hello larskro, how can this circuit be calculated. how is the voltage, the resonance frequency of 50 kHz, the tube, the R and C entangled. it is a very interesting thing, that a metall tube reacts that way.
this IS an amazing circuit! awesome work here I love it. I have been trying to use my oscillator for a synthesizer i built to tune a coil and instead of hearing an audible tone, send the square wave through the coil, tune with a pot, and transmit wirelessly to a receiver coil. (probably to an led) I just need to figure out the capacitor values to get a higher frequency.. really interesting
Almost. If you try to keep your eyes in one place and turn your head, your eyes will pick up on the flashing. Well, mine do, anyway. Out of the corner of my eye, I could see the old computer monitors blink, from time to time, depending on how tired I am. I could see the 60 HZ refresh rate. :-D If I was real tired, they would give me one hell of a headache....
No not magic. The ferrite cores will increase the Reactive Impedance of that part of the circuit no matter where they are placed in the loop. Therefore the maximum voltage drop occurs across that part of the circuit. It is completely irrelevant that the LEDs light in this inverse parallel connection, an a.c. voltmeter would be just as informative with a loading resistor across it's terminals.
Please don't bother to comment, I'm moving on and won't reply.
Forgot to mention that it can't be A/C because LEDs (at least the ones I'm aware of) are polarized. Alternating current would burn it out. So it is most likely pulsed DC being applied. Also, 50k frequency sounds very familiar - the output of the joule thief circuit usually ranges from 10k to 70k+ pulsed DC. Are you using a joule thief to power it?
@tenkosami LED's will work on AC but they will only light on the part of the cycle that they are polarized to. I have run an LED on 115VAC with a 330K resistor for I limiting and it worked fine. You can just barely distinguish it flashing.
Creating a changing magnetic field in the center of the toroids using pulsed DC from a battery (must be a circuit pulsing it). The magnetic field also fills the metal in the frame of the glasses, and since it's changing it generates an electrical current in the frame. By completing the circuit in the frame using the LED, the current can flow without being trapped as an eddy. Very cool demonstration! Check out the Joule Thief Circuit if you haven't already.
How long this can run on a single battery?
Migueldeservantes 1 month ago
hello larskro, how can this circuit be calculated. how is the voltage, the resonance frequency of 50 kHz, the tube, the R and C entangled. it is a very interesting thing, that a metall tube reacts that way.
any further hints would be very appreciated.
tnx
gerhard
gerhardusmaximus 3 months ago
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this IS an amazing circuit! awesome work here I love it. I have been trying to use my oscillator for a synthesizer i built to tune a coil and instead of hearing an audible tone, send the square wave through the coil, tune with a pot, and transmit wirelessly to a receiver coil. (probably to an led) I just need to figure out the capacitor values to get a higher frequency.. really interesting
LiquidChem 4 months ago
Comment removed
LiquidChem 4 months ago
resonate is a verb, and resonant is an adjective.
LiquidChem 4 months ago
just wanted to mention.. its "resonant", not "resonate". (resonant frequency). Oscillators resonate at their resonant frequency.
LiquidChem 4 months ago
Almost. If you try to keep your eyes in one place and turn your head, your eyes will pick up on the flashing. Well, mine do, anyway. Out of the corner of my eye, I could see the old computer monitors blink, from time to time, depending on how tired I am. I could see the 60 HZ refresh rate. :-D If I was real tired, they would give me one hell of a headache....
Landotter1 5 months ago
@Landotter1 that's true
Jjunior130 4 months ago
@theemusic92
What do you mean?
Landotter1 5 months ago
BC107b is NPN type....btw nice experiment. Did you tried without PNP transistor?
As BDX33C is already a Darlington type.
Zsakf0s 6 months ago
BC107b is NPN type....btw nice experiment.
Zsakf0s 6 months ago
No not magic. The ferrite cores will increase the Reactive Impedance of that part of the circuit no matter where they are placed in the loop. Therefore the maximum voltage drop occurs across that part of the circuit. It is completely irrelevant that the LEDs light in this inverse parallel connection, an a.c. voltmeter would be just as informative with a loading resistor across it's terminals.
Please don't bother to comment, I'm moving on and won't reply.
MrFrancisH 9 months ago
Forgot to mention that it can't be A/C because LEDs (at least the ones I'm aware of) are polarized. Alternating current would burn it out. So it is most likely pulsed DC being applied. Also, 50k frequency sounds very familiar - the output of the joule thief circuit usually ranges from 10k to 70k+ pulsed DC. Are you using a joule thief to power it?
tenkosami 10 months ago
@tenkosami LED's will work on AC but they will only light on the part of the cycle that they are polarized to. I have run an LED on 115VAC with a 330K resistor for I limiting and it worked fine. You can just barely distinguish it flashing.
Landotter1 6 months ago
Creating a changing magnetic field in the center of the toroids using pulsed DC from a battery (must be a circuit pulsing it). The magnetic field also fills the metal in the frame of the glasses, and since it's changing it generates an electrical current in the frame. By completing the circuit in the frame using the LED, the current can flow without being trapped as an eddy. Very cool demonstration! Check out the Joule Thief Circuit if you haven't already.
tenkosami 10 months ago
Thank you very much
rainmanp7 11 months ago
very cool man thanks
Magneticitist 11 months ago
Thank you for making that video. A light just went on in my head too.
We need more people like you doing stuff like that!
QuarkToo 11 months ago
Nice work , keep going
vishnukartha47 1 year ago
Very good experiment. Keep on going. Thanks for sharing.
chungsan1 1 year ago