Recent content by 2sb18

i did confuse the issue when i brought up THD since my original post was about clicking noise. sorry about that. even though it's true what sreid is saying about not being able to see the circuit you're trying to analyse, the advice i receive on eng-tips still continues to point me in the right...

Thanks guys for the excellent advice. As for itsmoked's comment that buffers won't help, I would like a second opinion on that. I found a maxim application note (AN730) that states that the THD of a multiplexer is roughly: THD = Rflat(ON) / Rload Since an op amp buffer would increase the...

Thanks for all your help guys, All I need is just a rough estimate. I'm going to be taking a design into a lab to have some tests done, I just need a reference point so I know how far off from the ideal I am. Thanks, Steve.

Hi again, If I have one buffer with a THD of .3% feeding another buffer with a THD of .6%, can I multiply the two numbers together to get a good estimate of the total THD? ie 1.003*1.006=1.009 (.9% THD) Thanks, Steve.

Hi, I'm building a system that has analog and digital circuitry. I had two questions: 1) The system includes high end audio. Is using a 7805/7905 combination for the power supply a bad idea? Are they good enough? 2) Should I seperate the digital power from the analog power? As in, should I...

Thanks BrianG, Yes, now I am going to be putting op amp buffers before and after each of the switches. That should clean things up a bit. S.

Hi guys/gals, I'm making a signal router for musicians. I'm using analog multiplexers (MAX307/MAX308) instead of relays. I'm getting clicking noises when I switch between different routing schemes. Does anyone have any suggestions as to how I could reduce these. Thanks, Steve

Thanks for the help guys, I think what I'll do is treat the signal grounds as another signal to be switched. I don't have the money for adding isolation tranformers to every send/receive (unless someone has a good source). I'll use isolated jacks and the signal grounds of the effects will never...

Hi, I'm constructing an audio routing device that a musician on stage would use. They plug their guitar/keyboard/musical saw into one end of it, their amp into the other, and there are 8 send/returns that they plug their "effects" into. My question is in regard to grounding. The system...