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This is a "cute" project, and probably sounds pretty good for the minimal bucks involved. The main bonus of this concept is eliminateing an active gain stage with it's colorations. (there are some fairly low coloration active gain stages, but not for low bucks- when you consider the discrete and passive devices required, power supplies, etc).
The real achilles heal is the pots- wiper contacts are prone to noise and low level distortion. A "level 1" upgrade is going with a good dual gang Noble pot from Welborne labs or some other source.
Level two is a good passive mutlipole attenuator from DACT; there's are about 24 position.
Level three is a Shallco based attenuator with 46 steps, like my Marchand PR41, which also has input selection.
But for what you need to do right now, Andrew, this will get you going. Note that if you go this "cheapie" route, you'll have to manually balance the right and left gain; that will prove to be a real pain over time, I expect. Unless you just leave it at a fixed position. That's the biggest reason I'd recommend spending a few bucks on a better attenuator.
In fact, if you want to do something a little more elaborate, I may have an extra Duncan conductove plastic slide attenuator with engraved aluminum panel I could send you. I'll check this weekend- will have to go through a few boxes to find it. But then it would be more like a conventional pot setup. Also, it's 10K input resistance, which may be lower than you want, but should work OK with the CD player.
Regards,
Jon
Earth First!
_______________________________
We'll screw up the other planets later....the AudioWorx
Natalie P
M8ta
Modula Neo DCC
Modula MT XE
Modula Xtreme
Isiris
Wavecor Ardent
SMJ
Minerva Monitor
Calliope
Ardent D
In Development...
Isiris Mk II updates- in final test stage!
Obi-Wan
Saint-Saëns Symphonique/AKA SMJ-40
Modula PWB
Calliope CC Supreme
Natalie P Ultra
Natalie P Supreme
Janus BP1 Sub
Resistance is not futile, it is Volts divided by Amperes...
Just ask Mr. Ohm.... -
Jon at this point I'm open to any suggestions you have...incl your spare parts
I do agree though that a single volume knob for both channels would be much more user friendly
Last edited by theSven; 15 December 2024, 13:41 Sunday.Comment
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Well, it certainly looks "airy" Interesting project.
LexDoug
"I'm out there Jerry, and I'm loving every minute of it!" - KramerComment
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BINGO!!!
Andrew, I found the stash of mixer parts, including the Duncan conductive plastic sliders, eustachions, etc. I do have one extra dual 10K control (there's one which is committed to a preamp project I started about 10 years ago and haven't finished... I'm bad, but I'm getting better... I hope), I'll just have to steal a mounting plate and knob from one of the single slider sets. BTW, slider can be either black or white.
I'll assemble that and then photo it, so you can see what it looks like this weekend. Maybe it will be too wonky a Pro look for you, I don't know... some people like that, though, we know who we are.
Regards,
Jon
Later, from the bowels of the laboratory.....
Image not available
Earth First!
_______________________________
We'll screw up the other planets later....the AudioWorx
Natalie P
M8ta
Modula Neo DCC
Modula MT XE
Modula Xtreme
Isiris
Wavecor Ardent
SMJ
Minerva Monitor
Calliope
Ardent D
In Development...
Isiris Mk II updates- in final test stage!
Obi-Wan
Saint-Saëns Symphonique/AKA SMJ-40
Modula PWB
Calliope CC Supreme
Natalie P Ultra
Natalie P Supreme
Janus BP1 Sub
Resistance is not futile, it is Volts divided by Amperes...
Just ask Mr. Ohm....Comment
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Jon priority one is sound looks are secondary (to a point!) but definitely the black one if possible.Comment
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It occured to me that, in theory at least, a passive line level low pass filter could be made with a pot to create a variable filter that would be useful for experimenting.
The filter is a resister in series with the amp and a parallel cap.
The recommended resistor value... -
First off let me say that this product is too weird.
1)NO power cord
2)NO off/on switch.
How's it supposed to work :?
And what do they mean by "passive"? My old Sony TA-E90ES pre-amp is "passive" too, unless you touch it, it just... -
what is the theory/best practice surroung where to place an attenuator in a preamp design?
assuming 2 gain stages, would it be before, after, or in between the stages?
in my minds eye i'm seeing impedance changes if at the input/output.... -
I was looking at building a simple gain circuit for use in a biamped 3way to to match the woofer level with the mid/tweet due to baffle step. The rest of the XO would be passive. So a active/passive hybrid. This circuit would be placed between the preamp and the amp. So I check Linkwitz's site and found... -
I have always loved passive radiators, so I thought I would finally do a build log along with all the parts needed. Thanks to Parts Express, I am able to bring one of these Passive Radiator Builds to life. My goal was to make a small subwoofer that would still have high spl, for a smaller room all...
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