[Amps] RE : Solid state amp

Wed Jul 12 00:06:32 EDT 2006

Mike,

I highly doubt a problem like this. The glue is on the other side of the PC board pad from the copper. Plus it glues down to the copper ground plane of the main board which acts like a heatsink. Between the insulation of the glass-epoxy board the pad is made from, and the heatsink properties of the main board, the heat from soldering will probably at most just make it warm. To produce fumes, one would have to get it really hot, and probably put a flame to it. Welding would surely do it as we're talking about 2500 deg F or more in some instances. Also, there's been many hams doing this, and not one complaint has been made so far that I've seen. The major complaint is folks getting their fingers stuck together with the glue. They recommend keeping a bottle of nail polish remover around (Acetone) to get one un-stuck hi hi! I've never noticed any strange smells or smoke from under the pads either, just the regular smell-smoke from the solder flux. If you think, as small as most parts leads are, it doesn't take but maybe three seconds of heat to solder a joint. Generally, some parts can be held by the fingers without being burnt.

Best,

Will

>*********** REPLY SEPARATOR ***********
>
>On 7/11/06 at 6:54 PM mike kendall wrote:
>Will,
>  Superglue is also called cyanocrylate.  Years ago, I broke an aluminum
>shifter on a motorcycle and super glued it (it actually worked long enough
>to use the bike another day) and then brought it in for a friend to tig
>weld it until I could buy a replacement.  My friend became ill from the
>fumes of the cyanocrylate for a couple days, I felt horribly guilty about
>the whole thing.  I am no expert but maybe some kind of cyanide gas was
>produced in small quantities.  I don't if manhatten style construction
>could potentially produce the same results but I would want really good
>ventilation on the project just from personal experience with superglue
>getting heated up.
>Mike
>
>Will Matney <craxd1 at verizon.net> wrote:
>Angel,
>
>Manhattan style construction is similar to dead-bug construction, but
>instead of using high ohm resistors for tie points, one uses small pieces
>of PC board. These can be cut into small squares, or punched out round.
>Then a small drop of super glue on the bottom to bond it to the main PC
>board which is the ground plane. This gives you an insulated pad to solder
>to. Far Circuits has some IC pads made up just to go with this. I bought a
>hand punch for mine where I can punch out rounds from 1/8" to 1/2" if I
>want to. I generally use 1/4" and 3/8" diameter though. Below are three
>links to webpages about it.
>
>http://www.k7qo.net/
>
>http://www.qsl.net/w0pwe/Homebrew/Homebrew.html
>
>http://www.k8iqy.com/
>
>Best,
>
>Will
>
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>
>On 7/11/06 at 7:17 AM Angel Vilaseca wrote:
>
>>Will,
>>What do you call "Manhattan style construction"?
>>
>>Angel Vilaseca HB9SLV
>>
>>
>>Will Matney a écrit :
>>
>>>If one wanted, and according to what transistor / fet is used, can build
>>a decent solid state amp at a reasonable price. That is including the
>>filter networks. I hate to say this, but the CB community (some models)
>>have advanced more in the mobile solid state department than the amateur
>>community over the FCC looking down upon the manufacture of broadband
>>amps. There's not too many amateur solid state amps if you look, and the
>>ones from Henry, and a few others will set you back a small fortune. Since
>>the CB market has mass produced these, the parts are available pretty
>>cheap on the market. One can go to Westgate Parts and buy every component
>>to build one. Most of the large CB ones out now are using Manhattan style
>>construction, and anyone else can too. That gets you out of using etched
>>PC boards. Even at that, with what's available now, etching a PC board can
>>be done cheap (positive sensitized boards), or buying a custom from
>>someone like Far Circuits which is pretty cheap. I've been contemplating
>>doing a small one myself!
>>>
>>>The one at the link Jos provided look's pretty darn good from the
>>outside, but before I would pass judgement, I'd have to see the innards.
>>Which that goes with any amp for me. I don't like buying a pig in a poke.
>>(a poke is a bag in hillbilly terms, hi hi!).
>>>
>>>Best,
>>>
>>>Will
>>>
>>>
>>>*********** REPLY SEPARATOR ***********
>>>
>>>On 7/6/06 at 5:41 PM Bert Almemo wrote:
>>>
>>> 
>>>
>>>>Hi Jos,
>>>>
>>>>As far as I know this is an amp for the hamradio bands. Why would this
>>be a
>>>>solution for "less amateur and more cb like"?? I don't think CBers will
>>>>spend US $3,000 for an amp with an output of "only" 1KW PEP. Most of the
>>>>features are geared for easy band switching and auto tuning. It seems to
>>be
>>>>a great amp that's coming from Europe for a change! The price is also
>>>>reasonable.
>>>>
>>>>73 Bert, VE3OBU
>>>>
>>>>
>>>>
>>>>-----Original Message-----
>>>>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
>On
>>>>Behalf Of hermans
>>>>Sent: Thursday, July 06, 2006 2:55 PM
>>>>To: 'Vic K2VCO'; 'Martin Sole'
>>>>Cc: amps at contesting.com
>>>>Subject: [Amps] RE : Solid state amp
>>>>
>>>>In the mean time one should have a look at
>>http://www.linear-amplifier.com
>>>>One never knows this might be a sollution for lots off people such as
>>less
>>>>amateur and more cb like .......hi hi
>>>>
>>>>Jos on4kj os5n ( or6g ) 
>>>>
>>>>-----Message d'origine-----
>>>>De : amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] De
>>la
>>>>part de Vic K2VCO Envoyé : jeudi 6 juillet 2006 17:02 À : Martin Sole Cc
>>:
>>>>amps at contesting.com Objet : Re: [Amps] Solid state amp
>>>>
>>>>
>>>>Martin Sole wrote:
>>>>
>>>> 
>>>>
>>>>>With all this talk about these medium voltage FETs I am reminded that 
>>>>>earlier this year there was mention of two solid state amps from 
>>>>>Elecraft, KPA800 and KPA1500. Anybody hear anything recently? I see 
>>>>>nothing on their website or reflector so presumably it was a joke/hoax.
>>>>> 
>>>>>
>>>>It's definitely real, I just recently saw the 1500 watt prototype. They
>>>>had
>>>>some delays getting some of the bits and pieces but it is expected to be
>>>>available this year.
>>>>--
>>>>73,
>>>>Vic, K2VCO
>>>>Fresno CA
>>>>http://www.qsl.net/k2vco _______________________________________________
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>>>>
>>>
>>>
>>>
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