Hello to all,
I did some googling, but no satisfactory answer I found. Actually I would like to have:
1) Channel splitter. Left and right channel should be split into 2x Left and 2x Right channel. Can it be split into two amp easyly by cables or should I use some chip (operational amp) eg NJR NJM2068DD? Is any nice scheme available somewhere?
2) I need to join two channels into one for subwoofer. So I will have 2xL, 2xR, 1x LR together. The LR 'mixdown' as one channel for subwoofer should not make lower quality of mentioned 2xL, 2xR, there should be kept good channel separation (I guess).
I hope I am not creating some weird configuration! 😕
Thanks for help.
Milan
I did some googling, but no satisfactory answer I found. Actually I would like to have:
1) Channel splitter. Left and right channel should be split into 2x Left and 2x Right channel. Can it be split into two amp easyly by cables or should I use some chip (operational amp) eg NJR NJM2068DD? Is any nice scheme available somewhere?
2) I need to join two channels into one for subwoofer. So I will have 2xL, 2xR, 1x LR together. The LR 'mixdown' as one channel for subwoofer should not make lower quality of mentioned 2xL, 2xR, there should be kept good channel separation (I guess).
I hope I am not creating some weird configuration! 😕
Thanks for help.
Milan
Splitter is easy - Y cables.
Combining L and R channels is a bit trickier. You could use a resistor network, near the single channel input, such as
L IN --10k--X--10k-- R IN
Where X is the output. If my crude diagram makes sense. You could probably get away with smaller resistors (like 2k) depending on what is driving this.
You could then feed that network into a buffer / unity gain opamp (a mixer or summing amplifier), so the input impedance stays consistent on both channels and there is a lower output impedance for whatever is next in the chain. Only trouble is that you'd normally use the inverting input so you'll need to invert it again to not be out of phase. Handily for a subwoofer, you may prefer it to be out of phase so you could switch the second inverting stage in or out.
Combining L and R channels is a bit trickier. You could use a resistor network, near the single channel input, such as
L IN --10k--X--10k-- R IN
Where X is the output. If my crude diagram makes sense. You could probably get away with smaller resistors (like 2k) depending on what is driving this.
You could then feed that network into a buffer / unity gain opamp (a mixer or summing amplifier), so the input impedance stays consistent on both channels and there is a lower output impedance for whatever is next in the chain. Only trouble is that you'd normally use the inverting input so you'll need to invert it again to not be out of phase. Handily for a subwoofer, you may prefer it to be out of phase so you could switch the second inverting stage in or out.
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