Search found 326 matches

by Sambuchi
Tue Dec 29, 2009 6:37 am
Forum: General Discussion
Topic: Creating Magnets
Replies: 9
Views: 1200

Re: Creating Magnets

In general bring a piece of iron up to the critical temperature in a magnetic field and it will become magnetic. How magnetic depends on the material properties and alloy of the iron. Lightning is a perfectly reasonable way to create high temperatures and a magnetic field inducing large current flo...
by Sambuchi
Tue Dec 22, 2009 8:24 pm
Forum: General Discussion
Topic: Creating Magnets
Replies: 9
Views: 1200

Creating Magnets

I was wondering how some of the first magnets were made. I'm not interested in electro magnets, using other magnets to make magnets, etc. I am more interested in... Lodestones "natural" but still wonder how they get their properties... Browsing the internet, found a post about Creating Magnets by Ta...
by Sambuchi
Fri Nov 13, 2009 7:38 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Steve! Found this on the web, might be useful. http://www.murata-ps.com/data/apnotes/dcan-31.pdf Steve G. http://2.bp.blogspot.com/_53oMB4-fxXM/SVZZdJntnPI/AAAAAAAAAAM/vXEtrdBFtqI/s1600-R/cookie.gif This solved my problem! Thou I tried this before I read your post... :D My board was experiencing gro...
by Sambuchi
Wed Nov 11, 2009 12:43 pm
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Hello Mr. Al Yes it is a Buck. How can it tell if its the load. The board works with a external power supply. I am noticing noise in the Mhz range... what do you think of this calculation... http://www.wa4dsy.net/cgi-bin/lc_filter?FilterResponse=Lowpass&poles=3&cutoff=200&funits=MHZ&Z=466 those caps...
by Sambuchi
Wed Nov 11, 2009 9:13 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Well this power output IS a problem that I will have to fix.

I'll check the period...
by Sambuchi
Wed Nov 11, 2009 7:49 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Hooking up a external load to the DC2DC I see lots of noise on the output. More than what you see in the photo above.
by Sambuchi
Wed Nov 11, 2009 5:23 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

I will answer what I can and get more info later... 67Mhz-74mv p-p ripple. What is this supply driving-a high speed clock? The load drives several processors running at 30,25,8Mz *** I can put a probe on the converter and see the same AC signal Does that period relate to any thing in the load circui...
by Sambuchi
Tue Nov 10, 2009 4:19 pm
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Whoever can solve this gets a cookie... This is my output of my Isolated DC to DC converter. http://i424.photobucket.com/albums/pp326/sambuchi/tek00021.png?t=1257898559 I have the converter wrapped in M3 tape. I am not having much luck killing this noise. I need to to go for my amplifier circuits on...
by Sambuchi
Tue Nov 10, 2009 1:35 pm
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

I am using the following DC to DC converter. http://www.newark.com/artesyn/bxa3-24s05j/dc-dc-converter/dp/71K1012?Ntt=bxa3-24s05j I am learning about EN55022... I have 3 different dc to dc converters the one above is giving me the best results. I still have a noise issue but its not as bad. Playing ...
by Sambuchi
Wed Nov 04, 2009 11:51 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Re: Ripple Cancellation

Yeah.... I've tried to use different value caps and no luck cleaning this up. I found this nice site... http://www.wa4dsy.net/filter/hp_lp_filter.html I have some sensitive circuits on board that cant handle the output of this dc to dc converter. and using an external power supply the board works gr...
by Sambuchi
Wed Nov 04, 2009 9:33 am
Forum: General Discussion
Topic: Ripple Cancellation
Replies: 29
Views: 3125

Ripple Cancellation

I have a 5V power supply that draws .06A

There is a 15mV 2.5 MHz AC ripple on this supply voltage that I want to get rid of.

What can I do here?
by Sambuchi
Mon Oct 12, 2009 4:23 am
Forum: General Discussion
Topic: Pulse Generation
Replies: 7
Views: 943

Re: Pulse Generation

I will need the pulse to be 50ns unfortunately. I will have some time this week to review all of this great data and then make a decision on what is practical for my testing needs.

Thanks again everyone.
by Sambuchi
Fri Oct 09, 2009 9:13 am
Forum: General Discussion
Topic: PLD Starter Kits
Replies: 0
Views: 838

PLD Starter Kits

Hello all. I was wondering if anyone here uses PLD's and if so what are some cheap ways to get started with them.

I would love to hear of an in system programmable chip & compiler & program tool for under 50.00!
by Sambuchi
Fri Oct 09, 2009 9:09 am
Forum: General Discussion
Topic: Pulse Generation
Replies: 7
Views: 943

Re: Pulse Generation

:D Thanks for the input everyone. This circuit will be used to test an amp circuit. For the accuracy question I would say it would have to be fairly accurate. I am testing the threshold of the data transmission and would like to meet the spec as much as possible. Bob & Robert, thanks for the great i...