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Chip Amps Amplifiers based on integrated circuits

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Old 13th April 2004, 01:58 AM   #11
digi01 is offline digi01  China
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very good!

have you make power supply pcb boards use paint paper and FeCl3 ??
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Old 13th April 2004, 02:00 AM   #12
lgreen is offline lgreen  United States
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Default Resistor board

This board sets the LED voltages, each LED has its own trimpot, and I used diodes and base resistors for saftey. Even if you trim to 0 ohms you are still ok, and even if you reverse polarity, you won't blow the LEDs.

This board is fitted for the long cermet trimpots as well as the short stubbier type, just happens that I used all the long ones here, but for BOSOZ, I need two of these with different types of trimpots.

One reason I started this DIY stuff is that I wanted to make my own PCBs, and here in this project we have two. Very interesting even though they can be easily hardwired. I did it for the learning experience. I used Cadsoft Eagle PCB layout, and emailed my designs to www.custompcb.com.

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Old 13th April 2004, 02:11 AM   #13
lgreen is offline lgreen  United States
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Default Front panel

The front panel was designed by me and made by www.frontpanelexpress.com. I used their free software and just emailed my design, they made it of 3mm thick anodized aluminum and it cost around $30. I have a much more complicated one for the BOSOZ which was around $60.

The lettering is etched and then filled with ink by front panel express (I have black and blue ink fill on this faceplate). Black is shown below.

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Old 13th April 2004, 02:23 AM   #14
S.C is offline S.C  United States
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It looks really pretty, and how dose ur not average soccer mommy GC scream like?
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Old 13th April 2004, 02:34 AM   #15
lgreen is offline lgreen  United States
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Default The Sound

I have had this up and running for about 2 weeks, and used it without the differential buffer for another 2 weeks. The amp has very tight bass, and smooth and articulated highs. It does not sound weak at all. And yes, its stable into my Snell E's with 25 feet of speaker wire, as well as into my other speakers and into 5 ohm 100 W resistors. There is no hum at the tweeters at normal levels.

I very much enjoy the sound. Even though I have a ARC tube amp (very old), a BAT VK-200 and a Pass Aleph 3, I get a certain sense of DIY enjoyment out of this, and don't feel like I have sacrificed very much at all. I'm using a huge 500 VA transformer and the amp sounds effortless at all reasonable volume levels. It good to know the design, nothing in there to roll off the high frequencies, which I like, and it has really good extension on the top end.

As I said, this is literally my 1st real DIY project, so please give me all your comments, I really would like to hear from you here or by email (check out my web page). I am an EE by training but went in another direction when I graduated from school 15 years ago, and I didn't know a "via" from a "header" when I started this. Learned about both during the project, bought a soldering iron and a scope. I did this for fun, not to save money, this was not inexpensive.

I hope to have measurements up and posted in 2 or 3 months. I have to work on this stuff on the sly if you know what I mean. This took about 10 months of a little here a little there (in parallel with my BOSOZ, 4 months away from being finished), and the wife says it looks like its from the '70s! Hey, the case is from the '80s get it right!
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Old 13th April 2004, 08:51 AM   #16
Nuuk is offline Nuuk  United Kingdom
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Nice work lgreen!

I was always lead to believe that LED's were noisy items best kept away from hi-fi, even to the point of removing them from the mains distribution strips.

Now, if anybody can say if they are noisy, it should be you as I have never seen so many LED's in one project!

I don't think that I will ask you to disconnect them all though to see if it makes any difference - we may never hear from you again.
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Old 13th April 2004, 10:42 AM   #17
roibm is offline roibm  Romania
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ah, finally I see them...
considering the number and the brightness of the LEDs you won't need that much energy for your bulbs, so I guess it's ok...
not to speak about the signal path which is not really optimized, but nice front tho(except the LEDs thicket)

BTW, what kind of wire did you use?
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Old 13th April 2004, 04:48 PM   #18
lgreen is offline lgreen  United States
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Default LEDs...Oh you noticed?

Too many LEDs? I'm sorry for finishing this project first, my BOSOZ is going to have at least twice as many LEDs (however they will be able to be turned off via front panel switches...switches with LEDs on them of course). I would hate to give you guys the wrong impression that the 8 used on the front panel here are adaquate. My apologies!

I can actually disable these LEDs quite easily, I just unplug either of the 2 receptacles from the 9 pin headers on the LED board, takes about 1 second and it can easily be plugged back in. Doing this, it does not appear that the LEDs actually add noise. So don't ask me to remove the LEDs, I like them! Ok maybe I should have used the smaller size ....hey, this was my 1st project, still learning.

Moreover, if you look at the LED board, each LED is after a diode, which prevents electrical noise created in the LED from going backwards to the power supply that it is powered from. This is good for isolation, but if you are thinking that LEDs create noise that is radiated into the air, well nothing I can do about that except locate them remotely from the circuit, and most are very distant.

To respond to the question about the type of wire, signal wire is DH labs 54927 or 63005 silver cable; speaker cable (the blue cable) is Kimber 51981 4TC (from www.partsconnexion.com).

Here is my 1st go at the BOSOZ panel with openings for illuminated switches, LEDs . This is designed to match, assuming that one is able to see both stacked on each other through the blinding blue and yellowish light. Hmmm.... I wonder if I should start looking for welding masks to protect visitors?
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Old 13th April 2004, 05:09 PM   #19
tiroth is offline tiroth  United States
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Quote:
Originally posted by Nuuk
I was always lead to believe that LED's were noisy items best kept away from hi-fi, even to the point of removing them from the mains distribution strips.
That is complete rubbish. LEDs are often used as voltage reference in hifi regulated supplies and CCS. While not as silent as some references, they are obviously very quiet. Besides, INA13X and LM3886 have tremendous PSRR.
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Old 13th April 2004, 06:51 PM   #20
Nuuk is offline Nuuk  United Kingdom
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Quote:
That is complete rubbish. LEDs are often used as voltage reference in hifi regulated supplies and CCS. While not as silent as some references, they are obviously very quiet.
Yes, I have to admit to having some discrete regulator circuits here that use LED's and they do work well.

This looks like one of those rumours that has been around so long, people like me believe it. At least, my take on it was to leave out LED's if I could as they certainly wouldn't improve the sound, and if there was some negative affect, it was one less thing to worry about.

I did use a couple of blue LED's to light up the tubes in my VBIGC and that also sounds just fine.
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