How to make a single transistor oscillator
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- Опубликовано: 22 июн 2018
- How to make a single transistor oscillator
In this video we crate a single transistor oscillator by taking advantage of the reverse breakdown region of a 2n2222 transistor. You will need at least 12VDC and may have to try a few transistors before you find one that will oscillate.
Take note of the waveform, you get very fast rise times and and nice slow capacative decay.
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Me: Paul, 49 from USA
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you are breathing very hardly, i hope you r okay
The reason that the led doesn't go all the way off is that capacitor is always charging through the led (or it is shorted through the transistor). If you want to flash, put the led in series with the transistor, and the capacitor across the transistor-led pair. Then the led will light when the transistor avalanches (discharging the capacitor through the led and the transistor. You can then use a larger charging resistor to get more reasonable time constants and slower flashing rates.
Bro could not bright 🤔
Wait, how did you know it was Saturday?
It's called an Esaki oscillator...
Sawteeth wave
My love of analog electronics over digital is what made me become an RF engineer in a TV Lab. Love the work. And thanks for this video. We need kids to learn ana-elect much. Problem is, good teachers with good design experience is hard to come by.
I didn't see the LED flashing
yea i agree and i am so tired of hearing about arduino.
Use a 10k pot at the input to play around with the hz. Hook output up to speakers. Sweet.
Paul bringing back the finesse...
OK, I'm going to build this circuit tomorrow. It's going to be about 100 and I'm staying in the airconditioned house. I read the comments and I'll try some of those ideas as well. Thanks for a teaser of a circuit and another good video!
TBH, this is a very clever relaxation oscillator. Unfortunately, most of the simulation software is not capable of modeling a transistor in reverse avalanche mode.
I really like how this guy explains everything
good practical explanation of oscillator circuit, thanks
I agree with the person that said about programming microcontrollers is too much of a go to. However, all of my projects always have a problem with " feature creep" and my background is programming, not electronics so I always graduate towards the microcontroller solution. It always ends up being bigger and more expensive with the discreet components now days than with the microcontroller anyway. In this case, you have 6 components instead of one. But I loved the video and the lesson, many thanks..it will prove useful.
Thanks for posting!
Great video - thanks for posting!
Thanks for the vid from one STS to another. I hope all is well with you and if you are a ham I wish you 73s!
Just finished the circuit , could not see led pulse after adding second cap .Going to play with more caps later .Looking forward to next project thank you