Isolated inputs

[Bernardduur]

Hey all!

I was building this small mixer; it must switch between two sources of signal, both left as right. As the two sources are independent I need to isolate the inputs.

I saw the A/B at GEOFEX using trafo's for isolating

Can I reverse this? Can I feed a signal into a trafo and next feeding that into a small inverting mixer? Do I need to add anything else to this idea???

[aron]

>I was building this small mixer; it must switch between two sources of signal, both left as right. As the two sources are independent I need to isolate the inputs.

I must be missing something. Why not use a switch?

[Bernardduur]

I also use a switch to switch the various mixer inputs to ground

This way I can mix in the various lines

The idea would be this trafo into this schematic

I'm kinda new to trafo's so please correct me if I do weird things. Both signal generators will have an output of 1V (I use the mixer on +9 as -9V) so I have 4 inputs and 2 outputs. I think the running through a trafo will cause a volume drop so I cure that in one of the inverting stages of the mixer

[Bernardduur]

shameless bump here