Hi All,
While "servicing" the volume pot in my Onix OA21s, I found a 16R resistor in the input signal path just before the volume pot.
Does anyone know the function of this resistor, and if they can be taken out? Will be nice to keep the signal path as simple as possible.
Thanks.
While "servicing" the volume pot in my Onix OA21s, I found a 16R resistor in the input signal path just before the volume pot.
Does anyone know the function of this resistor, and if they can be taken out? Will be nice to keep the signal path as simple as possible.
Thanks.
I have done some repairs on Onixs in the past, however never been around the Volume pot though....
What's coming right after the Volume pot ? The resistor properly just ensures a min. resistance if the pot is turned all clockwise.....
What's coming right after the Volume pot ? The resistor properly just ensures a min. resistance if the pot is turned all clockwise.....
Such low value resistors are used in series for preventing parasitic oscillations.
Don't remove it.
Gajanan Phadte
Don't remove it.
Gajanan Phadte
Ok, now that I traced the tracks, thsi is how it goes.
Signal in from RCA -> selector switch -> resistor -> volume pot (10k) -> polorised elec cap (4.7uF) ->..........
Can you tell me what the resistor is for and if it is ok for me to bypass with copper leads?
Also the cap after the volume pot is just a cheap-looking Rubycon 100v 4.7uF polorised elec cap and the signal goes into the cap via +ve side then out from the -ve side.
What cap is recommended here? Maybe a MKP?
Thanks.
Signal in from RCA -> selector switch -> resistor -> volume pot (10k) -> polorised elec cap (4.7uF) ->..........
Can you tell me what the resistor is for and if it is ok for me to bypass with copper leads?
Also the cap after the volume pot is just a cheap-looking Rubycon 100v 4.7uF polorised elec cap and the signal goes into the cap via +ve side then out from the -ve side.
What cap is recommended here? Maybe a MKP?
Thanks.
Hi,
You would have to see it on the circuit to be sure. It must be there for a reason. Have you actually measured it -- 16 ohms is very low to include in the "Top" end of the volume control.
You would have to see it on the circuit to be sure. It must be there for a reason. Have you actually measured it -- 16 ohms is very low to include in the "Top" end of the volume control.
Hi!
I saw this interesting topic and I think a little!
I don't have schematic but that resistor of 13 ohm the colors you hav mentioned say's that it is a 10 ohm resistor but 5% of tolerance is O.K.
As you said that path is:RCA connectors>10 ohm resistor>input selector switch>potentiometer"Volume control".
So all this told us that mentioned resistor is just to protect that input such as cd player or ..., because I guess that when this input is not selected, is selected other input perhaps tuner or... than signal from uselected input goes to the ground via that resistor.
So the purpose for this resistor is just to protect signal devices from short circuit because not all of them is short circuit protected inside!!!
And if you lik to bypass this resistors you must first insure is your signal device is short cut protected, the most of devices such cd players or...are short circuit protected.
About that Rybicon 4.7 microF cap is your choice, but I will tell you that all rybicon caps are good.
By the way also I would like to order RYBICON BLACK GATE or Elna Silmic or ceraphine caps but I don't know where to buy this caps, So if somebody knows where to buy for the lowest price I would appreciatte that .
I hope that now you clearly know purpose of the resistor, again without schematic is hard to saty but I hope that I am 90 per cent right.
I saw this interesting topic and I think a little!
I don't have schematic but that resistor of 13 ohm the colors you hav mentioned say's that it is a 10 ohm resistor but 5% of tolerance is O.K.
As you said that path is:RCA connectors>10 ohm resistor>input selector switch>potentiometer"Volume control".
So all this told us that mentioned resistor is just to protect that input such as cd player or ..., because I guess that when this input is not selected, is selected other input perhaps tuner or... than signal from uselected input goes to the ground via that resistor.
So the purpose for this resistor is just to protect signal devices from short circuit because not all of them is short circuit protected inside!!!
And if you lik to bypass this resistors you must first insure is your signal device is short cut protected, the most of devices such cd players or...are short circuit protected.
About that Rybicon 4.7 microF cap is your choice, but I will tell you that all rybicon caps are good.
By the way also I would like to order RYBICON BLACK GATE or Elna Silmic or ceraphine caps but I don't know where to buy this caps, So if somebody knows where to buy for the lowest price I would appreciatte that .
I hope that now you clearly know purpose of the resistor, again without schematic is hard to saty but I hope that I am 90 per cent right.
If i am right and if the selected input goes through that resistor, perhaps the signal may goes direct from RCA connectors to the potentiometer switched by the input selector.
If the signal path passed through resistor you can change with better one because it is important to use only metal film resistors of 1% tolerance for better thermal noise.
But I guess that signal not passed through resistor specially not 10%of tolerance!
You can check that with a simple multimeter, but first select one input and measure resistance from RCA point to the final point on up side of the pot.
If you measure resistance of 10 ohms than signal is passing through the resistor and you can change it with better one.
PS:Yes, without a schematic just guessing what is it!
If the signal path passed through resistor you can change with better one because it is important to use only metal film resistors of 1% tolerance for better thermal noise.
But I guess that signal not passed through resistor specially not 10%of tolerance!
You can check that with a simple multimeter, but first select one input and measure resistance from RCA point to the final point on up side of the pot.
If you measure resistance of 10 ohms than signal is passing through the resistor and you can change it with better one.
PS:Yes, without a schematic just guessing what is it!
zoranaudio said:
Farnwll is a great source for Rubycon. They do not have Blackgates, but carry ZA, ZL, ZLH, and the latest ZLG at very reasonable prices.
The Silmic II were carried by Digikey, and they still have a few values in stock. The 4.7, 10, and 22 ufd values make great coupling caps if there is a polarizing voltage. The 4.7 and 10 ufd values were 7.5 cents each last year.
Both these types of caps are great. I use the ZA, ZLH, and ZLG for decoupling, and the Silmic II for coupling applications. But they both work fine for either application.
George
Panelhead said:
Thank you George for your information.
I will need just coupling caps for my NAD 1020b preamp clone which I made it few years ago, and I think that coupling caps were high value 100 microfarads.
Now is just soldered simple elco caps so I would like to play a little with just coupling caps to improve a bit a very good sound of my cloned NAD 1020b
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