pair of devices per side. You still haven't given us the raw numbers.
By the way, Mr. p2p, what are you going to do with those beta boards you are getting?? 😉
About the transformer, I thought you may want a transformer that doesn't punt under load, changing to something that gives you the correct 15-0-15 was my idea.
Re: Re: Re: Re: Uh Huh....
The CL-60 resistance is ~.18 ohms once it is done current limiting.
I was planning on using 4 CL-40 per rail in a CRCRC setup (2 paralleled cl-40 in series with caps) giving me ~.11 ohms each rail. I don't want too much of a voltage drop.
NTC CL datasheet:
http://www.thermometrics.com/assets/images/cl.pdf
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Brian
paulb said:
The CL-60 resistance is ~.18 ohms once it is done current limiting.
I was planning on using 4 CL-40 per rail in a CRCRC setup (2 paralleled cl-40 in series with caps) giving me ~.11 ohms each rail. I don't want too much of a voltage drop.
NTC CL datasheet:
http://www.thermometrics.com/assets/images/cl.pdf
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Brian
grataku said:
Wait till you see me ordering rev. 1 boards.😉
I noticed that p2p slows me down. That's probably why I delayed that project. I'm building Home Theatre setup in a basement so 6 boards will go for that, and I already have few other chassis ready and you know... friends.😉 I got a feeling that amp is really good. My daughter's playing some techno right now and it sounds amazing. Bass is really controlled well and quite impressive.
I think most transformers go down with voltage when under high current draw. I observed this before with regular setups.
You look too young to be having daughters playing techno!😉
Unless you're using the same pics that planet10's using.
You let your daughter play with your stereo?
Anyways them beta boards are on their way to HiFZen's place.
Now that I know it should be no biggie getting it to work, I really have to get a move on the components ordering. I have everything I need for an 1/2 assed benchtop version but here it looks like it could be a mk1 already.
Unless you're using the same pics that planet10's using.
You let your daughter play with your stereo?
Anyways them beta boards are on their way to HiFZen's place.
Now that I know it should be no biggie getting it to work, I really have to get a move on the components ordering. I have everything I need for an 1/2 assed benchtop version but here it looks like it could be a mk1 already.