Electronics > Projects, Designs, and Technical Stuff
my own original oscillator
Rerouter:
Please draw the correct diagram, I have followed your original diagram as best I can, and played with it until I could come up with something that seemed to make the circuit repeatable.
I made the simulation because I am honestly trying my best to understand how this is working.
Even if you just edit the values or connections on the simulation I have made, please use "File - Export as Link" and post the long link here for the corrected version
krayvonk:
Well thankyou. Im too confused already, the neonbulb blasta was insane.
bsfeechannel:
I managed to quickly reproduce the krayvonk "oscillator" in my lab. What is causing the oscillation is the buzzer itself.
It works just like a neon oscillator. The buzzer has a region of "negative resistance". It starts buzzing with a voltage that is higher than the voltage with which it stops. So the buzzer draws a very low current while the capacitor charges up. Then the buzzer buzzes and suddenly draws more current. The capacitor discharges through the buzzer until it stops buzzing and the cycle goes again and again.
Mine is a 3v buzzer. But it buzzes with less than that as seen in the schematic.
The frequency of the "oscillator" is dependent on the supply. The LEDs of our clever engineer must be somewhere in series with the current drawn by the buzzer.
Have a good night and stay beautiful.
Alex Eisenhut:
Great. You stole his tech.
Ian.M:
Another cause of oscillation in a simple LED circuit with no other active devices, is if one of the LEDs is faulty with a cracked bond to the die forming a thermal oscillator. As long as the bond wire makes contact when the LED is at room temperature, current can pass and the die and bond wire will warm up, and heat the surrounding epoxy. If differential thermal expansion opens up the crack, it will break the circuit until the LED has cooled down again. The result is a faulty LED that when fed through a normal current limiting resistor will flash or blink with a frequency anywhere from a couple of hundred millihertz to several hertz.
You most often see this effect in one of an array of paralleled cheap LEDs that have been mechanically abused e.g. by bending and/or twisting their leads too close to the encapsulation, e.g the typical construction of dollar store LED torches. However its far more common for the damage to simply result in a dead, open circuit LED rather than a self-flashing one. It also tends to be fairly sensitive to further abuse - straightening or re-bending the leads tends to change the flashing fault to totally dead, but its vanishingly rare for the reverse to happen.
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