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Old 3rd December 2013, 11:35 PM   #11
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My plan was to have a separate (linear) transformer that supplied the voltage for all the digital electronics. If I'm running the input signal through the relays, why and how will the digital relay driver affect the sound? the relays are either on or off.

but will I potentially get some noise if I hook the gound rail of the Arduino to the ground rail of the amplifier? Maybe it's possible to add an inductor to filter some HF noise?

Ofcource I'll need a big, bright, blue LED so that will get ANY teenager to love me! :P

Last edited by hansibull; 3rd December 2013 at 11:41 PM. Reason: Added more questions ;)
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Old 4th December 2013, 06:22 AM   #12
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Mmm, I am afraid the blue LED is not enough for that. You should also be good at twerking and did you do the Cinnamon Challenge already ?
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Old 4th December 2013, 09:28 AM   #13
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Quote:
Originally Posted by DF96 View Post
If they are not already present then yes. Note that relays don't actually change anything - you still have contacts to make and break. Making a contact between two things at different potentials will cause a click.

Unselected sources can be shunted to ground via resistors - just like the selected source! 1M may do the trick, but a smaller value may be needed if electrolytic caps are used.
Hi, I'm a newbie here, so always nervous while asking questions (they may be silly).

Is this applicable on a Seiden rotary switch? Any schematics available for this? I'll be using it inside a tube pre-amplifier (not a separate switcher chassis)

Regards
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Old 4th December 2013, 09:26 PM   #14
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Quote:
Originally Posted by hansibull
Do you mean that the resistor should be connected to the other terminal on the relay, like this fancy illustration?
That will still click, unless the relay is (unusually) make-before-break.

You need to ensure that everything is at the same DC potential before, during and after any switch transition. That means coupling caps and ground leaks, as I said.
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Old 4th December 2013, 09:28 PM   #15
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Quote:
Is this applicable on a Seiden rotary switch?
What is a Seiden rotary switch?
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Old 4th December 2013, 09:41 PM   #16
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Originally Posted by DF96 View Post
That will still click, unless the relay is (unusually) make-before-break.
I'm going to use a digital potmeter that will adjust the volume down before changing the channel. then It will restore the original volume.
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Old 4th December 2013, 09:43 PM   #17
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The 600R resistor does not do a lot, except perhaps short the signal. Omit it.
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Old 5th December 2013, 12:00 AM   #18
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Originally Posted by hansibull View Post
I'm going to use a digital potmeter that will adjust the volume down before changing the channel. then It will restore the original volume.
this is a great application for ldr's. muting 'relays', so to speak.

I don't think ldr's are that great for audio as vol control elements, but they are ideal for muting. you could then leave the digipot alone, mute the ldr and then unmute it. less 'changes' to the digipot would be best (from experience).
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Old 5th December 2013, 12:11 AM   #19
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this is a great application for ldr's. muting 'relays', so to speak.

I don't think ldr's are that great for audio as vol control elements, but they are ideal for muting. you could then leave the digipot alone, mute the ldr and then unmute it. less 'changes' to the digipot would be best (from experience).
So you say that I should probably use the digital potmeter for muting only, right? My idea was to control the volume with a remote control and a rotary encoder. what can I use instead of a digital potmeter, that a microcontroller can control?
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Old 5th December 2013, 02:35 AM   #20
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no, I meant using an ldr as a muting device (after the digital pot).

the digipot would still be your main vol control but you would not have to change its value just to mute 'between' changes. you'd use one element for vol control and the other (ldr) just for muting.

I personally love the cs3318 atten chip. its noise-free (I can't see or hear noise), its very high-end (for solid state devices) and you have plenty of channels in case you want to go 5.1 or active crossover (which is how I use mine).

I gave up on the PGA chips for various reasons; but the cirrus 3318 is an amazing digital vol control chip. its not cheap and its a little hard to solder to (use a chip carrier) but its my favorite digital pot for audio use.
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