6-bit Relay Ladder attenuators preamp w Sub out

[chchyong89]

I am making a simple preamp with
-6 bit relay Volume attenuator
-Class A Line driver output stage
-2 x stereo selectable inputs
-1 x Stereo subout @ fixed 85hz linkwitz Riley low pass
-rollable opamps for filters.
-Apple remote controls
-0 to +12dB Sub Gain.
-chili red 1602 display

pack with a beautiful chili red Chassis. 😀


Target for two large 18inch UM18-22 @ 14cf sealed box.

 

[diyralf]

Nice. Do you have any problems with noise due to switching PSU?

 

[chchyong89]

attached with the noisefloor at maximum volume. Slightly higher than reading ground. I am using 4558 now.

There is no other regulators after the CLC. 😱