STA540 Audio Amp. Add single volume control.

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STA540 Audio Amp. Add single volume control.

Post by bernardo78 » Mon Oct 01, 2018 2:46 pm

I just built the STA540 stereo audio amp and it is fantastic. I would like to put the finished product in an enclosure so it can sit next to my record player and not look like a science project in my living room. Here is my question. Can I control the level of the left and right channels through one potentiometer?

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I have studied the schematic to see if there is a place to add one. It seems like the left and right signals are isolated all the way through the amplifier, and I don't want to mix the signals. I have also read up on the LM358 and STA540 to see if there is an overall output level for either one, but have had no luck. Any help would be appreciated. Thanks.


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Re: STA540 Audio Amp. Add single volume control.

Post by jremington » Mon Oct 01, 2018 5:18 pm

You can certainly buy pots that are stacked, dual units for stereo volume control, like this one: ... 109&chn=ps

Choose log taper of the appropriate resistance and replace the two existing pots.

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