Re: [Homebrew_PCBs] Re: Bridge rectifier
2012-07-20 by Paul
Hi Kevin Which amplifier is it? I have a few old ARRL Handbooks here. Will have to dig them out but happy to check to see if I have one with the amp in, They
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Re: Bridge rectifier
2012-07-20 by Jim
http://www.ebay.com/itm/ARRL-Handbook-1982-59th-Edition-/261068074441
Re: [Homebrew_PCBs] Re: Bridge rectifier
2012-07-20 by Here i am
Thanks for the Responses, the reason i am after this specific Layout is i am restoring an old Homebrew Linear Amplifier that was built by a friend of my
Re: Bridge rectifier
2012-07-19 by tda7000
... A basic PCB Layout for 4 diodes as a bridge rectifier is nothing special either.
Re: DIY laser transfer paper with water-based "gum" glue
2012-07-19 by tda7000
Note this though: http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/30367 ( Only the true Dissolvo brand worked well, other, cheaper water soluble
Re: card edge mounting
2012-07-19 by James
... I think you would have a really hard time getting enough contact pressure to make a reasonably good contact while still being able to slide the board in
Re: Bridge rectifier
2012-07-19 by James
... If all you want is a bridge rectifier, what do you need a PCB layout for? Is there any reason not to use an off the shelf monolithic part?
Re: Acid etch time
2012-07-19 by James
... Heating the solution makes a huge difference. I use a vertical etching tank I made of plexiglass with an aquarium heater and a bubbler to agitate the
Re: DIY laser transfer paper with water-based "gum" glue
2012-07-19 by AlienRelics
... Dissolvo keeps getting mentioned. Look in Photos for the folder TT + Water Soluble Paper . http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/27448
Re: [Homebrew_PCBs] DIY laser transfer paper with water-based "gum" glue
2012-07-19 by Robin Whittle
Short version: More details of making this transfer paper, including using a globally available Elmer s glue. Also, no success using wash-away Poly Vinyl
RE: [Homebrew_PCBs] Re: card edge mounting
2012-07-17 by Riley
QUOTE: I was simplying wondering if there was a connector that you can slide the card into lengthwise a lever type side entry linear zif connector would work
RE: [Homebrew_PCBs] Re: card edge mounting
2012-07-17 by Tony Smith
... card ... when I ... can t ... Presumably it s been relegated to we used to do that status; many things are in the it seemed like a good idea at time
RE: [Homebrew_PCBs] Re: card edge mounting
2012-07-17 by David Bobb
I m not doing top and bottom connectors and I m not doing hot swappable. All the fingers are on the top, because the microcontroller is on the top. Power
Re: card edge mounting
2012-07-16 by tda7000
... Good point, but not always that simple, especially when big corporations and large marketing budgets and such get taken into account.
RE: [Homebrew_PCBs] Re: card edge mounting
2012-07-16 by Tony Smith
... As always when trying to do something unusual, the question to ask is why no-one else is doing that (and it s not an easy question to ask). Unusual tends
Re: [Homebrew_PCBs] Re: card edge mounting
2012-07-16 by David Bobb
... -- -Dave. [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: card edge mounting
2012-07-16 by Harvey White
... That s what TEK did. The connectors were all spring loaded (the entire body), and were designed to connect from one plugin to another, sitting in an
Re: card edge mounting
2012-07-16 by David
... I think the OP is asking about Card Guides. These are slotted guides that are mounted to a backplane or the rear of a card cage that guides a PCB card
Re: card edge mounting
2012-07-16 by designer_craig
There used to be an edge connector like this, I used it on a PBX project back in the 80 s. It was called a Ziff connector -- don t now the mfg but here is
Re: card edge mounting
2012-07-16 by KalleP
... The wiping action would have to rotated, the contacts would be pushed far apart (and need to be stacked for any kind of appreciable contact density) ...
Re: [Homebrew_PCBs] Re: card edge mounting
2012-07-15 by Harvey White
... Connectors are not designed for that kind of sideways force. The actual wiping would be done across the socket, not perpendicular to. Hot swapping would
Re: [Homebrew_PCBs] Re: card edge mounting
2012-07-15 by David Bobb
By sliding lengthwise, imagine you are installing a peripheral card into your computer, PCI, ISA, AGP, PCI-E; doesn t matter. Instead of pushing it in from the
Re: card edge mounting
2012-07-15 by James Newton
... I m not sure what you mean by slide in lengthwise . There are lots of connectors that can be used on the edge of card, and where the card can be slid into
Re: [Homebrew_PCBs] card edge mounting
2012-07-15 by Riley
not quite what you re looking for, but floppy drive cables provide a cheap & easy way to get from board traces to ribbon cable. can also work as an sd card
card edge mounting
2012-07-15 by davesversion
Has anyone seen any kind of dual card edge mounting that would slide in lengthwise? I brought fingers out to both sides of this card I made, it s 1.22 wide,
Re: Lowell Laminators
2012-07-13 by John
Yes, only ships to AU addresses.
Re: [Homebrew_PCBs] Re: Lowell Laminators
2012-07-12 by KeepIt SimpleStupid
Here is a website detailing a very low cost Lowell Laminator and the necessary mods. http://ultrakeet.com.au/index.php?id=article&name=superFuserV2 They
Re: Lowell Laminators
2012-07-12 by John
Thanks for the information Robin, The unknowns for these devices (other than availability) are the thickness they will hande and the temperature limits. It
Bridge rectifier
2012-07-12 by BILL S
Hi Group, i m after picture of The PCB layout of a Full wave Bridge rectifier that appeared in the 1982 and 1985 edition of the ARRL Handbook, does anyone have
Re: [Homebrew_PCBs] Lowell Laminators
2012-07-11 by Robin Whittle
Hi John, ... Please see my 2012-06-02 message: http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/30171 There are two sizes of laminator. For a given
Lowell Laminators
2012-07-11 by John Ferrell
Yuk! Now I know why I cannot get reasonable results with the GBC unit I bought! So far, I have not found a source for the Lowell Laminator in the US. If anyone
Re: H220 need help with re assembly of unit Picture of inside
2012-07-11 by krisfr
Thanks, that was good but not like the one I have I posted to the photos my laminator Thanks agian.
Re: [Homebrew_PCBs] Re: Acid etch time
2012-07-11 by Leon Heller
... I do my etching with FeCl3 in a small plastic food container in an old washing up bowl with about 1 of just boiled water in it. With continuous agitation
Re: [Homebrew_PCBs] H220 need help with re assembly of unit Picture of inside
2012-07-11 by Jan Kok
Googling for gbc laminator mods turned up this page, among many others: http://ultrakeet.com.au/index.php?id=article&name=superfuser That has some pictures
Re: Acid etch time
2012-07-10 by tda7000
No surprises there, you re using H202 up to 10x stronger than most people. Another guy using 30%:
Re: Acid etch time
2012-07-10 by Mike
I usually etch in a plastic food storage bin. If the etch is going slowly, I take the bath, board and all, and place it in the microwave for 60 to 120 seconds.
Re: Dissolvo water-soluble paper as a laser toner transfer paper?
2012-07-10 by JP
Hello, Madhatter magic shop has 100 sheets 8x11 for $36.00 From J.P.
Re: Dissolvo water-soluble paper as a laser toner transfer paper?
2012-07-10 by leeleduc
I ve tried it and it worked pretty well. See message #27445. I also posted a couple of photos in the Photo section in a folder called Dissolvo Paper
Re: Acid etch time
2012-07-10 by leeleduc
If you want to experiment with different strenghts of Hydrogen Peroxide, here s a list of where to find Hydrochloric Acid and Hydrogen Peroxide in US stores.
Re: [Homebrew_PCBs] Acid etch time
2012-07-10 by Slavko Kocjancic
I use 1:1:1 and with near Nill agitation and without heating I the pcb is etched in les than 2 minutes. I use HCL 29%, H2O2 31%, and 100% H2O
H220 need help with re assembly of unit Picture of inside
2012-07-10 by krisfr
Does anyone have a picture of the inside circuit board area of a GBC 220? I lost my diagram when I disassmebled it... Thanks
Acid etch time
2012-07-10 by Peter
Never tried acid etching myself. This might be worth noting: If your PCB is lying flat in the bottom of the etch container, the disloved copper will leave a
Re: [Homebrew_PCBs] DIY laser transfer paper with water-based "gum" glue
2012-07-10 by Randall Morgan
Interesting... I worked HAZMAT for a few years many years ago and we had PVA gloves that seemed almost impervious to everything but water. You could wash them
Re: [Homebrew_PCBs] More sources of gummed paper for laser toner transfer; "envelope gum"
2012-07-10 by Stefan Trethan
Just be aware that some of those gums are heat activated (as well as moisture). You don t want to wrap it around your fuser.... ST
More sources of gummed paper for laser toner transfer; "envelope gum"
2012-07-10 by Robin Whittle
The trick to solving many problems is finding the right search terms. Here are some Google terms which lead to sources of gummed paper in A4 sheets. I think
Dissolvo water-soluble paper as a laser toner transfer paper?
2012-07-10 by Robin Whittle
This message is an appendix to my previous message researching Poly Vinyl Alcohol (PVA) as part of a laser transfer paper. I was wondering whether Dissolvo
Re: [Homebrew_PCBs] DIY laser transfer paper with water-based "gum" glue
2012-07-10 by Robin Whittle
Still more information on Poly Vinyl Alcohol, including the availability of water-soluble film for embroidery. (In the Yahoo Group archives, to view the
Re: Acid etch time
2012-07-10 by tda7000
Well, I keep mine in the white (not transparent) bottles it comes in, in the shed, so it s probably not getting much light if any.
Re: [Homebrew_PCBs] Re: Acid etch time
2012-07-10 by Slavko Kocjancic
If you leave peroxide (3%) on sun for day or two it s unusable for etching. It must be stored in the dark place. In light it s disolve to Oxigen and pure
Re: Acid etch time
2012-07-09 by tda7000
I had a slow etch problem last time I made a board. I think the temperature was rather low (I was doing it on a winter evening) also my chemicals are rather