haha, i study the most basic only, nothing about what might go wrong circumstances X.x
hm... just to be sure, is it a requirement to get a decent potentiometer for this purpose or general is enough ? (someone mention audio taper ? mean algorithm )
hm..... he mention about johnson noise, which increase noise with higher resistant (seems weird ?), then i should get lower value like 100R or 500R pot ? Will try all those this night if i manage to settle my other things
hm... just to be sure, is it a requirement to get a decent potentiometer for this purpose or general is enough ? (someone mention audio taper ? mean algorithm )
hm..... he mention about johnson noise, which increase noise with higher resistant (seems weird ?), then i should get lower value like 100R or 500R pot ? Will try all those this night if i manage to settle my other things
Potential dividers and CR filters are about as basic as you can get. The issue is the pot output impedance (which peaks at a quarter of the total pot impedance - I leave it to you as an exercise to find out why) forms a CR low pass filter with the cable capacitance. The pot total resistance forms a CR high pass filter with the output coupling cap of whatever is driving it.
Don't worry about Johnson noise. You can think about that in a few years time when you are ready to design a phono preamp! At this stage you could think about what a too high or too low resistance pot would do - I have told you the technical basis for this in the first paragraph above.
Don't worry about Johnson noise. You can think about that in a few years time when you are ready to design a phono preamp! At this stage you could think about what a too high or too low resistance pot would do - I have told you the technical basis for this in the first paragraph above.
To connect the pot output goes to the side to which you turn for full volume, input on wiper, ground on side you turn to for 0 volume, that should take care of all possible orientations.
what do you mean by that ? X.x
ohh yeah, if i'm not mistaken, the speaker system at my house has a external attenuation, which enable 2 channel attenuation with single potentio, is it possible to do without mixing 2 channel.
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hm... i go calculate the pot's frequency response, which is using
and the bottom part which is parallel to the input signal, should put a capacitor and resistor in parallel, which represent C12(220pF) and R2+VR2+r5(150047ohm) ?
If like that, almost any number below 1k will do good job within 20-20kHz, is it correct ?
so of course, we and only concern from 20 to 20k Hz or little more than that range, according to the schematic i attached, so i should include a resistor and capacitor in series, which is ?ohm(between input and output of potentio) and 1uF.
and the bottom part which is parallel to the input signal, should put a capacitor and resistor in parallel, which represent C12(220pF) and R2+VR2+r5(150047ohm) ?
If like that, almost any number below 1k will do good job within 20-20kHz, is it correct ?
Attachments
I mean with pins up or pins down, things get lost in explanations, as long as you follow those directions, you will be fine.
Yes, you get dual potentiometers, with 2 sets of 3 pins... for stereo...
hm... i just tried with my surounding available poten which is left over of last project, it was a B2k pot. But the first 45 degree already almost kill the volume to more than quarter, it was a linear pot, so should i get a logarithm once ?
aw..... thats going to kill me ? or should i waiting for scavenge ? X.x
I also notice that when i turn it to minimum, there is very little sound (very little though, maximum would be directly using earphone of sensitivity 89db/w/m from computer 100% source).
How to describe the sound..... its as small as a cat could listen about 1m (lol... i know the description is weird !) ONly can heard it if you put on the earphone, use your hand to cover the earphone around your ear, then you still need to pay attention only could listen.
but if go to high power amp, it sure easily noticeable. any idea why this is happen, or how to overcome ? (or due to low quality pot ?)
I also notice that when i turn it to minimum, there is very little sound (very little though, maximum would be directly using earphone of sensitivity 89db/w/m from computer 100% source).
How to describe the sound..... its as small as a cat could listen about 1m (lol... i know the description is weird !) ONly can heard it if you put on the earphone, use your hand to cover the earphone around your ear, then you still need to pay attention only could listen.
but if go to high power amp, it sure easily noticeable. any idea why this is happen, or how to overcome ? (or due to low quality pot ?)
hm... also another thing, i found that the pot is different when i connect one channel and 2 channel (individual pot), the volume is different, but 2 channel connected with individual pot is obviously better.
Also, in conclusion, the lower the pot value, the higher the roll off ? or should i put it in another view.
The lower the value of pot, then MORE it similar as if without pot, thus better sounding. (I believe this saying is better ?)
Hm... going to get log pot X.x
Also, in conclusion, the lower the pot value, the higher the roll off ? or should i put it in another view.
The lower the value of pot, then MORE it similar as if without pot, thus better sounding. (I believe this saying is better ?)
Hm... going to get log pot X.x
Just to clarify: The output from the previous stage is connected to the pot input at the end you turn to for full volume, and the pot output is taken from the wiper (centre connection) to the input of whatever comes next.digits said:
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