Re: circuit board drilling question
2013-01-03 by bebx2000
Charlie, The pinhole tends to become obscure after a few holes, but I just blow the debris away with a can of air. The real drawback to this setup is going out
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RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by Jeff Heiss
What is plasma eating? Jeff _____ From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of brane2 Sent: Wednesday, January 02,
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by Missouri Guy
Not to extend/stray the thread, but just FYI....and my 2-cent worth below. Long ago there was a discussion during a coffee break down at work, where a QC guy
Re: [Homebrew_PCBs] Re: circuit board drilling question
2013-01-03 by Missouri Guy
Neat idea, but I gotta ask...does the light down below collect any dust from the drilling or does a vacuum pretty much take care of that. Charlie On Thu, 03
RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by Boman33
The problem with the eyelets was that they were tubular rivets. They solder on the bottom and filled with solder. Unfortunately it often did not flow over
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by brane2
Dne 02. 01. 2013 23:29, pis(e Charles R. Patton: ... Monitoring the current through exploding wire might give you a clue. Also, plasma eating might
Re: circuit board drilling question
2013-01-03 by bebx2000
Rick, I think you misinterpreted the arrangement. The drilling is down from the top, but the light is shining up through the bottom of the board. The board is
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by Bob Macklin
I was an EE for over 40 years. And I remember the brass eyelet problem well. But I think trying to simulate plated through holes on home made PCB is going way
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-03 by David Griffith
... If the exploding wire trick works to plate a hole, what happens to the exploded metal that was above and below the board? Does it adhere somewhere or does
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Charles R Patton
My take is that is for both. A bit of history that weighs on my opinion. Some 40 or 50 years ago, one method of doing two layer boards was the use of brass
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Missouri Guy
Warnings well noted!! BTW gents, a teenager in KS was electrocuted recently. He was working on a computer power supply, UNPLUGGED from power and apparently
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Charles R. Patton
My take is that is for both. A bit of history that weighs on my opinion. Some 40 or 50 years ago, one method of doing two layer boards was the use of brass
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Bob Macklin
What is the purpose of this discussion? Is this for two layer boards or boards with more than two layers? Bob Macklin K5MYJ Seattle, Wa. Real Radios Glow In
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Stefan Trethan
There are far more gruesome images where rings got caught in moving machinery, don t wear them when you work on either. I like the idea with the explosives
Re: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Harvey White
... At that price, it s certainly out of my range. Let s see (prices in USD), TV camera, 25$, stand (hot air from Weller, base and arm, 30$, ball bearing slide
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Charles R Patton
Found/2/2013 1,_._,___ Found a scholarly paper with photos on wedding ring burns from 12 and 24 batteries :
Re: plating holes with an exploding wire
2013-01-02 by AlienRelics
Low ESR is part of the equation. I could suggest some of their very low ESR 50V caps, but they are similar in price. Just a bit safer regarding accidental
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Charles R Patton
Re wire in water being cooled . Actually the contrary is what happens. The speed with which the pulse happens is much faster than the conduction of heat so
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Bob Macklin
If you want to melt a wire use a 28V 600A aircraft battery! Ask me how I know! Bob Macklin K5MYJ Seattle, Wa. Real Radios Glow In The Dark ... From: brane212
Re: plating holes with an exploding wire
2013-01-02 by brane212
... Not neccessarily. Your example of wire exploding inside water needs much more energy due to water acting as coolant Also exploding might be done in many
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Charles R Patton
A few other comments: First: 200uF @ 2KVusing Watt-secs or Joules = 1/2 (CV^2) gives 200 Watt-secs.That seems like a lot of heat in a 10 mill dia 62 mill long
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Mark Lerman
Norm, you are 100% correct - this is dangerous, and if you don t know exactly what you are doing, you shouldn t do it. A couple of years ago I was working with
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Norm
... At the risk of offending some on this list, be aware: 800 uf at 500 v can be a lethal combination! 200 uf at 2000 v is absolutely LETHAL - and you only
RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Mark Lerman
Digikey has them, though they are $16,27 USD each. 820uf at 500 VDC
RE: [Homebrew_PCBs] Re: Nuwave PIC
2013-01-02 by Mark Lerman
I ve used a toaster oven with a controller and found, especially with the small boards I generally make, that it can overheat the board. This is due to not
RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Jeff Heiss
Can you suggest a place where 800uF, 500v caps can be found? ... From: Mark Lerman Sent: Wednesday, January 02, 2013 10:04 AM To:
RE: [Homebrew_PCBs] Re: Nuwave PIC
2013-01-02 by MIKE DURKIN
Then I guess it comes down to what you have on hand compared to the price of buying something.... I got my toaster oven local for less than 20$ used ...
Re: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Malcolm Parker-Lisberg
Drilling from below presents no problems. I have used the professional version from Megauk, see half way down the page:
RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Mark Lerman
Shouldn t be a problem - you could use electrolytic caps in series and parallel combinations, eg 4 x 800 uf 500 V caps in series = 200 uf at 2000 V.
Re: Nuwave PIC
2013-01-02 by KalleP
Interesting gadgets, too expensive still for what is inside. I have pondered making may own but not much into cooking. Bearing heaters are distant cousins,
RE: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Rick Sparber
Harvey, By drilling from above I just hold the board steady with one hand. I do use two hands to move it into position because I m not all that coordinated.
Re: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Harvey White
... So can I. The approach was to use a vacuum, but there are mechanical problems, as in not enough suction at the moment. I have more mechanical work to
RE: [Homebrew_PCBs] Re: circuit board drilling question
2013-01-02 by Rick Sparber
Baxter, Our approaches are rather different. I m hoping to shine light through the board so the pad feature is clearly outlined. I figure that would be more
RE: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Rick Sparber
I can see how holding the board down with the drill coming up through it would be a problem. Rick ... From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] Re: circuit board drilling question
2013-01-02 by Rick Sparber
Jeff, Yup. That is the way they are designed. So I hope to see a well defined bright spot as my target. Rick ... From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] Re: circuit board drilling question
2013-01-02 by Jeff Heiss
The pads will need a center hole etched so the light will go through the board? Jeff ... From: bebx2000 Sent: Tuesday, January 01, 2013
Re: [Homebrew_PCBs] Re: Michael's "Green Film" provokes thought
2013-01-02 by Paul
Good clear explanation of the whole process here: http://cms.diodenring.de/de/electronic/mikrocontroller/95-pcb-diy Paul ... [Non-text portions of this message
Re: circuit board drilling question
2013-01-02 by bebx2000
I use a laser pointer mounted horizontally in a project box. The beam is directed to a 45 deg. mirror to turn the beam upward through a hole in the top of the
Re: [Homebrew_PCBs] circuit board drilling question
2013-01-02 by Harvey White
... I ve played with a TV camera pointing up (in my case, down) at the PC board with a pair of cross hairs on the monitor. The drill moves upwards. Main
Re: Michael's "Green Film" provokes thought
2013-01-02 by bebx2000
I bought some some solder mask from an eBay seller in England several months ago and it works just fine. It takes a little practice to laminate it with out
circuit board drilling question
2013-01-02 by Rick Sparber
Has anyone played with putting a high intensity LED pointing up through the drill press table so it would be easier to see the circuit board land before
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Bob Macklin
Someone is having a problem here. Two 200uf 100V capacitors in series give you a 100uf 200V capacitor. The capacitance divides by 2, the voltage multiplies by
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Harvey White
... Actually, no, you end up with a 10uf at 2000 volt capacitor, and you have to hope that the leakages balance, because if they don t, then you have unequal
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Norm
... Sorry, it doesn t work that way. 20 200 uf caps in series results in a 10 uf 2000v cap. Resistors add in series, caps add in parallel. Norm W6NIM
Re: Michael's "Green Film" provokes thought
2013-01-02 by tda7000
The video may not be great but the information is all there if you listen. I understand some people may not want to, but I had no big issues with it. Certainly
File - monthly.txt
2013-01-02 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
Re: [Homebrew_PCBs] Re: Michael's "Green Film" provokes thought
2013-01-02 by Missouri Guy
... FWIW.... I ve been using a FAUX solder mask. :D) After etching the board and cleaning it thoroughly, I spray it with Testor s all purpose spray enamel,
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-02 by Kevin Impson
Hi, Just get 20 200uF 100V capacitors and wire them in series. You then have a 200uF 2000V capacitor. Check Ebay... lots of options Kevin I.
Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
2013-01-01 by Donald H Locker
The peeling copper may well be the result of chemical deposition before electrical deposition begins. Try turning on the electricity before immersing the
Re: [Homebrew_PCBs] Re: Michael's "Green Film" provokes thought
2013-01-01 by John Anhalt
I realize a solder mask can do that. But didn t see the your tube producer mention that the board was etched first, then was treated with the solder mask. I