Line / mic switching

[analogical]

removed initial post, reworking line drawing (I must have been sleepwalking when I started)


Would you kind folks mind taking a look at this, and advise?
I'd like to know if there is anything I should be worrying about, going straight from the pre to the  DIY sontec, or any other issues so far. I think the DI's soft start will cancel out the pop's from switching over to line in.

Thanks in advance for your replies.
-Don

 

[Mark Burnley]

Try it and see!

It'd be better if you kept the active DI powered all the time, and then just allowed the relay to switch the low-level signal, but if you need to power up both at the same time, just test it out and see how much >pop< you get at switch on.

I'd put a backwards connected rectifier diode e.g. 1N4001 across the relay coil to kill off any back-emf generated by the coil as it switches off. Also check you NO/NC connections when you wire it up- makes sense to have the standard mic input as the NC inputs. But it's easy to mis-wire!

Mark

 

[analogical]

I've started making a true bypass for a gssl, it was at that point I learned about the need for the diode protection, thanks for mentioning that Mark!
I've taken it a step further and added a cap/resistor to ramp the Vin.