thec
New Member
Hi. First post to this message board which looks promising! I'll make sure to bookark it, great work!
I'm thinking of building myself a mixer. But as a digital nerd I am (computer programming is my main interest) I'm not too familiar with the analog circuts. I did go a electric education in secondary upper school but can't remember most of it
I'm building a digital mixer... there is a digital potentiometer out there which I'll be using for this purpose. Controlled by the computer (of course).
However, the basic mixing circut is:
**broken link removed**
Yes, this is a simple volume controller, with a 47k variable resistor (in my case a digital one but makes no difference). So far soo god.
When connecting a bunch of these and try to blend the signal (doh, building a mixer), we get into a problem. Have a look at the following image:
**broken link removed**
The output may need an amplifier I've been told, to make up for some loss of signal, I'm not sure what is meant by that, but I guess you could tell me, but that's not the real question.
The question of the week: The ? in the post. The blending. How is it done without signal A going in reverse to signal B,C or D? I mean, if A and B potentiometers are set to 50%, wouldn't like 25% of the signal from A go to B's input, and 25% of B blend into A's input?
A diod solution is of course out of the question, so my question is, how do I solve this and DO I solve it or does every output (CD,DVD,soundcard(PC) etc) have some kind of blocking of reverse audio? I wouldn't like the fact that signals are crossing my system all over.
So.. any ideas? Thanks for reading, now reply ;-)
//Albert "thec" Sandberg
I'm thinking of building myself a mixer. But as a digital nerd I am (computer programming is my main interest) I'm not too familiar with the analog circuts. I did go a electric education in secondary upper school but can't remember most of it
I'm building a digital mixer... there is a digital potentiometer out there which I'll be using for this purpose. Controlled by the computer (of course).
However, the basic mixing circut is:
**broken link removed**
Yes, this is a simple volume controller, with a 47k variable resistor (in my case a digital one but makes no difference). So far soo god.
When connecting a bunch of these and try to blend the signal (doh, building a mixer), we get into a problem. Have a look at the following image:
**broken link removed**
The output may need an amplifier I've been told, to make up for some loss of signal, I'm not sure what is meant by that, but I guess you could tell me, but that's not the real question.
The question of the week: The ? in the post. The blending. How is it done without signal A going in reverse to signal B,C or D? I mean, if A and B potentiometers are set to 50%, wouldn't like 25% of the signal from A go to B's input, and 25% of B blend into A's input?
A diod solution is of course out of the question, so my question is, how do I solve this and DO I solve it or does every output (CD,DVD,soundcard(PC) etc) have some kind of blocking of reverse audio? I wouldn't like the fact that signals are crossing my system all over.
So.. any ideas? Thanks for reading, now reply ;-)
//Albert "thec" Sandberg