hi, what pot should i use (and resistors if needed) for a passive volume control for just one side of a stereo source, so I won't lose any DBs and keep the two sides of the stereo signal at the same level when the pot is maxed out?
When the pot is "maxed out" it is basically a short circuit. In other words, the resistor part is not in the circuit.
If you want to be extra special careful, use a stepped attenuator.
If you want to be extra special careful, use a stepped attenuator.
right. the thing is, I have wired the L side to a pot, without any resistor, and the right terminal of the pot to ground. it works but the response curve is very weird. i tried different pots. any log pot will go from 0 to 100 almost instantly, and i tried the linear pots that I have (10k and 50k) and they kinda work but the curve starts turning vol up at around 60% of the pot travel.
I just wanted to know what kind of pot I should use for a more linear response curve
I just wanted to know what kind of pot I should use for a more linear response curve
I use an Academy Audio Muses unit, that does not seem to loose dB's. It is certainly the best sound V/C I have every heard & is used now in the Pass Pre amps. the other great thing about this unit is you also get balance cntrl thrown in as well. Using it in my Pass B1-Korg pre.
https://www.academyaudio.com/evc
Cheers
https://www.academyaudio.com/evc
Cheers
Can you be more specific about your purpose?
You want a volume control that only works on one channel, and the other channel is always at maximum?
Or do you just want a lossless balance control?
With a switched discrete resistor control, you can have literally any taper that you want.
You want a volume control that only works on one channel, and the other channel is always at maximum?
Or do you just want a lossless balance control?
With a switched discrete resistor control, you can have literally any taper that you want.
Yeah, basically a volume control for one channel, the other always at max.
Only two important things for this project, it's a cheap DYI so nothing off the shelf, I want to use basically a pot and resistors if needed. And also that when the vol is maxed out, it's basically at the same volume as the other channel, at least no noticeable losses.
Only two important things for this project, it's a cheap DYI so nothing off the shelf, I want to use basically a pot and resistors if needed. And also that when the vol is maxed out, it's basically at the same volume as the other channel, at least no noticeable losses.
It sounds like you may be wiring the pot backwards. If you're looking at the shaft, ground would be the left pin. The middle pin is the wiper(output) and the rightmost pin would be input.
I was wiring them backwards yeah, but that just changed the pot direction, response curve is still the same. should a linear 250k pot result in a more linear volume increase throughout the shaft travel? I kinda just want to know what pot value should I buy before I go buying one of each and trying them individually.
If your sources are all solid state, use a mono 10k log pot.
If some are sources are tube, a 100k or 250k mono log pot would be necessary.
Perhaps a linear pot with a selected resistor from the wiper to ground would work better for you.
Start with a resistor of around 20% of the pot value, and adjust the value up or down as you wish.
If some are sources are tube, a 100k or 250k mono log pot would be necessary.
Perhaps a linear pot with a selected resistor from the wiper to ground would work better for you.
Start with a resistor of around 20% of the pot value, and adjust the value up or down as you wish.
Please wire 1,2 and 3 on your logarithmic pot accordingly, you will know what thirdicomplex meant.
It's all solid state. I wired properly a 10k log pot, but the curve seems to do nothing from 0% up to 80 or 90% and then it starts increasing the volume.
I tried a wide range of resistors wired from wiper to ground, but the only ones below 10k I've got with me right now are 4.7k and 10ohms. 4.7k and anything above 10k did nothing. 10ohms lowered the volume a bit at 100%, but the curve seems the same
So a 10k linear pot is what's worked best for me so far. the resistors didn't help at all, the effect was the same from 10k up to 500k pots, log or linear.
I guess I'll go to the component store tomorrow and see if they have linear pots lower than 10k and try again
I guess I'll go to the component store tomorrow and see if they have linear pots lower than 10k and try again
Using a pot lower than 10k is not necessary. The value of the pot does not determine the behavior.
The electrical taper of the pot, log or linear, and an added wiper resistor, do.
The resistor values you tried are inappropriate. To approximate a log pot with a linear pot,
the added resistor from the wiper to ground should be between 10% and 20% of the pot's ohm value.
For a 10k pot, that is between 1k and 2k. Other values will not be useful.
The electrical taper of the pot, log or linear, and an added wiper resistor, do.
The resistor values you tried are inappropriate. To approximate a log pot with a linear pot,
the added resistor from the wiper to ground should be between 10% and 20% of the pot's ohm value.
For a 10k pot, that is between 1k and 2k. Other values will not be useful.
I guess there already a resistor in the circuit paralleled to the input (or output) of the pot that screw up the curve.
Perhaps add a capacitor in series may help?
Perhaps add a capacitor in series may help?
Certainly there is a resistor after the pot in the circuit already, but with a 10k pot,
that resistor is likely to be large enough to not have a substantial effect compared
to the recommended values for the added resistor, and probably is around 10k to 50k.
that resistor is likely to be large enough to not have a substantial effect compared
to the recommended values for the added resistor, and probably is around 10k to 50k.
there's basically nothing there, just whatever pot I'm testing, between the (L channel from the) stereo out jack and the headphones jack
R channel is connected directly from stereo out to headphones
Ground too, and also to the pot
The only resistors I wired were temporarily the ones from wiper to ground
If I remove the pot from the equation and wire the L channel directly I get the same output level as the pot maxed out without any resistors
In fact I'm gonna eliminate the R channel entirely for testing since what I want is basically a volume pot for a mono channel.
R channel is connected directly from stereo out to headphones
Ground too, and also to the pot
The only resistors I wired were temporarily the ones from wiper to ground
If I remove the pot from the equation and wire the L channel directly I get the same output level as the pot maxed out without any resistors
In fact I'm gonna eliminate the R channel entirely for testing since what I want is basically a volume pot for a mono channel.
