Re: [Homebrew_PCBs] PCB fuse
2010-03-10 by Donald H Locker
I m a fan of PPTC (Polymer Positive Temperature Coefficient) fuses for on-board protection. Quick enough for most purposes, self-resetting after the fault is
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Re: [Homebrew_PCBs] PCB fuse
2010-03-10 by Sz G
Sorry for the inline comments. It wouldn t make any sense otherwise. Hope it does this way :) ... He s not alone. Not sure if anyone cares, but I also think
Re: CIF through-hole rivets
2010-03-10 by sailingto
Phil, I have used rivets very similar to those in the .8mm size. The tool I have is a Panapress with the punches - they work nice indeed. High density would be
Re: [Homebrew_PCBs] Re: PCB fuse
2010-03-10 by Donald H Locker
More like reflashed, perhaps? Donald. Pun completely intended.
Re: PCB fuse
2010-03-10 by awakephd
You left out the next sound that occurred. It began with oh ... :)
Re: PCB fuse
2010-03-10 by awakephd
... I m glad I m not the only one. I had intended to test the board out feeding in power to the logic section from an isolated power source (and that is what I
Re: PCB fuse
2010-03-09 by James
... Been there, done that. *ALWAYS* use an isolation transformer when testing hot chassis equipment. It may save some expensive test gear, or yourself! If
Re: PCB fuse
2010-03-09 by James
... The only place I ve seen a fuse like this is in some compact fluorescent lamps, others use a low ohm fusible resistor for the same purpose. I ve repaired
Re: [Homebrew_PCBs] Re: PCB fuse
2010-03-09 by Paul Mateer
zzzzzzZZZZZZAAAAAPPPPPP!!!!!!!!!!!!!!!!! ... -- Paul Mateer, AA9GG Elan Engineering Corp. www.elanengr.com NAQCC 3123, SKCC 4628, FPQRP 2003
Re: PCB fuse
2010-03-09 by awakephd
I m not sure what the big deal is about printed-on fuses. I ve done that many times -- in fact just the other day, when I made a bone-headed connection on the
Re: [Homebrew_PCBs] PCB fuse
2010-03-09 by Stefan Trethan
You appear to be under the impression that fuses should be replaceable? Usually this is not the case, fuses are there to prevent fire and/or other danger if
CIF through-hole rivets
2010-03-09 by Philip Pemberton
Hi guys, Has anyone had a play with these yet? http://uk.farnell.com/cif/bg9-s/rivets-%C3%B8-0-8mm-qty-100/dp/1783593
Re: [Homebrew_PCBs] PCB fuse
2010-03-09 by David Griffith
... I m curious why someone would want to use such a fuse in the first place. How do you replace it? Are there pads for adding a fuse holder after the PCB
Re: SMD caps - no marking - why?
2010-03-09 by sailingto
It sure would be nice to have the search feature fixed in all the yahoo groups!!! BTW Steve, that is a good circuit and I do thank for offer of more assitance
Re: SMD caps - no marking - why?
2010-03-09 by alienrelics
I wrote it up on Electronics_101. Yahoogroups says they have found and fixed the search problem and have been updating groups with the fix, maybe
Re: [Homebrew_PCBs] PCB fuse
2010-03-09 by Derk Steggewentz
I have seen pcb-trace fuses on a power supply PCB in a Tektronix 577 curve tracer, which I think is from the 70s. So, this technique seems to be around for a
Re: SMD caps - no marking - why?
2010-03-09 by awakephd
Steve, is there a description on your site (or on Electronics-101) about how these circuits work? I think I get it ... maybe ... sorta ...
Re: [Homebrew_PCBs] PCB fuse
2010-03-09 by Stefan Trethan
That s a good calculator, they also have a very good via calculator there. The question is what temperature rise do you calculate for? You mustn t go over the
Re: [Homebrew_PCBs] PCB fuse
2010-03-09 by Paul Mateer
Here s one calculator I found: http://www.circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calculator/ ... -- Paul Mateer, AA9GG Elan Engineering
PCB fuse
2010-03-09 by logicresearch
Hi, I have two photos at of the pcb tracks being used as a fuse. I ve not seen this before, and I thought you
Re: SMD caps - no marking - why?
2010-03-08 by alienrelics
Thanks, that s my site and my designs. FYI, the inductance meter I ve not even breadboarded yet. So let me know how it works out, if you get to it before I do.
Re: SMD caps - no marking - why?
2010-03-08 by alienrelics
Thanks, that s my design. I ve built a few of them and sold them, first one around 1980 but those with 50uA meter movements. That one I built in 1985 with some
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-08 by Greg Kutzbach
My local electronics shop has those little craftsman surplus DMMs. I bought one and they stink. The leads will break with just a few not so careful tugs, the
RE: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-08 by Jim Barnes
Hi, What a good idea! Also, check the other file on this site; it s a very similar inductance meter. That s more interesting to me because I have a way to
Re: SMD caps - no marking - why?
2010-03-08 by sailingto
Steve, that is a very good idea - I m not all that concerned about true accuracy, just so I can tell a .1 from a .01 cap. You mention seeing change as you
Re: SMD caps - no marking - why?
2010-03-08 by alienrelics
A couple of 555 timers makes a surprisingly accurate and sensitive capacitance meter. Uses your DMM in 200mV mode. In the lowest setting, 1mV = 1pF. Measures
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-07 by Stefan Trethan
It doesn t seem to take 4mm test leads. I have some meters with that kind of slot thingy, and never use them. It s just so much more practical for me to use
Re: SMD caps - no marking - why?
2010-03-07 by sailingto
That is a nice looking meter with good specs. I guess it has a function to zero out the leads affect? And really not that much more than what I have - the
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-07 by Adam Seychell
... I ve got one these.
Youtube Video
2010-03-06 by John
Thought of this group as I was watching this! http://www.youtube.com/user/makemagazine#p/u/0/tWnfnt2rNO0
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-06 by lists
In article , ... I use one of these and it works very well. I also have the SMD probe set.
Re: SMD caps - no marking - why?
2010-03-06 by sailingto
Gabor - I have tried both ways, checking caps at the end of 6 inch leads - the AADE meter has compensation to null out length of leads, and I ve also rigged a
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-06 by Stefan Trethan
The AADE meter is not terribly useful for everyday capacitance measurements, it s more for HF component work. Instead use a low frequency meter, like a
Re: [Homebrew_PCBs] Re: SMD caps - no marking - why?
2010-03-06 by Sz G
Hey Ken, Most probably you know exactly what you re doing, so excuse me for this question in advance. I just wanted to ask if you tried to check those little
Re: [Homebrew_PCBs] Tips for improving high speed PCBs from Analog Devices
2010-03-06 by Donald H Locker
Thank you, Steve. I don t have time to search out these gems, and your post is a great one at a great time. Donald.
Re: [Homebrew_PCBs] Fotoresist
2010-03-06 by Alberto Colorado
Oh! Man, that was great! Thank you. I served the first file. That was all I needed but any suggestion is welcome. Thanks again! ... De: Simao Cardoso
Re: SMD caps - no marking - why?
2010-03-06 by sailingto
That was one of the BIG reasons I purchased a L/C meter IIB by AADE (Almost All Digital Electronics) was to check SMD chips. Problem is, it just doesn t do
Re: [Homebrew_PCBs] Fotoresist
2010-03-06 by Simao Cardoso
... Curiosity can be a great thing but in this case practical results are only for chemists, or people with number of equivalent readings as a chemistry
Re: [Homebrew_PCBs] Re: Fotoresist
2010-03-06 by John Coppens
On Sat, 06 Mar 2010 00:28:40 -0000 ... I m no chemist, but this sounds very much as a photographic layer, not a photoresist. I ve read - many years ago - that
Re: Fotoresist
2010-03-06 by James
... It s hard enough to make the commercial stuff work, I wouldn t even consider trying to make the resist myself. Just buy a can of the stuff, or better yet,
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-06 by James
... I ve toyed with picking one of these up on sale in order to hack. Seems somebody must have explored this already though. The software interface they offer
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-06 by James
... Servo motors are not too difficult to drive. Google Elm Chan, talented guy, he s got a simple AVR based servo driver that ought to be capable of running
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-05 by Chris
Steve, Your memory serves you well. I have pulled encoder strips and the read head from several epson printers. They are 720 CPI which matches the 720 DPI
Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Harvey White
... False. (easy to make false, one exception works). I can buy 1206 (roughly 0.120 by 0.060) capacitors in any value from at least 4.7 pf to 1.0 ufd. In
Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Leon Heller
... False! Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Piers Goodhew
I ve seen it said that, for a given circuit board, SMD caps that are the same size and shape are probably the same value. I m not in a position to test this
Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Adam Seychell
... Usually 0402 (1005 metric) resistors don t have markings. And I don t think any manufacture labels their 0201 (0603 metric) resistors. It means investment
Tips for improving high speed PCBs from Analog Devices
2010-03-05 by Steve Greenfield
Webinar and PDF. Also includes an excerpt from an Op Amp book covering high speed PCB design including bypassing.
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-05 by alienrelics
Interesting. Maybe I m remembering some of the incorrectly, but I do recall encoder strips for DC motors moving the heads left and right. Hm.... I guess not
Fotoresist
2010-03-05 by Alberto Colorado
Hi, I m from Colombia, excuse my English. I always wanted to know the formula of fotorresist or something similar to make PCBs. Does anyone know this? Here s