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Re: [softrock40] Roll your own amplifier

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  • Sid Boyce
    ... And in the UK Maplin may be still sells a 12V drill press I have used for many years, it does a neat and fast job of drilling PCB s. 73 ... Sid. ... -- Sid
    Message 1 of 3 , Mar 2, 2011
      On 02/03/11 15:53, Bruce Tanner wrote:
      > Sears among others carries a small drill press for portable/Dremel tools
      > that work very well for this task.
      > bet
      > ---
      And in the UK Maplin may be still sells a 12V drill press I have used
      for many years, it does a neat and fast job of drilling PCB's.
      73 ... Sid.

      > On 3/2/2011 9:23 AM, AI2Q wrote:
      >> *I can attest to the fact that the G6ALU amplifier that Bob refers to
      >> at **http://www.radio-kits.co.uk/**works really well. I built one for
      >> my PIC-a-STAR, and it works FB from Top Band all the way up to 10
      >> meters. Some guys report using G6ALU amps on 6 meters, but I haven't
      >> tried that.*
      >> **
      >> *Note that G6ALU supplies all the necessary mirror image artwork on
      >> the Web site for homebrewing the amplifier. I etched my own circuit
      >> board for it, and his design worked right off the proverbial bat. It's
      >> a wonderfully stable and very linear low-IMD amplifier.*
      >> **
      >> *The Radio Kits Web site include all the details and artwork for
      >> homebrewing an accompanying G4TZR lowpass filter, too.*
      >> **
      >> *Making your own circuit boards is really not difficult. Once you have
      >> art in hand, and get the hang of it, you can bang out boards in a
      >> matter of minutes. **Most of my PCBs are double-sided, to boot. *
      >> **
      >> *It helps to have a small drill press to make the through-holes,
      >> though. I suppose you could do this manually with a hand drill, or
      >> even a Dremel tool, but I think a drill press is a requisite. BTW,
      >> image files that show holes in the pads actually serve to align the
      >> drill bits after etching as tiny ridges form, thereby helping to
      >> center fine drill bits.*
      >> **
      >> *I use inkjet glossy paper, upon which the images are applied from a
      >> laser printer. You can also use Press-n-Peel
      >> <http://www.techniks.com/how_to.htm>, but it's more expensive than
      >> inkjet paper. I use a brand of inkjet paper called Special Moments,
      >> which sells in Dollar Tree stores around here for a buck per 12 sheets
      >> sized 8-1/2 x 11. The laser toner acts as the resist, and mouse bites
      >> can be touched up with a fine-tipped Sharpie pen prior to etching.
      >> Some people have claimed that running inkjet paper through a laser
      >> printer will damage the printer's fuser, but I have not experienced
      >> that with my H-P machine.*
      >> **
      >> *Mirror images are applied to your polished and clean copper PCB
      >> substrate using nothing more than a clothes iron. I press down on the
      >> paper for one to two minutes, depending on board size. *
      >> **
      >> *The boards are then conventionally etched in a warm ferric chloride
      >> solution. *
      >> **
      >> *The technique even permits etching of ultra-fine lines down to 0.5-mm
      >> for high density SMT. If you mess up the image transfer you can wipe
      >> off the resist with a solvent and start over using the same copper. I
      >> also found that 2-oz. copper board material makes for a more robust
      >> board than 1-oz. copper. *
      >> **
      >> *Vy 73, AI2Q, Alex*
      >> **
      >> __________ Information from ESET Smart Security, version of virus
      >> signature database 5919 (20110302) __________
      >> The message was checked by ESET Smart Security.
      >> http://www.eset.com

      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
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