Search found 1799 matches

by CeaSaR
Thu Dec 04, 2008 10:40 am
Forum: General Discussion
Topic: Capacitance spec for resistors
Replies: 17
Views: 5049

Thanks Bigglez, I completely forgot about plate size. Another :headslap:! Just being a hobbyist, I look to the books, the web and professionals, such as yourself, to keep me on the straight and narrow regarding electronics rules and laws. While I remember a number of things, time spent between readi...
by CeaSaR
Thu Dec 04, 2008 10:30 am
Forum: General Discussion
Topic: Funny forum bug
Replies: 10
Views: 3633

Well, I was finally able to close a "posted" window before it redirected to the actual forum post and it did none of what you said yours does. I'm currently using IE6 on this computer, while your OP leads me to believe you are using IE7 ("tabs"). Has this happened to anyone else ...
by CeaSaR
Thu Dec 04, 2008 10:23 am
Forum: General Discussion
Topic: battery powered off shelf timer.
Replies: 10
Views: 3750

I'm glad you found an off the shelf solution. I was going to suggest a
project by bodgy, found on his page. I think this would have worked for
your Xmas light setup, but I don't know how much free time you have for
a PIC project. Maybe for next year.

CeaSaR
by CeaSaR
Thu Dec 04, 2008 10:07 am
Forum: General Discussion
Topic: Capacitance spec for resistors
Replies: 17
Views: 5049

Explained that way, it makes absolute sense. For what is a capacitor but 2 plates separated by some sort of dielectric. And what determines the capacitance? The type of dielectric combined with the distance between the plates. :headslap: So simple! I know, that is oversimplified, but basically that'...
by CeaSaR
Thu Dec 04, 2008 8:07 am
Forum: General Discussion
Topic: Member's home pages
Replies: 6
Views: 3114

Member's home pages

I am posting this under General as it has nothing specific to do with computers or programming. With that out of the way... I was surfing the memberlist the other day checking out member's home pages to see what interests they had. Many of the links produce 404's, and to those who had Hometown.AOL p...
by CeaSaR
Thu Dec 04, 2008 7:37 am
Forum: General Discussion
Topic: Funny forum bug
Replies: 10
Views: 3633

Hacklesup, I've never experienced this particular behavior, but then I usually click either of the links provided (go to the Forums or see your Post ). I use a either IE6 or IE7 for my internet perusal / enjoyment / annoyance, as the case may be, depending on what computer I am on. I remember readin...
by CeaSaR
Tue Dec 02, 2008 8:28 pm
Forum: General Discussion
Topic: Big Ear
Replies: 9
Views: 3782

Don't assume they know of this problem or read this forum. Actually, someone over there actually does read and post here. Yes, he is the website guy, but still a part of the team. Team: Larry Lemieux - publisher@nutsvolts.com - Publisher Robin Lemieux - display@nutsvolts.com - Assoc. Pub./VP Sales/...
by CeaSaR
Tue Dec 02, 2008 4:23 pm
Forum: General Discussion
Topic: Big Ear
Replies: 9
Views: 3782

It seems that this is a "kit only" article, available from the N & V store. This is a poorly documented article, stating only 4 components: TL071, LM386, R9 = 10 ohms, D3 is a 5V zener. The rest, who knows? Though the hardware aspects are described well, all the screws, standoffs etc. ...
by CeaSaR
Tue Dec 02, 2008 2:40 pm
Forum: General Discussion
Topic: AC noise in audio ckt
Replies: 16
Views: 7406

No problem rolerbe, I gathered that from your previous posts. BTW, it
was late last night when I posted about the second filter cap and I should
have said circuit ground instead of signal ground, which, in this case, is
one and the same.

CeaSaR
by CeaSaR
Mon Dec 01, 2008 7:19 pm
Forum: General Discussion
Topic: AC noise in audio ckt
Replies: 16
Views: 7406

I just had a "Ding fries are done!" moment. The only thing connecting the power supply to the signal ground is C8. Shouldn't there be another cap of the same size going from signal ground to V-, oriented with + at signal ground and - at V-? You have filtering on the + supply but not the - ...
by CeaSaR
Mon Dec 01, 2008 7:11 pm
Forum: General Discussion
Topic: AC noise in audio ckt
Replies: 16
Views: 7406

I guess what I should do (after eliminating the rogue AC input) is set fixed gains on the board for both stages that are high enough, then use the ouput pots to control output levels. Either that or use shielded cable for the offboard pots and shield the enclosure once you have the circuit finished...
by CeaSaR
Sun Nov 30, 2008 4:01 pm
Forum: General Discussion
Topic: AC noise in audio ckt
Replies: 16
Views: 7406

BTW, do you have a guitar cable plugged in when you have this artifact?
If you do, unplug the cable and check again. If the artifact is gone, you
have a grounding problem.

CeaSaR
by CeaSaR
Sun Nov 30, 2008 3:37 pm
Forum: General Discussion
Topic: AC noise in audio ckt
Replies: 16
Views: 7406

At first glance, C8 is backwards. Re-orient so that + is towards V+ from U2. Also, check the orientation of the 10 uF cap at R5 as it also appears backwards. If that doesn't work... What is the power supply? If it is from a wall source, the ripple may be coming from there. To verify, replace the pow...
by CeaSaR
Sun Nov 30, 2008 2:10 pm
Forum: General Discussion
Topic: TV REMOTE CONTROL IR TESTER
Replies: 16
Views: 7727

If you have a video camera or digital still camera, point the remote at the lens. Video / digital cameras are sensitive to infrared and they will show up even on the miniscreen on the device. Cell (camera) phones should be included in this as they are digital also. It is the CCD or CMOS sensor used ...
by CeaSaR
Thu Nov 27, 2008 1:18 pm
Forum: General Discussion
Topic: Happy Thanksgiving Everyone
Replies: 3
Views: 2111

Happy turkey day Tom, and everyone else!

CeaSaR