True classic engineer talk there "this should theoretically work, but it doesn't."
2 weeks ago | 35
Theory is when you know everything, but nothing works. Practice is when everything works, but no one knows why. Around here, theory and practice are combined —- Nothing works and no one knows why.
2 weeks ago
| 18
Could you please elaborate on this unit. I have been thinking about it a whole week now. Very intrigued.
2 weeks ago | 1
brilliant ! not sure about any of it but dang it all stay passionate ! ! !
2 weeks ago | 0
Most likely the inductor is needed to tune the circuit, otherwise amplitude will be too low for the detector diode. Could work with just the diode if the frequency is just right for the specific capacitance of the wheel. If it was ever implemented as a full organ, I think there would have been variable inductors and capacitors to tune each wheel and their outputs for peak amplitude. Or just much stronger drive, something like 12-24v to overcome the imperfectly tuned circuit and it's losses.
2 weeks ago | 0
Q, I guess. Perhaps the inductor forms a nice little resonator at the carrier frequency and amplifies the signal with its resonance....dunno but you da man.
2 weeks ago | 3
I think you need two diodes! First is as usual, second shunts tone wheel so it allows the current to "go back". Because this tone wheel has "capacitor at the output" which is unable to pass direct current. Putting just one diode to it leads to DC current which charges up that capacitor to the point diode never opens again. This would become"voltage doubler" type detector. The same circuit is used in microwave ovens: one diode is magnetron itself but there is second one attached to chassis, absolutely necessary to function.
2 weeks ago | 1
I don’t entirely understand the set-up; what’s the working medium? Is it electrostatics, electromagnetism, air, capacitance, inductance, or some arcane combination of them all? I’ve got to say, it’s very smart and elegant.
2 weeks ago (edited) | 0
I'd like to see a quadrature demodulator into an X/Y 'scope, once you've got a signal gen that'll output quadrature sines. (sine and cosine if you like)
2 weeks ago (edited) | 0
You could use the bias oscillator from an old tape machine
2 weeks ago | 0
LOOK MUM NO COMPUTER
RESPONSE TECHNICAL TO THE PREVIOUS VIDEO. thanks for all of the responses basically saying "you dont need the coil from the AM schematic" thanks! but i went in with that thinking also. in theory you could make it work indeed with just germaniu, diode and filter. but i couldnt get it to do it. i gave up. cracked out the radio toy and wired that in, after trying a few things a little bit more "practical" than trying what i thought would work theoretically i got to just the diode, and the filter circuit but! with the coil. it just wouldnt even work a little bit without the coil.
i think the solutio will be in the carrier frequencies amplitude im going to boost that by making a +12/-12v 150khz ish sine wave, instead of using that (frankly awful! dont buy one!|) signal generator.
just thought id explain myself! all well and good implementing what it should be! until it doesnt work haha. peace.
2 weeks ago (edited) | [YT] | 356