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| Fast square wave with arduino and mosfet |
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| ManlishPotato:
Aaaaand apparently i'm an idiot! Yes i had the oscilloscope hooked up in parallel to the tank circuit, exactly like in the schematic with normal 10x probe. I'm pretty new to oscilloscope's, so i'm still kinda learning where to place the probes for accurate readings. I know how to do it safely, i'm just not familiar to all the intricacies of the practice just yet. The circuit is virtually the same, this time i was using a 560ohm resistor. I included some pictures of the waveform down below, one with 10mH inductor, and one with 0.15mH. Using a resonant freq calculator gives us reasonable values of 11.105mH and 0.1332mH. In these i had the probe ground connected to the lowest ground in the circuit and the other end connected to negative side of tank circuit. I also included some pictures of the circuit of anyone is still curious :) The conversation might go on, but i would like to thank fourfathom and anyone who helped me find a solution! //Benji |
| fourfathom:
--- Quote from: ManlishPotato on September 27, 2019, 03:33:36 pm ---Yes i had the oscilloscope hooked up in parallel to the tank circuit, exactly like in the schematic with normal 10x probe. --- End quote --- It's working!!! Great news! To be honest, your probing "technique" is a problem that that most of us old-timers would't have been considering when troubleshooting this circuit. You must be using a floating (non-grounded) power supply, or (shudder) not have your 'scope grounded, because otherwise you would have short-circuited the power supply through the inductor. Usually we clip the scope probe ground to "circuit ground". If we want to measure a signal relative to some other voltage (directly across the tank circuit in your case) we will use two probes and subtract the signals. Could you measure the inductor resistance for me? (might as well measure both of them.) I'm still curious about the amplitude and "damping" differences between your circuit and my simulation. It's probably due to resistance. And thank you for sticking with this and reporting back. I'm here to a large extent for the "puzzles". My wife likes crosswords, and I like circuits! |
| ManlishPotato:
For anyone still interested, here is the final schematic i used to achieve my goal! I also included a picture of the final soldered project :) |
| ledtester:
Using the ring-down method: http://www.giangrandi.ch/electronics/ringdownq/ringdownq.shtml the Q of your tank is around 19. |
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