Valab 23 step attenuator musings

[Doc B]

signal level doesn't really correlate to current, it's about potential, i.e., voltage. That's what changes when the signal gets shunted. It's the level of the fluid that goes down. How much current flows when it goes down is pretty immaterial because it flows fast enough to change as fast as you turn the knob.

 

[Joshewah]

grausch, I've also received an attenuator with an upside down PCB.

If you wouldn't mind, would you be able to indicate on your first photo what ended up being L in, L out, R in and R out.

Mine is wired exactly like yours with the two white and black wires and the white and yellow striped wire.

I'm pretty sure I already have everything figured out with tracing the leads, but I'd just like some double verification. Thanks.

 

[grausch]

I would recommend doing PB's check and just marking them as he explained. Since the PCB is upside down, I was unsure if the rest of the attentuator was correct, so PB's method can helo you identify that.

On my attentuator, the top two were input, middle two ground and bottom two output. Left and right does not matter, just make sure the use the same side for each of the channels.