Thank you for the hints.
Thanks to your and other's comments on the Elecraft list I have found
numerous good examples with some as minimalistic as a FET + passives all
the way to a good Instrumentation Amp + passives.
This has inspired me to create a circuit based more on the modern In-Amp
method leaving the only question of what the input impedance and range
of typical radio mic inputs. Plus a survey of what voltage and current
are available on the mic connector helps design for the most radios.
In support of this I am scoring some wins on D104 mics on Ebay which are
available on the cheap.
Fun stuff... perhaps I will make this available as a "kit" for fellow
D104 freaks.
John
Greg Derda wrote:
I am pretty sure that there are a couple of very simple circuits in
"W1FB's Design Notebook" that specifically use the "D104 ->
modern_radio" as an example.
Greg
KI4MMM
K2 #6100
On Sep 6, 2007, at 1:29 PM, Don Wilhelm wrote:
John,
If your D104 is an older one with the high impedance crystal or
ceramic element, yes it will not work so well (if at all).
There was an article in QST about a year ago with a circuit design
that had a very high impedance input and the low impedance output
required by modern day radios, although a transformer with the right
ratio should work too.
Another alternative is to change the element in the D104. Heil
offers a kit to do just that - check www.heilsound.com for info.
My D104 with an HC5 element draws comments from time to time.
73,
Don W3FPR
John Huggins wrote:
Thanks for the information all.
So...
I guess hooking up a D104 straight to K2 is not going to work out so
well. Yes I know this is like putting tail fins on a Ford Taurus,
but the kids really dig talking into a mic like that during times we
promote ham radio.
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