I have Vishay VSRT 743R300 0.01% in my storehouse.Their sound quality may be the best IMHO.Can i make potentiometer with them? I think i have about 100pcs in my storehouse,i should check ( i sold about 500of them in a very good price and now i am a bit regretful) If anyone knows a good quality step atteunator please tell me.
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That's exactly what I would have expected but I guess it's an extra cost which most commercial amp builders simply won't accept.
FYI - I don't necessarily want to cancel out the resistor sound. One approach to all this DIY stuff is to design and build to minimize distortions and get as close to a 'wire with gain' as possible. I have found that I like a clean sounding amp. But a second approach is to take advantage of distortions to make a likeable amp. I've moved back and forth between these two camps and finally I find that there is a middle way which suits me best.
There are switched resistor volume control pages out there on the net. For one example: Resistor-Switch Attenuator Networks for Audio Volume Control
Seems like the main question is whether or not you could easily build a volume control with the resistor values you have in stock.
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resistor values?
I have many different values of NOS Holco and Dale mil grade leaded,New Vishay thin film SMD and many kind of Vishay melf resistors.I also have thick film vishay resistors but i heard that it is not good to use them in audio.It seems low noise precision resistors should be selected.Maybe Vishay melf not common values of resistors would be a good choice in a good price.I should make a list of them because of log potentiometers need different type of resistors.
I have many different values of NOS Holco and Dale mil grade leaded,New Vishay thin film SMD and many kind of Vishay melf resistors.I also have thick film vishay resistors but i heard that it is not good to use them in audio.It seems low noise precision resistors should be selected.Maybe Vishay melf not common values of resistors would be a good choice in a good price.I should make a list of them because of log potentiometers need different type of resistors.
Thank you for pointing this out.
A properly selected resistor for a circuit (power and ambient temperature) will not exhibit any consequential thermal modulation by the signal. The thermal inertia will be too high to change the temperature fast enough to introduce anything but drift.
I have read that thermal modulation might be a contributing factor to distortion in chip amps. This claim has merit on theoretical grounds. The whole circuit is tiny and it's all in close proximity (low thermal resistance) so thermal modulation is hypothetically possible. Remember, in a discrete amplifier the input and output stages are not in close thermal contact; in a chip amp they are. So the difference in thermal hysteresis between discrete vs integrated would be significant. How consequential this is , I do not know. I also don't know if it has been investigated, either.
Spoken like a true snakeoil salesman.
When so many people think they can hear something it must be true? Like bybees and shatki stones. First prove people can hear the difference in shunt resistors, you cant. As Scott said the effects are at -180db.
Resistor noise modulation? Now your making stuff up.
Don´t be ridiculous. 😛
Thread is about extravagant claims about claimed gross sonic differences by using a resistor getting a few mV about it, driven from a lower source impedance and you introduce these absolutely irrelevant comparisons.
Are you serious?
Of course not.
As Scott can no doubt explain eloquently, for decades ICs are physically laid out to cancel thermal effects across the chip.
Jan
It is absolutely impossible to answer these questions without knowing where in the circuit they are, the layout, signal levels, etc.
Therefor also a useless question.
Look, I don't want to insult anyone. But if you do not understand a circuit to the level that you know what the function of each resistor is, what the voltage- and current levels are it is subjected to, and the impact of resistor nonlinearities in that position in the application circuit, anything you say about the effect and/or audibility of such a resistor is flying blind. It has no value.
Jan
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That's very clever.
ICs use all kinds of tricks to mitigate very poor tolerances. IC circuitry taught the rest of us how to design for good power supply rejection and widely varying supply voltages.
So true.
There's so much quackery associated with audio.
That would be your assumption.
Audible or not will require investigation. Otherwise it may just be a perceivable difference which includes imagination.
Yeah, just like jumping to conclusion that perceivable difference is audible difference.
I assume that you might have missed my point. (Unless I am wrong) it is held that standard 1/4W 1% metal film resistors are sufficient for the four examples I gave. I know you are familiar with Groner's Super Op-Amp (you started a thread on that) and I assume you are also familiar with the Hall notch filter or at least another similar notch for measurements.
I would also be surprised if you were not sufficiently familiar with the answers to your questions with regards to either DAC I/V & filter example. But I did attach an example PCM1794 I/V and filter schematic for reference. Both the PCM1794 and ES9038Q2M are very widely known. (So I thought they were reasonable references without going into the details. Honestly an op-amp I/V or the following filter in a DAC are hardly that complex?)
My point (with those four examples) is that 1/4W 1% metal film resistors are sufficient for a number of reasonably demanding examples. If I am wrong please go ahead and explain.
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