![]() ![]() rfxcasey on Adobe Scientist Cuts A Dash With LCD Shifting Dress.Christopher Perry on Adobe Scientist Cuts A Dash With LCD Shifting Dress The Commenter Formerly Known As Ren on Adobe Scientist Cuts A Dash With LCD Shifting Dress.PPJ on Adobe Scientist Cuts A Dash With LCD Shifting Dress.The Commenter Formerly Known As Ren on NFTs And Tulipmania: A Little Bit Of History Repeating.Grumpy Old Coot on Adobe Scientist Cuts A Dash With LCD Shifting Dress.I don’t think anyone else involved in radio came up with as many key and major elements as Howard Armstrong. Then in the early thirties, he dud work on practical wideband FM, used in broadcast and other places. So Armstrong in decade came up with three major receiver types, nothing really replacing them since. They were still used for cheap walkie talkies a few decades go, and I think still used in some remote control things. A shift to a higher frequency would make use of the superegen to stake things out, followed by better equipment. But it was mostly useful for higher frequencies, and that helped. It stabilized the gain of the regen, so there was none of that finicky “right before it oscillated point for most gain” which often fell into oscillation because the antenna blowing in the wind loaded the circuit differently. Even today, most receivers are suoerhet, or based on the concept.Īnd then about 1922, he went back to the regen, because of a patent dispute, and pursued something he’d noticed earlier, which became the superegen receiver. Then about 1918 he came up with the superheterodyne receiver, which solved one problems, but added others. The regen was really popular for a while, and much longer as a simple receiver, but even today you can’t do much without an oscillator. Simplicity and complication at the same time.Īnd don’t forget, Howard Armstrong came up with the regen about 1913, also showing how to generate a signal with a tube (ie an oscillator). Then there’s the ever popular (well in some circles, especially decades ago) “supergainer”, which put a converter ahead of a regen detector, so a hybrid of the regen and superheterodyne receivers. The two are usually shown as separate, but Armstrong noticed the effect because he was playing with his regen. ![]() Posted in classic hacks, Radio Hacks Tagged Armstrong, breadboard, envelope detector, feedback, ferrite, radio, regenerative receiver Post navigationĪnd if you turn the regen up to “11” you get superegeration. And getting a handle on analog and RF concepts is always a treat. Positive feedback amplifies the RF even more, a germanium diode envelope detector demodulates the signal, and the audio is passed to a simple op amp stage for driving a headphone.Īmenable to solderless breadboarding, or even literal breadboard construction using dead bug or Manhattan wiring, the circuit invites experimentation and looks like fun to fiddle with. A little of the amplified RF signal is fed back into the tuned circuit through an additional coil on the ferrite rod that acts as the receiver’s antenna. Basically a reiteration of ’s original 1912 regenerative design, uses silicon where glass was used, but the principle is the same. Sometimes it’s the simple concepts that can capture the imagination, and revisiting the classics is a great way to do it. Adding a few components and exploring the regenerative circuit can prove to be a little more engaging, and that’s where this simple breadboard regen radio comes in. Trouble was, there’s only so much one can hope to accomplish with a wire-wrapped oatmeal carton, a safety-pin, and a razor blade. Crystal radios used to be the “gateway drug” into hobby electronics.
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