Search found 105 matches

by Volter
Wed Jan 28, 2009 11:56 am
Forum: General Discussion
Topic: same I but different V
Replies: 11
Views: 1294

:shock:
SO, you want me to go thru all those CALCULATIONS and all what it takes to come up with the design! Well, I guess I do not have much choice and so I will plunge into sometimes to night.
Thanks.
:shock:
by Volter
Wed Jan 28, 2009 10:23 am
Forum: General Discussion
Topic: same I but different V
Replies: 11
Views: 1294

Thank you Bigglez, that is what I am looking for! My apologies for not being clear, that happens often when I do not know too many answers.
I was considering a Buck circuit to build this driver circuit. Would you suggest a design circuit to fit your recommendation?
Thanks!
by Volter
Wed Jan 28, 2009 6:41 am
Forum: General Discussion
Topic: same I but different V
Replies: 11
Views: 1294

For Bob, is it OK to verify what I might know? Also, I got into software engineering and so haven’t done any EET for quite a time. That is why I kind of making sure I am not doing something I should not do. I might have more similar questions just to make sure I destroy the least of what I make! O...
by Volter
Tue Jan 27, 2009 5:59 pm
Forum: General Discussion
Topic: same I but different V
Replies: 11
Views: 1294

same I but different V

Hi,
If I got LEDs in series of different V (3V,3V,3V,2V,2V) values but same I (500mA) will they get the same current through?
Thanks.
by Volter
Thu Jan 15, 2009 7:05 am
Forum: Computer Programming
Topic: QTLP690C-Y - what data is that?
Replies: 2
Views: 1167

The issue here is this: To create another component in LTspice is nothing complex and one can create as many as he wants BUT the new component needs to be identified by its values that relate to the new component. If I create new component I need to make sure that it behaves to its specifications an...
by Volter
Wed Jan 14, 2009 6:17 pm
Forum: Computer Programming
Topic: QTLP690C-Y - what data is that?
Replies: 2
Views: 1167

QTLP690C-Y - what data is that?

I pulled out this data from LTspice \lib\cmp\standard.dio. Would someone know what the values below represent! .model QTLP690C D(Is=1e-22 Rs=6 N=1.5 Cjo=50p Iave=160m Vpk=5 mfg=Fairchild type=LED) QTLP690C-Y.pdf = data sheet .model QTLP690C D( Is=1e-22 = ? Rs=6 = ? N=1.5 = ? Cjo=50p = ? Iave=160m = ...
by Volter
Wed Jan 14, 2009 10:46 am
Forum: Computer Programming
Topic: *.lib and *.olb into spice, how?
Replies: 6
Views: 4373

OK, I created the component but it seems it does not finds its *.lib file even I do specify it. Do I need to edit any files in the “\cmpâ€
by Volter
Wed Jan 14, 2009 7:37 am
Forum: Computer Programming
Topic: *.lib and *.olb into spice, how?
Replies: 6
Views: 4373

*.lib and *.olb into spice, how?

I downloaded some Pspice files with these extensions: *.lib and *.olb!? How do I get them imported into LTspice?
Would someone have any idea what to do with them?
Thanks.
:sad:
by Volter
Wed Jan 14, 2009 7:08 am
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

Judging from the content I am surprised to hear that there are not too many involved! Nuts and Volts is one of the “BESTâ€
by Volter
Tue Jan 13, 2009 4:44 pm
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

Because you know so much!!! You knew where I came from the first time and this site IS about N and V!
by Volter
Tue Jan 13, 2009 12:05 pm
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

Too bad I did not know what other circuits you might present and so I do not have the Schotky NANDs and MOSFETs so that will have to wait a bit until I get those. When I got the parts for the project there were no CD4093, Cap 1uF, and transistor 2N700 as it shows in the parts list in the January is...
by Volter
Tue Jan 13, 2009 6:02 am
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

Yes, it works now. At first I thought it might be the resistance that I got, the 2 100Kohm might cause the issue since I had to put some R in series getting 90K and 94K since I did not have any 100Ks but it should handle some tolerance for my purpose. Too bad I did not know what other circuits you m...
by Volter
Mon Jan 12, 2009 6:49 pm
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

So, it is the drawing that does not mach the PCB! I finally unwired it and found out that the S4 terminals are switched. If would I notice that right away I could switch just one wire but since I took the wires off I had to reconnect all, that’s fine, it works now. :grin:
Thanks!
by Volter
Mon Jan 12, 2009 6:38 pm
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

I found the problem. It is the PCB trace layout that involves the jumper part. Instead the jumper going from S3-j to S4-j it jumps directly to S4. I hope this description helps or if you accept JPG or GIF image I can send you that. :eek: I can retrace that, luckily it is at the bottom so no one will...
by Volter
Mon Jan 12, 2009 7:40 am
Forum: Projects & Kits
Topic: digital circuit pg-46
Replies: 15
Views: 4605

digital circuit pg-46

I built the Digital Circuit, figure 11 on pg-46 but SET and RESET! One LED stays on while the other comes on at the push of button but that’s it!? What am I missing?
Thanks.