single transistor projects?
ard at p850ug1.demon.co.uk
Wed Mar 21 19:07:28 CDT 2007
> Good on ya, Brad! I built my first receiver with my dad--using a
I still haev the first radio I built -- 35 years ago, alas it wsa
transistorised . It was the well-known 'Ladybird book' design, using an
OC45 as a regenrative detector and a couple of OC71s as audio stages.
> 1G4GT, back when one could still buy "B" batteries. Many many years
These days, you can get 9V (PP3, 006P, 6F22, whatever you call them)
batteries very cheaply in the 'Everything's a pound' shops (I assume you
have similar shops that sell all sorts of things for a dollar a time). 5
to 10 of those in series will work as B battery, of couse.
Personally, I'd use a mains supply. a 30V transformer (15-0-15, ignoring
the centre tape or a pair of 15V windings in series) feeding a voltage
doubler rectifier (2 diodes, 2 capacitors) will give about 85V, ideal for
most 'battery' valve circuits.
More information about the cctalk