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Page 108 of 707 · 35337 messages matched
2012-08-02 by Robin Whittle
Hi John, ... The floodlight is a yellow aluminium device with a glass cover and a steel frame for sitting on the ground. It is intended for building sites and
2012-08-01 by Nuno T.
Hi John, Don t have much experience with different exposure lamps to say which one is better, but can give you some solid info on the HF ballasts vs tube
2012-08-01 by v321uk
Robin, Does your 500W halogen connect directly to the mains or does it need a ballast or current limiter? Do you use a base (socket) how do you connect to the
2012-08-01 by Tony Smith
... once I had ... from ... following ... Ignore everything bar autotuning - it sets most of those options for you. They are pretty simple, but it s one of
2012-08-01 by zawy
I thought a temp controller should be easier to figure out, and I guess once I had it in hand the 4 pages of instructions in the 8 page manual would convert
2012-08-01 by v321uk
Robin, Fly Zapper tubes are around 350nm but will be changing soon to 368nm The following from:
2012-08-01 by John
The quartz halogen car headlamp bulb successfully exposed the PCB. I ran the bulb at 13.8V with just the 65W filament connected at a distance of about 4 from
2012-08-01 by Robin Whittle
Hi John, I am responding to your message in: Re: PCB light box - hf ballast / ... I guess a quartz iodide (AKA quartz halogen) headlight lamp would work OK
2012-08-01 by v321uk
Hi Robin, Thanks for the comprehensive info. Do you think a car quartz halogen headlamp would have sufficient UV output ? I have a new 12V dual filament 50W +
2012-08-01 by v321uk
Hi Paul, Thanks for the info on the commercial unit. Re timer as I need to make a board asap I ll just do it with clock and switch initially. Thanks, John
2012-08-01 by Robin Whittle
Hi Russell, In Re: [Homebrew_PCBs] PCB light box - hf ballast / tube wattage - 400W ... Wow!!! ... I think the 10 watt (power consumption) one would do the
2012-08-01 by John Anhalt
Regarding parallel vs. series, wouldn t putting the bulbs in series decrease the starting voltage available for each? In series, they share the same current,
2012-08-01 by Russell Shaw
... I got a 380nm 10W LED. I haven t tried it yet.
2012-08-01 by Paul
Hi John I don t know about the ballast question, in my old commercial but un-branded box which I got from a rally it matches the tubes. Mine has 2 x 8W 29cm
2012-08-01 by Robin Whittle
Hi John, Generally, gas discharge tubes cannot be operated in parallel. They need a high voltage to start, but settle down to a low voltage ca. 90 volts (I
2012-08-01 by v321uk
When buying an HF ballast and fluorescent tube does the ballast wattage have to match the tube wattage? Is it allowable to use an hf ballast of higher wattage
2012-07-31 by Bob Butcher
I uploaded a couple of photos of one cutter as well as some cuts made with the cutter. Note that the cuts were made on a Bridgeport milling machine with a
2012-07-31 by KalleP
Laminator ideas (untested :-). ... If you are ok with reading a manual you can work out most temperature controllers, it is a single setpoint so not rocket
2012-07-31 by zawy
The amount of benzene, lead oxide, acetone, and hydrochloric acid produced will depend on the temperature of the tip, the amount of rosin in the solder, the
2012-07-31 by lists
In article , ... MDF is worst of all. I use http://www.trend-uk.com/en/UK/product/AIR_PRO/4/178/airshield_pro_respirator_230v_uk_.html
2012-07-31 by wayne.causey
zawy, Thanks for the analytical data and regs pertaining to PCB dust, etc. I have been curious about these topics for some time and your information is timely.
2012-07-30 by zawy
The digital temperature controller looks nice and hard to figure out, but I m going to use my multimeter s thermocouple (the first time I ve ever used it) to
2012-07-30 by zawy
Tungsten carbide and fiberglass dust are allowed up to 5mg/m^3 in non-protected 8-hour work environments, day-after day. This is basically saying they are only
2012-07-30 by Slavko Kocjancic
... Do you can post some photo of that?
2012-07-29 by Tony Smith
... leaving a ... and ... the rod. ... The boards are made from fibreglass, the dust from cutting it isn t overly good for your health. The particles are
2012-07-29 by Peter Johansson
OT warning.... ... I have been told that carbide dust is quite dangerous. Are these concerns overblown? Do you take precautions? -p.
2012-07-28 by zawy
The Harbor Freight Laminator is a good thing because they keep the same items for years and years, so posting our experience with it could help others. It s
2012-07-27 by Bob Butcher
I am no t sure about the best cutter, but have an almost free solution to the problem. I have been using a homemade cutter for PCBs recently, and it works
2012-07-27 by Robin Whittle
Hi Tom, Can you tell us what type of Riston you have and where you live? - Robin http://www.firstpr.com.au/pcb-diy/
2012-07-26 by tda7000
... I bought some of these: http://www.ebay.com/itm/10-2-00mm-0787-CHIPBREAKER-CARBIDE-ROUTER-BURRS-DP-Kyocera-Tycom-/380446241277 (Really good seller, too!)
2012-07-26 by wayne.causey
Any recommendations? Bit and Speed. Thanks.
2012-07-26 by krisfr
Yes, this is the company that I ordered from too. They have increased their price also. I will hope for the best and see what happens. I ordered some of their
2012-07-26 by twb8899
I have DuPont dry film photoresist on hand if anyone needs some. I use it in a DuPont HRL-24 hot roll laminator so I can supply laminated FR-4 panels as well.
2012-07-26 by Robin Whittle
I just ordered a second batch of DuPont Riston MM540 (38 micron): http://www.ebay.com/itm/170869878820 from eBay seller gaminn: http://myworld.ebay.com/gaminn/
2012-07-26 by tda7000
I guess it s not the highest quality but it does work. Yes there are some wrinkles on my sheets too (but only on the edges) and I am not using the full size
2012-07-26 by krisfr
That, the link you show here, is the company I had the poor results with. One of the plastic sheet, on both side of the resist, was wrinkled and for my
2012-07-25 by tda7000
... I don t know about cheap but I bought the cheapest I could find at the time: http://www.ebay.com/itm/320735055777 So far it s worked well for me. Haven t
2012-07-25 by krisfr
Anyone know of source of Cheap Photoresist Film? My last purchase on ebay was poor in quality and high priced... Thanks in advance...
2012-07-25 by Greg
Kevin,scanned and sent to your yahoo email. Regards Greg vk5gj/vk5xgh
2012-07-24 by Kevin B
Steve, Yes you are correct, when it was originally built, the PCB design was from the ARRL handbook, he decided to use that over a point to point perforated
2012-07-24 by Norm
... I have the book (1985 ed.) - but a computer crash left me with no scanner/computer hookup (getting back there, but slowly). I can COPY them and send by
2012-07-23 by J. Caria
Hi, I have the 95 edition and it has the pcboard pattern for a HV power supply. I can see the same pattern in the 92 edition. Give me your e-mail address and I
2012-07-23 by Boman33
Well, I got 1965, 1979 & 1989 editions but unfortunately not the years he is looking for. Bertho ... From: Andrew Hakman Sent: Monday, July 23, 2012 15:54 I
2012-07-23 by Andrew Hakman
I have the 1991 edition, which I bought from a library clearing out old books, a long time ago now. The library I got it from is notoriously bad for keeping
2012-07-23 by AlienRelics
I expect he may have already posted in some groups dedicated to ham radio. I think what he is saying, is that this was built using the PCB pattern for a bridge
2012-07-22 by Mars Bonfire
A couple of thoughts and guesses: I totally agree with the poster who offered that the board looks like perforated board (i.e. point to point wiring) not a
2012-07-21 by T' Bear
For what it s worth; the Radio Shack part no. is still used by Radio Shack. They may have re-cycled it, but it still is listed as printed circuit board
2012-07-21 by Kevin B
Yes thats were I got the pdf from and it mentions the board layout from them arrl handbook ... From: Andrew Volk Sent: 21/07/2012 6:05 To:
2012-07-20 by Andrew Volk
Kevin - Have you looked at http://www.813am.qsl.br/artigos/linear/DX-811A_GG_Linear_Amplifier.pdf? No board layouts. It looks like it was all perf board from
2012-07-20 by Kevin B
Thanks Paul, The amp was built from an article in the September 1982 CQ magazine called how to build the DX-811a, I have that article along with the amp that