Arduino USB powered Zener diode tester

[@hahaagi]

아주 좋네요. 잘보고갑니다.

[@derekschwontz9072]

Great tutorial

[@smartpowerelectronics8779]

Glad to hear!

[@ehsanbahrani8936]

Thanks a lot

[@smartpowerelectronics8779]

You are welcome! I enjoy many tutorials online, happy to know I can help! Did you use it for hobby?

[@ehsanbahrani8936]

@smartpowerelectronics8779 well, i am enthusiastic to know about IC's external circuits and how they work and what are they for. Thank you

[@arnavpawar256]

I have seen some videos about using Arduino PWM to generate a radio carrier wave of Mhz range, to communicate over long distances. But couldn't find a proper video explaining all the working. Can you look more into it? 😃

[@captainboing]

Can somebody explain why the transistor doesn't short the 5V to GND?

[@smartpowerelectronics8779]

Hi captainboing :-) The inductor of 2.2mHenry limits the current. -The transistor is switched at 31kHz, 70% PWM, so it is on for about 23microseconds. -The current in the inductor will increase slowly as in this formula: Ipeak = V x t / L = 5 x 23us / 2.2mH, that is 52mA peak!. Just imagine is as follows: a capacitor "stores voltage", an inductor "stores current". You use current to charge a capacitor, so if current flows into a capacitor it will charge and its voltage increases, like a battery or a bucket of water. You use voltage to charge an inductor, so if you apply a voltage on an inductor, it will "charge" and its current increases. The best analogy for me is a flywheel. You can check my video about the 5 to12V boost for more information: kzbin.info/www/bejne/barUXqproq6tlZo

[@captainboing]

@@smartpowerelectronics8779 got it, thanks. So the on time and frequency into the inductor create an effective "high impedance" path because the current doesn't flow out of the inductor terribly quickly while it is building its magnetic field, (so we try to keep it in the peak "building phase") and that limits the short. Using inductors has always been a black-art to me, beyond transformers etc.

[@Edmorbus]

Thanks for useful video sharing

[@smartpowerelectronics8779]

thank you!

[@RogerTannous]

What about using a MOSFET instead ?

[@smartpowerelectronics8779]

That would work, make sure you: -Select a small MOSFET that can handle 100V Vds (the popular BS170 is 60V only...) -Add a high value resistor(10k, 100k) from gate to source to make sure it is off until the Arduino starts up. -You can remove the 2k2 base resistor. -Make sure the MOSFET threshold voltage (Vth) is ok for 5 V drive (normally ok for a 100-200Vds MOSFET type)

[@spicemasterii6775]

This is neat!

[@smartpowerelectronics8779]

Thank you!

[@Pippo.Langstrumpf]

very interessting

[@smartpowerelectronics8779]

😉 thank U

[@rasimmaharramov]

👍

[@smartpowerelectronics8779]

Thanks 🙂