28 Nov
2009
28 Nov
'09
10:29 a.m.
Chuck Guzis wrote:
THey are not hard to find. I am sure they turn up on E-bay. Or grab a
junker AA5 radio and remocve the rtuning capactior, If it's too high a
capacitance, rip off some of the moving plates (seriously).
I really would recomend the 'Impoverished Radio Experimenter' books.
They're fairly modern and full of tips like this. THey are _not_ a course
in how to desing with valves, but you can make several radio receivers
Still, if you want to start simple, there's the Alfred Powell Morgan
1941 "First Radio Book for Boys". Extermely popular way back when,
so there are still used copies available.
Um what about variable caps and other hardware? I got a ham receiver from said books. Read them alongisde other books.
If you're seriously mad (that is a term of honour, of course), then you
might try 'The voice of the cyrstal' and 'Instruments of amplification'.
They coaver mauing radio receivers using _no_ commercial components. OK,
he dose yuse enammeled copper wire :-). The first book covers cycstal
sets (and one chapeter is making the variable capacitor), the second
covers making (very poor, but still hackish) valves and transistors.
-tony