Demonstrating a 3 transistor receiver built for a construction competition. It has just 3 transistors and under 25 components but tunes part of 80 and 40 met…
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Demonstrating a 3 transistor receiver built for a construction competition. It has just 3 transistors and under 25 components but tunes part of 80 and 40 met…
Peter do you have the plans for it published any where on line? love it fab
concept for a project for the kids and big kids like me.. Regards Andy
(2E0CLY)
Andy, An article with much more detail than the video should appear in the
summer issue of Sprat.
VK3YE, would you like to post a schematic of your “Chopping Board” HF
receiver please? Is this receiver a Direct Conversion Receiver?
Hello Peter, VY COOL! How CW sound? 73 Herb/Wr9H
It is always surprising how well those infinite impedance detectors work
across a tank with just a little bit of LO drive from a nearby oscillator,
not directly connected. The ceramic resonator makes it super easy and
stable. I’d be tempted to use a LC VFO and cover the lower-half of HF, but
it would need a vernier or fine-tune gang/pot. Maybe a subharmonic VFO
tuning 1.5-2.5 MHz or so, which should be fairly stable?
Alan – it amazes me as well. Why would one bother with a regenerative
receiver when something like this has as much audio output? The only thing
is the regen receiver may be a bit more selective but in exchange you lose
many things eg oscillator pulling on strong signals or antenna blowing in
the wind. The best of both worlds may be a regen put to the point of
oscillation plus an external oscillator.
… in other words something like this with a front-end Q multiplier (which
I’ve never ever built)
Nice looking radio Peter, sounds like it is pulling in some AM at 4:54? Do
you zero beat the ceramic resonator with the am carrier when receiving am,
or just tune it far away so as not to hear any heterodynes?
Very nice, if I did that my xyl would have me on the chopping board 🙂
Adrian M3ONL
Nice idea! Vy 73 de DG1MJH
You can do both. Sensitivity is much better if zerobeat. Without a carrier
inserted it only picks up a few of the stronger stations.