Jon Perelstein wrote:
Where exactly do I have double-sided printed circuit board sitting around? Do
I hacksaw off a
hunk from my television or from my computer? Radio Shack doesn’t sell it, nor
does Mouser.
Mouser do stock it.
<http://www.mouser.com/Search/Refine.aspx?Ntt=*copper*+*clad*&N=1323038&Ntx=mode%2bmatchall&Ns=P_SField&OriginalKeyword=copper+clad&Ntk=Mouser_Wildcards>
or specifically
<http://www.mouser.com/Search/ProductDetail.aspx?qs=nnh8%2fA0SuH%252buQH8CIqVpSA%3d%3d>.
Radio Shack also stock it:
<http://www.radioshack.com/product/index.jsp?productId=2102495&cp=&sr=1&origkw=copper+clad&kw=copper+clad&parentPage=search>
It's a very basic material for home construction, which is probably why
the author didn't feel it necessary to use the term "copper clad board",
which I used in my searches.
It also turns out that nobody carries the diode specified by the
schematic (1N34A).
The 1N34A diode looks to be a generic "Germanium point contact diode"
and any small diode so described should work (e.g., in the UK, at least,
OA91). It looks like it was the typical diode used in post war crystal
sets. The reason for specifying this sort of diode is that it has a low
voltage drop, so can be used to measure smaller voltages, but, if you
remember that the voltage is offset by about 0.6 volts, rather than
about 0.3 volts, any cheap switching diode, like the 1N4148 or 1N916
would probably also work.
According to Mouser, it’s obsolete and out of stock, but if I want to
pay a couple of hundred bucks,
Mouser are claiming to have 9,170 in stock, for immediate delivery!
<http://www.mouser.com/Search/ProductDetail.aspx?qs=A09egTk0tbXMpOf3uR8i2Q%3d%3d>
--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm>
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