output hum humdrum
output hum humdrum
(OP)
Howdy:
Looking for a little information on the increasing of the S/N. I have a portable electret microphone feeding a preamp and then to an adio output power amp, LM4860. My problem is as the power output of LM4860 goes up the voltage regulator LM7805 shows a ripple of the increased demand of the power out put. As the power goes up the ripple becomes amplified and can cause hum in the background or it gets large enough to oscilate the whole system. I've tried to place the preamps on a seperate Lm7805 from the single battery supply helped only marginally. Looking to create a silent background operation from the headphones while their is signal and no signal present at the mic. Any help out there would be appeciated.
Sincerely;
Cy Drollinger
Looking for a little information on the increasing of the S/N. I have a portable electret microphone feeding a preamp and then to an adio output power amp, LM4860. My problem is as the power output of LM4860 goes up the voltage regulator LM7805 shows a ripple of the increased demand of the power out put. As the power goes up the ripple becomes amplified and can cause hum in the background or it gets large enough to oscilate the whole system. I've tried to place the preamps on a seperate Lm7805 from the single battery supply helped only marginally. Looking to create a silent background operation from the headphones while their is signal and no signal present at the mic. Any help out there would be appeciated.
Sincerely;
Cy Drollinger





RE: output hum humdrum
A.Rash BScEE & PE
a_rash@bigfoot.com
RE: output hum humdrum
I thought this would be a slam dunk for the very resource laden experts we have in this forum. I could list some handles of those I have read excellent responses from, but I would not want to forget anyone. I am inquiring on excluding an electrically generated noise from my audio output. I am guessing this is very possible for a good EE.
Thanks;
Cy Drollinger
RE: output hum humdrum
http://www.thomasregister.com
and type Filters: Electronic under Product or Service which will return 198 companies to contact for right filter for your project.