In: .com, wrote:
Actually, you want to work backwards if you are going to fiddle like
this. The 455Khz signal is pretty low frequency so the board layout
skills are not very difficult. Starting from the front end can be
annoying, especially when your home made amp oscillates and oscillator
won't start.

Sounds like a wonderful idea, however.. I don't want to tear apart my radio to
experament. If I stumble across a cheaper, older one perhaps. (Or, maybe muck
around with a cheap MW radio)


This weekend (when I get home) I'm going to take a stab at Mr. Andersons
circuit:

http://www.tricountyi.net/~randerse/regen.htm

But.. I'd like to adjust it a bit. One thing I'm having some difficulty
with is locating the formula for calculating turns to inductance and
inductance to frequency. This was a problem last time I built a tube-based
regen receiver, I just did what they told me to do w/out finding out how the
number of turns was determined. (I got lucky I guess, because it worked..) :-)

For frequency, I've seen 2 formulas:

F = sqrt(25,300 / L*C)

And:

F = 1 / 2*pi * sqrt(L*C)

I don't know which way is correct? (where is the 25,300 coming from?)

I'm still searching for the formula for calculating the inductance of
turns on a toroid coil. (as that is what Mr. Anderson spec'd out)

http://www.radio-electronics.com/inf...e_am_demod.php

Wow, didn't they used to be a magazine?

Thanks for the URL! (I'd forgotten all about them)

Jamie
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