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In Reply to: RE: Ladder stepped attenuator downsides please posted by unclestu on August 14, 2015 at 14:13:24
hello unclestu, thanks for your answer.
good point.
besides the break in, you prefers ladder or series at the end of the day?
regards
Follow Ups:
Cj uses a system which used 13 resistors in series and parallel to get 100 positions. but like a series stepped attenuator, a click one way or another and the sound changed dramatically. Drove me nuts. I ran it one full day (24 hr in the lowest position and another in the next up position up. That helped considerably.
you can get these attenuators on a chipset now. The issue becomes, on high volume inputs you can overload the miniature devices, SMD like.
I like the use of larger resistors. There is no chance of overloading them. That being said, it depends on the input device you use,7. I have successfully used the DAC volume controls and liked them. SMD's do sound different....
1/4 watt isn't large enough? What next? 1/2 watt?
And the stepper I looked at? A series of resistors, or rather resistors in series, with a variable tap. All the current is divided thru ALL the resistors ALL the time.
And for my application, the 24 step version is PLENTY.
It is ALSO a make before break style switch so NO chance of clicks / pops.
Too much is never enough
used an older Theta DAC once: 7 volt + output: overloaded many stepped attenuators
Edits: 08/14/15
How did the overload express itself?
Any chance it was the NEXT input stage which overloaded?
Too much is never enough
distortion at the louder music volumes.
IIRC it was an early issue with ARC preamps using opamp volume controls too.
and that's depends on which stage is placed the attenuator or volume control, I guess.
My SET300B integrated has the control between the first(input tube) and the second stage (driver tubes).
Btw, when you said larger resistors you mean 1w? 2w?
And what's wrong with the ladder attenuators, besides the complex break in?
regards
p.s. my digital source (Sony DVPNS999ES) output voltage is: 2 Vrms/10 kilohms
My connect at Parasound tells me with great authority that to replace the level pot, I need ONLY to use 1/4 watt resistors in a voltage divider net. I suspect that the GoldPoint series attenuator with 1/4 resistors (surface mount) would work Just Fine. The pair of resistors as a divider is if I have decided on the level and don't intend to mess with it.
A level control with 1w or 2w resistors? Pretty darn beefy. In that case I'd be tempted to measure the variable and replace with a divider OR simply modify the circuit for less gain. I don't know enough electronics to figure where such a major device would be of use. Except maybe as a speaker 'L' pad.
Isn't 2v output 'typical'?
Too much is never enough
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