Hi, I am trying to design an input selector with ground switch.
Actually, there is a DC leak resistor 1M for the unused input's ground.
In terms of input channels crosstalk issues:
- is it good idea to load the unused input (to its own ground), instead of leaving it floating?
In my schematic we have R11/12-21/22 (10-22 k?).
They load the input signal to its own ground.
But the signal's ground is connected to device ground through the leak resistor (R1/2, 1M)..
Regards
Actually, there is a DC leak resistor 1M for the unused input's ground.
In terms of input channels crosstalk issues:
- is it good idea to load the unused input (to its own ground), instead of leaving it floating?
In my schematic we have R11/12-21/22 (10-22 k?).
They load the input signal to its own ground.
But the signal's ground is connected to device ground through the leak resistor (R1/2, 1M)..
Regards
In my Sony TA-E86B the unused input signals are solidly shorted to the ground of the preamp. Both my Technics tuners and the Technics CD player has no problem with this for many years now. Even the internal phono prepre amp is shorted this way.
If a signal source cannot withstand this, it is probably cheap.
If a signal source cannot withstand this, it is probably cheap.
What if I leave a load resistor of - f.ex. 1k?
(R11/12-R21/22)
Most line outputs should handle it with no damage.
Combined with some small cap to leak the HF directly to source's ground.
Is the current going through the res || cap chain going to do more harm in terms of inputs crosstalk?
Would it be better to leave unused input open?
And mind that the source ground of unused input is connected to system ground via large leak resistor.
(To prevent dc build up and switching pop noise).
(R11/12-R21/22)
Most line outputs should handle it with no damage.
Combined with some small cap to leak the HF directly to source's ground.
Is the current going through the res || cap chain going to do more harm in terms of inputs crosstalk?
Would it be better to leave unused input open?
And mind that the source ground of unused input is connected to system ground via large leak resistor.
(To prevent dc build up and switching pop noise).
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