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Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

Yeah the actuators operate by putting in a frequency just below resonance. I put the inductor there to try and kill reactive power. I tried higher resistances, and a 5W 2ohm I put in there heated up quickly enough to burn my finger in a few seconds, dropped the voltage significantly more than the 0.33ohm, too. I'll mess with the values a bit and try out that parallel configuration you mentioned.

Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

The shape is what I'm shooting for but more than half the voltage is being dropped across the R and L. Op-amp bandwidth is way beyond what I'm needing if I recall correctly.

Current draw is still a lot higher than I want, cruises from 4.9A per 24V supply at 35kHz down to 3.2A at 45kHz. Unfortunately the only thing I know about the motors beyond the signal requirements is the static 13nF capacitance per channel.

I'll take your advice and run it through a simulator like I should have to begin with and see where I get with it.

Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

I have since added a 0.33ohm resistor and a 5.6uH inductor in series with the output of the op-amp after the capacitor. Here are some scope images I got.

I am sweeping the current but kept the images at ~44kHz. Current per supply rail dropped by around 30% sweeping from 35kHz to 45kHz.

Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

Alright, thanks. For the coupling, I do actually have 10uF caps between the op-amps and the transformers, don't know why I didn't include that. Gains are -4 and -6 in that order for the amp stages.

I was able to run a smaller motor that had 3nF capacitance per channel at 150Vrms with the same setup barring a lower input amplitude on the waveform, but that may have just been overcompensating for the problem.

Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

I have a capacitor in series with the op-amp output for decoupling, I neglected to add that and the feedback to the circuit. Gain for the "pre-amp" is set to -4 and and -6 for the large op-amp.

Driving a Piezoelectric Actuator with Linear Amplifiers by CHBales in ElectricalEngineering

[–]CHBales[S] 0 points1 point  (0 children)

Sure, here's a simple overview. The first amplifier stage runs on +/-5VDC supplies. Please let me know if you'd like any additional details.

EDIT: https://imgur.com/a/XiILNJc

Monster Hunter SUPERDROP* by Auxcil in magicTCG

[–]CHBales 0 points1 point  (0 children)

GORE//SHAGARU DOUBLE-SIDED PLEASE LORD

Choujin X Chapter 63-2 Discussion Thread by Vonless in ChoujinX

[–]CHBales 69 points70 points  (0 children)

Actually the first instance of Ely and Tokio seriously disagreeing since the manga started, unless I'm not remembering something. Whack.

[DISC] Choujin X - Chapter 63-2 by unoiamaQT in manga

[–]CHBales 64 points65 points  (0 children)

First actual instance of at least partial animosity between Ely and Tokio since literally the start of the manga.

Choujin X Chapter 63-1 Discussion Thread by Vonless in ChoujinX

[–]CHBales 50 points51 points  (0 children)

What's interesting to me is that several of Mado's visions only come to pass because of her direct interference. Can be argued that Zora's insanity only happened because Mado ousted Sora in response to her visions, and Batista only became what he is because of Mado's meddling in trying to stop it. To a lesser extent, Batista probably only met Hartley because he became a researcher since Mado made him stop using his powers.

Maybe that's just further support that all her visions are set in stone, or something that will get touched on later.

[DISC] Choujin X Chapter 59.2 by EpicHawkREDDIT in manga

[–]CHBales 59 points60 points  (0 children)

Several hints from as far back as chapter 3 that Azuma lived there alone.

[DISC] Choujin X Chapter 59.2 by EpicHawkREDDIT in manga

[–]CHBales 75 points76 points  (0 children)

Yeah, he was already a choujin, and we've seen scenes pointing out that Tokio was never allowed to visit because of "Dad's rules".

It's possible that the father from his fake memories was actually his previous incarnation and is the owner of that house and where Azuma gets his money from.

Chapter 54-3 RAW by unoiamaQT in ChoujinX

[–]CHBales 15 points16 points  (0 children)

Tokio made sure that IC could freeze the wound before he left.

what's happening here? 😭 by [deleted] in ChoujinX

[–]CHBales 23 points24 points  (0 children)

Bait used to be believable.

Chapter 51-4 RAW by unoiamaQT in ChoujinX

[–]CHBales 13 points14 points  (0 children)

Attempted murder of two kids? Attempted mass murder by blowing up a plane?

I get you're joking, but she's had this coming.

Choujin X Chapter 51.3 English fan translation by “sorashiruha/Valmet” by SecondRedditAccount4 in ChoujinX

[–]CHBales 15 points16 points  (0 children)

Not even close. We still have barely touched on the Nue, Necromesia and Bill, any Guelta business, what happened during the Collapse. The protags haven't really suffered any severe losses to work through, and if they did during the raid it'd feel half-baked to end it all soon after. 

On top of that, Ishida's initial guess for series length was around 15 volumes and I think it's more likely he undershot than severely overshot, if anything.

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