Hi,
I would like to connect the k4003 to the k8055 - creating a USB controlled amplifier. I hope to get the analogue channels on the k8055 to control the volume on the k4003. The trouble is, the k8055 produces an electrical signal (0…5V) , but that would not work in place of a potentiometer for the volume control.
[color=red]Does anyone know how I could connect the K8055 analogue channels to the volume input on the k4003?[/color]
This is quite important so I hope there is a reply!
fish
Get a general purpose NPN transistor and hook the anologue output from the USB interface up to base and collector (ov to collector and 5v to the base) and then the audio input gnd into the amp gnd and the input + to the collector and then a wire from the emitter to the input + on the amp
I think that would create half wave rectification though so to get the full signal you would need to use an NPN and a PNP transistor
Sorry, but the above will definately not work.
You might want to check the net. There used to be an IC available which could be described as a voltage controlled potentiometer. Please don’t ask for references or URL’s , this is just a hint, I don’t know more on this subject.
Nevermind then 
How come it won’t work? as i was planning on doing a similar thing…
Sorry, explaining theory is beyond the goal of this forum.
I wouldn’t say “definately not work” becuase i just tried it out of curiosity with my mp3 player going through an NPN transistor and it does seem to work and i can change the volume based on the anologue output but there does seem to be a buz but im not sure whether that is becuase i am holing the wires onto a jack plug.
:idea: Oh i see… is it becuase it is a stero amp cos i only tried it with a mono signal going into a single channel in my mixing desk?
Would it be possible for you to link me to a webpage that does explain the problems behind it or just tell me what the problem would be and i can go do some research myself ?
Thanks anyway 