rob t wrote:strange as they got the detector right
turretslug wrote:Circuit as shown will give increasing +ve bias on UCH g1 as signal strength increases- needs to be increasing -ve for appropriate AGC sense.
Murphyv310 wrote:What a good idea Building things is magic, I still like knocking up little projects and its what you learn from.
I'm happy to help
Till Eulenspiegel wrote:Murphyv310 wrote:What a good idea Building things is magic, I still like knocking up little projects and its what you learn from.
I'm happy to help
Count me in. All construction projects should be encouraged. It's almost thirty years since I made something interesting, the standards converter. Although if you think about, I rebuilt it over the winter months. December 2012 to January this year.
There was a two valve FM super regenerative set in PW from 1954 that I built a few years ago. It used two Acorn valves and was quite impressive. It was super sensitive and would lock onto the station as well, audio quality was good and easy to build, with a low component count.
Till Eulenspiegel wrote:Here's a simple radio that might be fun to consruct. It's the Italian "Ninnolo" radio set. Only two valves are employed, an UCH81 frequency changer and an ECL80. An OA72? crystal diode is the detector. the set has no IF amplifier stage so I've no idea what the performance would be like.
turretslug wrote:I think whoever drafted the Ninnolo circuit was confused as to which way round these new-fangled solid-state diode thingies should be drawn...
Crackle wrote:I would love to join in, I have not built a radio for over 40 years, and have never built anything valve based.
Westcliff wrote:I'd like to join in too.
Michael Watterson wrote:But if this became popular supplies of old parts for restoration would be badly raided.
I can only support use of old parts in "one off" ventures. For multiple builds new parts or at least very very common parts have to be used.
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