How to make a volume control 50cm from pre-amp? - diyAudio
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Old 14th October 2012, 05:15 AM   #1
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Default How to make a volume control 50cm from pre-amp?

Hello,

I'm making a pre-amp+power amp unit which goes in to a speaker box (active speaker). The input connector is in back panel and I want to have a volume control (pot or rot switch) in back panel too. The problem is that the back panel is 40cm away from pre-amp.

- It would be easy to wire the input connector to pot and use it as an attenuator. But then I have to increase the gain. No good.

- If I use opamp in pre-amp as a volume control, I'll have 50+50cm wiring and it might pick up noise. Right?

Now I'm thinking to have a digital potentiometer in preamp and control buttons in back panel. Any other ideas?

Thanks,
Tipo
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Old 14th October 2012, 05:44 AM   #2
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Default LDR

Quote:
Originally Posted by tipo1000 View Post
Hello,

I'm making a pre-amp+power amp unit which goes in to a speaker box (active speaker). The input connector is in back panel and I want to have a volume control (pot or rot switch) in back panel too. The problem is that the back panel is 40cm away from pre-amp.

- It would be easy to wire the input connector to pot and use it as an attenuator. But then I have to increase the gain. No good.

- If I use opamp in pre-amp as a volume control, I'll have 50+50cm wiring and it might pick up noise. Right?

Now I'm thinking to have a digital potentiometer in preamp and control buttons in back panel. Any other ideas?

Thanks,
Tipo
Maybe You could use a ldr and a led with a potmeter in series .

Cheers Rens
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Old 14th October 2012, 05:47 AM   #3
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Screend cable will be fine i cant see your problem.

regards Mark
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Old 14th October 2012, 09:48 AM   #4
AndrewT is offline AndrewT  Scotland
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try drawing your layout with simple modules (input, pot, amp, spkr, etc.) showing each part.
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Old 14th October 2012, 10:31 AM   #5
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mount/solder the pot on the pcb of the preamp and then use a metallic or hard plastic cylindrical thin rod to transfer the rotational motion from the back panel to the pot.
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Old 14th October 2012, 11:25 AM   #6
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Quote:
Originally Posted by demeterart View Post
mount/solder the pot on the pcb of the preamp and then use a metallic or hard plastic cylindrical thin rod to transfer the rotational motion from the back panel to the pot.
+1. Put the pot where it should be. Extend the shaft as needed.
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