volume potentiometer

[gianfranco1906]

Hello everyone
I'm new to the forum
I need to insert a volume potentiometer in the following diagram. How can I do?

 

[rayma]

I need to insert a volume potentiometer in the following diagram.

Are you running this amplifier with a balanced input, or single ended?
Are you using two of these amplifiers for stereo?

 

[gianfranco1906]

potenziometro volume

hello thanks for the help, regardless of both inputs or if I connect in balanced or single rca. I have to make two separate final stages, that is, two mono. Thank you kindly, your help would be important and urgent.

An externally hosted image should be here but it was not working when we last tested it.

 

[Mooly]

We still need to know how you plan to use this.

Single ended = easy = standard dual gang volume control wired conventionally. This is the normal way most amps are configured.

Balanced = more difficult = quad gang pot (for stereo) or you fit a conventional control upstream before your audio becomes balanced.

 

[gianfranco1906]

potenziometro volume

guys I reiterate: I'm in the process of creating two separate stages ie two monoblock cases and then there will be a volume control for each monoblock. This volume must act indifferently if I connect to the balanced input or to the single RCA input

 

[Mooly]

I can't just immediately think of a way that can done.

If you want balanced then you have to arrange the circuitry for that... so far so good... but then to use it unbalanced and you still have the balanced set up configured and active. I'd have to give that serious thought and work it through tbh.

These might help:

https://www.diyaudio.com/forums/pas...nuator-dual-channel-balanced.html#post3060481

Wiring Balanced Volume Pots?

 

[Zen Mod]

that's simple

wire ballanced attenuator in front of amp (practically being between input XLR and inputs on pcb)

wire RCA to XLR pins 1 (GND) and 2 (Hot+)

feed it wit balanced signall - OK

feed it with unbalanced signal , put shortie between pins 1 and 3 of XLR - OK

 

[DaveFred]

I can't just immediately think of a way that can done.

If you want balanced then you have to arrange the circuitry for that... so far so good... but then to use it unbalanced and you still have the balanced set up configured and active. I'd have to give that serious thought and work it through tbh.

These might help:

https://www.diyaudio.com/forums/pas...nuator-dual-channel-balanced.html#post3060481

Wiring Balanced Volume Pots?

The relevant graphics have disappeared from site.

Does anyone have a wiring diagram for a two gang pot to control the volume for one XLR input, or for a four gang pot for two XLR's?

 

[Mooly]

Disappeared because they are on externally hosted sites... which is one of the main reasons we like all images to be attached directly to the forum.

 

[KatieandDad]

guys I reiterate: I'm in the process of creating two separate stages ie two monoblock cases and then there will be a volume control for each monoblock. This volume must act indifferently if I connect to the balanced input or to the single RCA input
http://www.kk-pcb.com/aleph-5.html[/IMG[/QUOTE]

Are you trying to produce two separate balanced outputs ? That can be achieved with normal two gang pots, one per channel.

Otherwise you will need a four gang pot. These are available.

I've just finished an Aleph P1.7 balanced pre-amp with an ALPS 4 gang pot controlling the volume.

It's even easier if you look at switched ladder attenuators. You can stack as many switches as you need.

 

[AmpsRus]

These 4 layer ladder potentiometers pop up on ebay for balanced volume control.

1pc 4P 24 Step Attenuator Ladder type Control Pot Log 10K A Stereo Potentiometer | eBay

 

[rikiheck]

I do wonder about these sorts of low-cost items. It looks fine, but...? Of course there are also more conventional options, such as Goldpoint and Khozmo, but those are a LOT more expensive.


Also, just 24 steps seems...wrong.

 

[Zen Mod]

24 steps is fine, if stepped correctly

I'm finding it just proper with step of 2db , in my Iron Turtle AVC

though - I don't have good experience with these ready-made attenuators from ebay - switches are not good enough for audio purpose, after some time you can expect all sorts of problems, loosing contact being just first of them

though - I'm using similar/same 24step switches (two sections in parallel) for commanding relays in AVC, but I'm opening them and putting some grease on contacts, and it does wonders....... and then they're switching just DC, around 12mA

 

[Pars]

This might help. The relays are used for switching between balanced/unbalanced and ground the - signal when in unbalanced mode. You could use a 4P switch for this. Pots used for this application included an Alpha RK2142 and a TKD 4CP601. The Alpha pot is surprisingly good given its low cost. Not easy to find in the US however.

 

[rikiheck]

Thanks for that. Mouser has some Alpha pots, though that part number doesn't give much on Google at all.

 

[rikiheck]

Are you trying to produce two separate balanced outputs ? That can be achieved with normal two gang pots, one per channel.

Otherwise you will need a four gang pot. These are available.

I've just finished an Aleph P1.7 balanced pre-amp with an ALPS 4 gang pot controlling the volume.

It's even easier if you look at switched ladder attenuators. You can stack as many switches as you need.

See here
https://www.diyaudio.com/forums/pass-labs/313612-b1-korg-triode-519.html#post6315742
and the following posts.