I read last night about shunting a balanced signal rather than series resistance. What kind of value is best? My output is referenced to +4dbu. Can I use 20k pot straight across hot and cold? I am not worrie about perfect attenuation. more of a utility for when I need to answer phone or for when booting machines. My main concern is whether I can do damage by shunting like that. I asked about 20k because it is the only ganged pot I have on hand
Thanks
Thanks
Balanced attenuator
Hi,
you need an inline resistor on both the hot and cold feeds.
Connect your pot across the downstream ends of the inline resistors. I think they call this a Pi attenuator.
You can design in a fixed amount of cut by selecting either the inline or the bypass values.
You could use a switched attenuator 2 pole 6 way is available as a rotary - straight through & then -6db, -12db, etc... -80db.
Remember to keep the inline values above the minimum resistance required by the source.
If you want constant impedance (seen by the source) I think you may need a 4 pole 3 way giving strt thro' -20db, -40db.
All of these solutions will probably increase the source resistance seen by the receiver so you need to locate the attenuator very close to the receiver.
Hi,
you need an inline resistor on both the hot and cold feeds.
Connect your pot across the downstream ends of the inline resistors. I think they call this a Pi attenuator.
You can design in a fixed amount of cut by selecting either the inline or the bypass values.
You could use a switched attenuator 2 pole 6 way is available as a rotary - straight through & then -6db, -12db, etc... -80db.
Remember to keep the inline values above the minimum resistance required by the source.
If you want constant impedance (seen by the source) I think you may need a 4 pole 3 way giving strt thro' -20db, -40db.
All of these solutions will probably increase the source resistance seen by the receiver so you need to locate the attenuator very close to the receiver.
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