Just a few questions....
how many steps does it have?
does it use a logarithmic resistor ladder? or just something like rotary stepped-attenuator with relays instead?
what relays are you using? (that thing looks really small....)
what are you using to control the relays? standard logic or microcontroller?
it that a pot or rotary encoder behind that gold knob?
Thanks! because I'm thinking of building one too...
The attenuator is controlled with a single linear pot behind that glorious knob .
The pot is then read by the microcontroller's ADC to control the relays. The resistor set is logarithmic.
There are 128 steps and two input channels. So I used 7 relays for the ladder and one more relay for channel selector.
The relays are indeed small. The one I used are made by American Zettler.
What do you want to use your attenuator with? Any plans yet?
Edited by earfanatic - 10/26/12 at 3:06am