hybridfree/eevblog-posts huggingface dataset:
Picoammeter Design Problems - Page 1
Forum section: electronics / projects

author: dreaquil
author_rank: Regular Contributor
timestamp: October 09, 2015, 04:55:08 pm
content: A while back I posted asking about picoammeter design ideas and reference material.I designed a board using an LPC662. It's a feedback ammeter (looks like a low pass filter)Rf=10Gohm and C=47pF. For some reason my output is saturating positively. I've tried replacing the IC twice. The feedback resistor too. Place 45V and Ri=200k (which should make it saturate to ground pretty hard) but nothing worked. I'm supplying it from a 5V rail. BTW the non inverting input is actually at 4.096V to shift the signal up such that I can read it with a single supply. I then replaced it with its slightly lower performance cousin the LMC6462 and it worked fine! Any ideas?

author: Niklas
author_rank: Frequent Contributor
timestamp: October 09, 2015, 05:05:39 pm
content: Input common mode range. Vdd - 2.x V at 5V supply. Both inputs must be kept within the range defined in the datasheet.

author: dreaquil
author_rank: Regular Contributor
timestamp: October 09, 2015, 06:05:24 pm
content: Lesson learnt! Thanks a lot.
picoOhm variation sensor - Page 1
Forum section: electronics / projects

author: raphchev
author_rank: Newbie
timestamp: August 19, 2021, 02:21:39 pm
content: Hello;I am investigating a technique to detect breakage of a copper wire in parallel with a stainless wire.The idea was to measure resistance change; but the sensitivity required is around 2-10pΩ; that seems practically impossible, even with a four wire & a total resistance around 0.1Ω.But I was thinking, since the wire breakage is likely to be quick (hypothesis; switching from ON to OFF takes about 1ns), have you ever encountered a circuit that could sense that quick change in resistance? Maybe a four wire coupled with a capacitor to get rid of DC and let the change through?Best,R
PICTIC II gerber files - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: January 12, 2024, 07:57:23 am
content: Hi, I have a bunch of TIC units (5370, 5371, TAPR TICC, original TIC, etc) and I want to build a bunch of the PICTICII units. Did anyone ever convert the PICTICII ExpressPCB files to gerber output, possibly by using CircuitMaker, Altium, etc? If I can get the files, then I can order 10 boards for less than the cost of the one being sold on eBay and build them into a few devices and stave off my on boredom. Don't try to talk me out of it.I want to build the PICTICII to recreate some of Bill Riley's early timing projects. I remember reading where the PICTICII was capable of some decent resolution. KE5FX, "Notes on PICTIC II performance" had it at 680ps. Bill Riley had incorporated it into some of his DMTD designs and made his own TIC setup with a couple of them. I have the ExpressPCB files (schematic and PCB) but would prefer to get 5 or so boards made at JLC or Oshpark so I could build a few stand-alone timing setups. I know there are new designs bit I don't remember reading where any of the newer designs got down to 500ps or lower, could be wrong. I thought Riley got down lower using a 50Mhz or higher clock and 10 readings per second instead of 1PPS. If I end-up redrawing it, I'll probably use surface mount parts. I think some of the thru-hole components are no longer readily available.Thanks,Jerry
Pictures of a cheap low profile smd switch - Page 1
Forum section: electronics / projects

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 14, 2015, 05:22:12 pm
content: Hello!Switches are usually something were i only use high quality parts but i only needet a couple to test them out, i found a local ad on ebay selling these no name switches for a couple of bucks.Grain of salt for size comparison:http://shiosai.de/gallery3/index.php/Electronics/Cheap-low-profile-SMD-switchAfter taking one apart they might be not all that bad, if the metal dome holds up these might do nicely.The tape wich looks like capton seems to be capton, it does not melt at 350°C.But the body does not melt at 250°C and starts melting somewere around 300°C.I do not know how that translates to the probability to reflow solder them since i hand solder, no problem there.They are fully sealed, no problem with washing the board, the frame is moldet into the body and i could not break one with resonable force.But that is no indication how they perfom in the long runGreetings,Peter
Pictures of an Noisecom NC1105A and NC201 noise source - Page 1
Forum section: electronics / projects

author: matthuszagh
author_rank: Frequent Contributor
timestamp: September 08, 2023, 06:48:56 am
content: I received a non-functional Noisecom NC1105A 10 Hz to 10 MHz noise source. As part of the troubleshooting procedure, I took a few pictures of the interior assembly and diode. Hopefully others find this interesting. Sorry for the colors on the diode picture - I guess I need to play around with my camera settings - those aren't the real colors.

author: daqq
author_rank: Super Contributor
timestamp: September 08, 2023, 07:31:55 am
content: Okay, that's the strangest assembly in a mass produced professional device I have seen.

author: croma641
author_rank: Regular Contributor
timestamp: September 08, 2023, 09:44:55 pm
content: Mine, non-working (NC1105a)....

author: matthuszagh
author_rank: Frequent Contributor
timestamp: September 08, 2023, 11:08:36 pm
content: I made a mistake in that earlier picture. The close up is not the noise diode it's a tuning cap... The noise diode is the thing that looks like a diode in the lower left corner.

author: CaptDon
author_rank: Super Contributor
timestamp: September 09, 2023, 12:59:05 am
content: Why is this cross posted Beginners / Projects
pictures of static charge distribution on insulators ? - Page 1
Forum section: electronics / projects

author: SArepairman
author_rank: Frequent Contributor
timestamp: April 23, 2015, 07:26:28 pm
content: Does anyone have an example of some pictures that show static charge distribution along insulators?The idea being similar to showing current in a ground plane (as shown by mikes electric stuff), that is in this case to connect a surface electrostatic voltmeter to a light source, so the brightness of the bulb changes based on charge magnitude (and diff color for opposite polarity), and then to use a long exposure.(or just take measurements at every point and simulate it with software zzz)this is related to my other threadhttps://www.eevblog.com/forum/projects/measuring-static-charge-with-an-electrometer-19267/msg658822/#msg658822But anyway, pictures of actual professionally done mappings would be cool to see.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 23, 2015, 07:56:52 pm
content: I don't know, but dust seems to do a decent job inside old TVs.I think mappings, for example in vacuum tubes, were done by some weird mechanical computing process.http://www.google.com/patents/US2542478I saw a video, I'll try to find it. It was like this table full of pegs or something.

author: daqq
author_rank: Super Contributor
timestamp: April 24, 2015, 09:41:45 am
content: There's a free simulator that might be of use to you:http://www.femm.info/wiki/HomePage

author: SArepairman
author_rank: Frequent Contributor
timestamp: April 25, 2015, 07:30:20 pm
content: Quote from: daqq on April 24, 2015, 09:41:45 amI'm more interested to actually see it how it is, for curiosity purposes. It might be beautiful/trippy. O0
PID Control Systems Practice Question - Page 1
Forum section: electronics / projects

author: lordgarth6
author_rank: Newbie
timestamp: May 09, 2017, 05:15:23 pm
content: Hi guys not sure where this belongs in the forum, but iv got an exam coming up and i need to really understand how PID control systems work and how to derive there functions.I just dont know how to start with this question, any help would be appriciated
PID controller for bench power supply - Page 1
Forum section: electronics / projects

author: electros6
author_rank: Regular Contributor
timestamp: May 06, 2013, 01:39:04 pm
content: Sir ,I am s big fan of yours. you are my roll model .I recently designed a bench power supply based ofPIDcontroller . I got the PID parameters using close loop tuning. Every thing works fine expect , that the settling time is around 1sec , but the settling time for the agilent E3210A is around 700ms. please somebody help me to increase the settle time. I used atmega8 microcontroller and LT8030. I change the sampling time but does not yield any result. Please help me

author: Korken
author_rank: Regular Contributor
timestamp: May 06, 2013, 01:47:21 pm
content: The best thing to do is to measure the transfer function of the system and after that to use Matlabs PID-tuning toolbox.Then you can directly see if what you want is possible and what effect noise will have.Regards, Emil
PID Controller for Piezoelectric Actuators - Page 1
Forum section: electronics / projects

author: rockbassist90
author_rank: Contributor
timestamp: December 10, 2014, 09:43:14 pm
content: I understand a brushless motor (DC) is analogous to an inductive loadand a piezo is that to a capacitive load...This servo amplifierhttp://www.copleycontrols.com/Motion/pdf/Accelnet_MACRO.pdfI've used for various applications with Brushless motors and it uses a three phase PWM inverter that converts the bus voltage into a sinusoidal waveform to drive the motor coils.Since the piezo is capacitive load...this would obviously short circuit the drive...how should I tackle this problem with a 4 phase piezo motor?Scratching my head on this one.
PID controller for seed germination (replace ebay Rex C100) - Page 1
Forum section: electronics / projects

author: FrankE
author_rank: Regular Contributor
timestamp: January 12, 2019, 05:30:19 pm
content: It's seed germination time again and I found one of my heated bed temperature controllers has a Rex C100 PID controller with dead display. The PID Cx'er is also putting out 183V a.c. to the 40A SSR which is rated at 3-32V d.c. Oh well, it lasted a couple of seasons.I think I may have left it switched on open load.The heated beds are polystyrene leek boxes with the long sides cut off, joined together, a bottom liner inserted, a soil warming cable buried in sharp sand and a top liner to keep growing media out of the sand. They each take a 60cm by 40cm commercial eurotray. (sorry don;t have a digital camera). The thermocouple probe is poked in one of the cells to sense actual soil temperature rather than the bed temperature. Those keep rusting to hell and the threaded part is a pest.I'm looking for better quality components before I commit to proper enclosures and more flame retardant base.The Ebay Berne Rex-C100 controllers I understand are a rip off of ones made by RKC Instrument Inc (Japan)I had a look inside and it's not worth my time or risk making up mains croc clip leads a a a jig to faultfind on it.Are the actual RKC ones a different design and more reliable?Any good value models of PID controller? I'm looking at Omega but they're quite expensive for my budget.
PID for a heat treat furnace. - Page 1
Forum section: electronics / projects

author: Housedad
author_rank: Frequent Contributor
timestamp: April 28, 2020, 03:51:57 am
content: I have a Neycraft Jff-2000 heat treat furnace. It is an all manual 120v model and reaches a maximum of 2012F(1100C). I think I've had it for about 25 years. Still works like new.https://www.ottofrei.com/Neycraft-JFF-2000-Fiber-Furnace-Chamber-Size-9-W-X-9-D-X-6-1?quantity=1&custcol_of_option_voltage=7I am going to put a PID controller on it. I was thinking about using a basic PID since all I need is to be able to set ramp up, soak, and ramp down for basic heat treating. It is a pain in the butt having to manually monitor this thing every time I use it.I was thinking of using one or the small ones from Automation direct, but I wondered if any of you had a recommendation for a better and/or preferably cheaper one that won't go bongo in the first try. The prices on some of the Ebay ones are so low that it scares me to even try them.Thanks

author: Kleinstein
author_rank: Super Contributor
timestamp: April 28, 2020, 07:25:25 am
content: Temperature controllers are build in large numbers in China. So they can be OK even for a low price.For the high power consumption one may be a little careful with the current rating - Chinese products tend to go really to the edge with the claimed capacity, sometimes only valid for a short moment. This would be the main tricky point. Some may need an external solid state relay or contactor similar - this may be the safer way with respect to power rating. There may already be a contactor as part of the original furnace.The other is to check if they support the temperature sensor.

author: wizard69
author_rank: Super Contributor
timestamp: May 02, 2020, 09:12:39 pm
content: Quote from: Housedad on April 28, 2020, 03:51:57 amCarefully select the PDI controller, many of the extremely cheap ones will require a 24VDC supply. Also if you are going to implement your own control system you really should have a separate high temperature limit controller of some sort. The PID controller will also require a high current switch, which might already be in the oven already; however you need a PID controller that can drive that old relay.QuoteRamp Up, Soak, and Ramp down are not basic functions. If you want controlled cycles you will need to make sure the controller actually supports the features you want in the way you want. Frankly many of the cheap processor controllers are a bit of a pain to program, so you might want to look for easy of use features.QuoteIf you want to control costs I'd look at the various ARduino projects out there. You then get extreme flexibility for setting up you ramp/soak cycles. If not DIY then there are dozens of possibilities form the likes of Omron, Watlow, Omega, Automation direct and many others.
PID Tuning in Self Balancing Bot - Page 1
Forum section: electronics / projects

author: sagnikbasu
author_rank: Contributor
timestamp: March 08, 2017, 05:26:57 pm
content: Hi,So I made a self-balancing bot and tuned it perfectly with a PID control loop.The problem is that as soon as I change the battery, the Kp, Kd, Ki constant changes and I need to tune it again.I know that it is due to change in motor characteristics due to change in battery voltage.So is there a way I can resolve this problem i.e. I do not want to tune the bot again as soon as I replace or recharge my battery.Thanks for your help.

author: Jeroen3
author_rank: Super Contributor
timestamp: March 08, 2017, 05:42:28 pm
content: You can create a P(Vbat) relation and change the pid settings automatically depending on battery voltage.Or create a more constant motor drive.Or, pid auto tune. However, with an unrecoverable system, this can be conplicated. Eg: you can't stop pid and expect a safe condition. It will fall over.

author: kosine
author_rank: Regular Contributor
timestamp: March 08, 2017, 05:50:05 pm
content: Maybe use a voltage regulator to ensure the motors are always at the same voltage level?(I've only used PIDs for heater control systems, which are fairly slow. Even then, optimising the settings can be tricky at times. High speed PID sounds even harder to get right!)

author: ajb
author_rank: Super Contributor
timestamp: March 08, 2017, 06:15:13 pm
content: Rather than adjusting the PID constants in relation to the battery voltage, you should be able to scale the drive signal (the output of the PID loop) to the motors in relation to the battery voltage. Higher battery voltage->smaller drive signal for a given PID state. Done properly, this should give you a constant relationship between the drive signal from the PID and the motor torque.Another option would be to regulate the motor current and have the output of the PID loop control the setpoint for the current loop. Obviously this requires additional hardware that you may not have in your robot, but it eliminates the battery voltage from the equation--as long as you design the system to operate effectively even at minimum battery voltage, since this will affect the possible current drive range. The current loop doesn't even necessarily need to be PID--a simple threshold detector that steers a PWM signal can be effective, if it's fast enough, and comes with dithering built-in. More advanced implementations could use an MCU's DAC and analog comparator peripherals to implement a comparator-based current loop. See app notes for MCU-based switching converters for some hints.

author: nctnico
author_rank: Super Contributor
timestamp: March 08, 2017, 06:47:38 pm
content: Aren't self balancing things Kalman filter territory?
PID Tuning Spreadsheet - Page 1
Forum section: electronics / projects

author: Bootalito
author_rank: Unknown
timestamp: October 30, 2017, 05:42:49 pm
content: I developed this tool a while ago and thought I'd share. This is a spreadsheet that I use to tune PID loops, specifically the PID ladder logic function block in Allen Bradley PLCs. There is lots of software that can automate this (TuneWizard is another I use), however for a quick PID tuning job that gets it 95% optimized (really all you need for most industrial control) this spreadsheet is pretty much all I use.https://www.dropbox.com/s/m4czdt3ex253z0b/PID%20tuning.xlsx?dl=0A couple of notes:1. The PID parameter units are in minutes not seconds (because AB's PID block was programmed that way).2. The PID parameters calculated are for the dependant PID equation, whereas most people are used to Independant equation, or Velocity Form as in ABs PIDE function block. There is a little converter section in the spreadsheet to go between the two. Arguably the Dependant equation is better, but Independant is easier to understand. If anyone is interested I can explainI haven't tried using it to tune many things that are not ABs PID function block, however with a little tweaking it would work fine, as the math is all there. For example, if you wanted to tune a loop using the arduino PID library (https://github.com/br3ttb/Arduino-PID-Library), you would want to do two things: 1. In the Closed Loop Tuning Method get rid of all of the "/60"'s in I and D. 2. Whichever parameters you want to try use the "Independent / Dependent Conversion" table on the right to convert to Independent, and I can almost guarantee that the numbers will work as I've studied that library with the intention of using it for some projects, and its sound.

author: windsoul
author_rank: Newbie
timestamp: December 16, 2021, 04:17:50 am
content: the file has been deleted. Could you please update it?thx

author: sorin
author_rank: Frequent Contributor
timestamp: December 17, 2021, 02:46:27 pm
content: Im not the author, but I saved it my pc.
Pierce Oscillator Simulation - Page 1
Forum section: electronics / projects

author: aliedot
author_rank: Newbie
timestamp: December 10, 2018, 02:51:38 pm
content: Hello all,I am super new in Analog Design field and I have a lot of problems understanding how things work with Cadence and sometimes with electronics.I have to simulate the start-up of a Pierce Oscillator with Cadence, but I don`t know what this thing means for the circuit itself.Thanks!

author: ogden
author_rank: Super Contributor
timestamp: December 10, 2018, 03:34:21 pm
content: Quote from: aliedot on December 10, 2018, 02:51:38 pmhttp://lmgtfy.com/?q=pierce+oscillatorhttps://en.wikipedia.org/wiki/Pierce_oscillatorBe my guest!

author: Zero999
author_rank: Super Contributor
timestamp: December 10, 2018, 04:49:35 pm
content: Cadence? Yuck. I hate that software. I have it installed at work. I used it for a couple of projects, just layout, not simualtion and didn't get on with it. The user interface is very clunky.For simulation, I've always used LTSpice.

author: iMo
author_rank: Super Contributor
timestamp: December 10, 2018, 04:57:36 pm
content: ..and you may find Clapp/Colpits/Pierce in the LTSpice examples..

author: aliedot
author_rank: Newbie
timestamp: December 11, 2018, 08:19:38 am
content: It is mandatory to use Virtuoso.

author: aliedot
author_rank: Newbie
timestamp: December 11, 2018, 08:21:48 am
content: I don`t know what parameters I need to modify in the circuit to have a start-up behavior.
Fast ZVS Mazzilli Driver (mod for high frequency&voltage) - Page 1
Forum section: electronics / projects

author: Neukyhm
author_rank: Contributor
timestamp: December 22, 2018, 05:26:51 pm
content: Do you want higher voltage with your transformer (e.g. TV flyback)? Just make your primary with less inductance (less turns). But you will see that the original Mazzilli driver will have to work at higher resonant frequency, and it may fail. This version of the Mazzilli driver solves this, allowing higher frequencies so you can make your primary with much less inductance and increase the output high voltage. Also because the switching is done by IC, it's much faster and the Mosfets will pass the ohmic region quickly so they will be colder.I put a dual Mosfet driver in the middle and now the circuit is much faster at switching, allowing higher frequencies and voltage. This is great since the original circuit have some 470ohm resistors that make the gate charging processveryslow.Thebenefitsyou get using this are:-Higher DC voltage input-Higher AC voltage output (because you can make a primary with less turns)-Colder Mosfets, because the switching is very fast-Higher frequency-Lower primary resonant current-Negligible power lost through the UF4007I designed this because I had to drive my custom HV ETD59 gapped core for the X-Ray machine, but my primary's inductance was so low (3+3 turns) and my caps so small (136nF) that the resonant frequency was 110kHz. The original ZVS driver just blows up the Mosfets (true story).I think this can be very useful for those of you that want to build a high voltage transformer and don't know how to drive it. Hope you like it.

author: flyrod
author_rank: Contributor
timestamp: December 23, 2018, 10:39:33 pm
content: Thanks for sharing your design! How did you pick your driver IC? Would any CMOS input driver work for this?Also, did you record any waveforms of the input or output of the gate drive? The tank waveform looks like it has some parasitic oscillations maybe.
Piezo Buzzer Driver Coil - Page 1
Forum section: electronics / projects

author: ripper121
author_rank: Contributor
timestamp: November 29, 2017, 03:08:59 pm
content: Hello,maybe somebody can help me.I'm searching for a 3 Pole (Pin) Inductor / Transformer / Coil to drive a Piezo Buzzer.I find dem in each device with a Piezo buzzer but cant find them on Mouser or digikey.I dont want to order them from a chines company via alibaba etc.

author: Zero999
author_rank: Super Contributor
timestamp: November 29, 2017, 06:35:32 pm
content: Normally, a simple inductor is all that's needed. The high voltage pulse given off when the current through the inductor is interrupted, is enough to drive the piezo.My guess is what you have is an audio impedance matching transformer, to make the piezo work in a circuit designed for an 8 Ohm speaker. You probably need an 8Ohm to 500Ohm or 1k audio transformer. Mouser sell them, but they're expensive.http://www.mouser.com/ds/2/449/Yuetone_XC-600127-1212403.pdfhttps://www.mouser.co.uk/ProductDetail/Xicon/42TL001-RC/?qs=sGAEpiMZZMv0IfuNuy2LUQ0m87amfyq2uA7H6bdvrrM%3d
Piezo buzzer driving range - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: August 13, 2024, 12:32:59 pm
content: Hi,I am using a piezo buzzer Part number PKLCS1212E4001-R1 and datasheet here:https://www.murata.com/products/productdata/8801054490654/SPEC-PKLCS1212E4001-R1.pdfIt says it is +/- 12Vpp so I always drove it within that range. But in a new design it would require driving with 24V pulsed DC to avoid having to modify the PCB. And I came across some online suggesting that might be ok. And Digikey (surely not to be prioritized over the datasheet specs) says 25V which I have no idea where they got that value (it is not mentioned in the datasheet):https://www.digikey.co.uk/en/products/detail/murata-electronics/PKLCS1212E4001-R1/1219314Thinking about a piezo, the moment the phase is inverted it has a voltage across it twice the previous voltage, so I assume that is ok. But then again there might be other constraints I am not aware of?Does anybody know?If it cannot be driven with pulsed 24V DC then can I use a simple Zener diode to limit the voltage across it? If so how do I figure out the maximum current needed by the piezo so I can size the zener resistor? On the datasheet it does not show any impedance value.Thank you

author: Xena E
author_rank: Frequent Contributor
timestamp: August 13, 2024, 02:30:31 pm
content: It won't be an overvoltage problem, it may be a mechanical excursion issue though, if you need to, just drive one on soak test for as long as you feel necessary.If you want to reduce the drive, a series resistor equal to the reactance of the piezo at the drive frequency could be used. That should give you your 12VRegards,X

author: Zero999
author_rank: Super Contributor
timestamp: August 13, 2024, 03:13:17 pm
content: 24V pulsed DC, is really 12V+/-12V peak. If you're really paranoid, you could put a capacitor in series and a high value resistor in parallel withe the piezo to get +/-12V peak, without the DC.

author: ricko_uk
author_rank: Super Contributor
timestamp: August 13, 2024, 09:33:35 pm
content: Thank you both,Quote from: Xena E on August 13, 2024, 02:30:31 pmhow do I find the reactance? There is no impedance, resistance, reactance or other value on the datasheet.Thank you

author: Xena E
author_rank: Frequent Contributor
timestamp: August 14, 2024, 09:06:14 am
content: Find out or measure the capacitance value of the sounder.Calculate the reactance at the drive frequency from that.In the event you use Zero999 (better) suggestion, you could just put a (say) 100kΩ resistor across the sounder and empirically decide on a value for the capacitor, checking the voltage across the sounder on your scope, the value will probably equal that of the piezo, normally a few nanofarads upward, (I quickly skimmed the link you gave but didn't see a value).

author: ricko_uk
author_rank: Super Contributor
timestamp: August 14, 2024, 03:38:59 pm
content: Thank you
Piezo Buzzer FT-27T-4.0A high frequency sound using AC voltage PWM? - Page 1
Forum section: electronics / projects

author: eneuro
author_rank: Super Contributor
timestamp: June 12, 2014, 07:37:21 pm
content: Hello,I've this piezo buzzer FT-27T-4.0A and I know how to connect it and get it working using AVR PWM & DC voltage.However, never tried to power it using AC wave voltage.It's datasheethttp://www.tme.eu/en/Document/5efc6c01301bc57aa7b1c90e0dc3e4ac/ft-27t-4_0a1.pdfin technical terms shows only something like this:QuoteI saw how this stuff is soldered in hidded black resonant boxes and (+) red wire is attached to the center and (-) black to bigger ring, so it suggests that polarity counts.Is it possible to power it using eg. +/- 5VAC(sinus wave) ?I could have maybe better dynamics of high frequency sound if negative polarity applied, but unsure what this datasheetInput Vp-p 30maxmeans while there is nothing about polarity?Update:OK too many hours spend and you forgot that you have to go to the origins sometimesThis nice intro to piezo buzzersPiezoelectric Sound Componentsexplains AC impacts on piezo elements, so never mind-everything is clear nowIt is time to test my artificial bat sonar AVR project
Piezo Cylinder Driver  - Page 1
Forum section: electronics / projects

author: Aluz
author_rank: Newbie
timestamp: April 26, 2024, 09:21:52 pm
content: Hello I'm looking to use piezo cylinder transducers in an underwater lens cleaning assembly part of a probe. The assembly is complete but I need a bit of help with the driving electronics. There's no suggested voltage from the manufacturer or reference circuit, but the entire device is 12v that can be boosted for the piezo driver if needed. Any help with a compact circuit would be much appreciated!https://www.steminc.com/PZT/en/piezo-tube-22x20x10mm-180-khzPart Number: SMC22D20H10412Piezoelectric Ceramic Cylinder. Circunferencial vibration mode.Piezo Material: SM412Dimensions: Ext. Diam. 22 x Int Diam 20 x Height 10mmResonant frequency fr: 180 KHz±2 KHzCs tanδ => LCR meter at 1KHz 1Vrmsfr Zr fa Keff Cs tand(KHz) (W) (KHz) (%) (nF) (%)158.35 2.95 181.63 48.97 11.05 0.94Applications, among others, are: Piezo transducer used for vibration, sensing, matter dispersion, biomedical probes, sonar, Hydrophone

author: moffy
author_rank: Super Contributor
timestamp: April 27, 2024, 01:18:17 am
content: The excitation voltage, depends on the amount of movement you need for your lens cleaning, which depends upon the piezo shape and material as well as your mechanical coupling and damping. So you are basically driving an 11nF capacitor which will look more resistive the more energy is absorbed mechanically, can't say how much you need because it is specific to your setup and requirements. You do need to get from the manufacturer a maximum allowable voltage for your piezo and then just try a signal generator and a high voltage amp for piezos and work out what you need to drive the cylinder at. Once you have those figures you know what to design.

author: Aluz
author_rank: Newbie
timestamp: April 30, 2024, 10:10:16 pm
content: Thank you, I checked with them and they said 80v max pulsed. I have a signal generator but not one that has a voltage that high, how can I connect this to a high voltage amp and how do I build the high voltage amp. All piezo specs are in my last message, setup and requirements are not too important I'm just looking to do a quick bench test.

author: DenzilPenberthy
author_rank: Frequent Contributor
timestamp: April 30, 2024, 10:56:41 pm
content: I've used modules from these folks before. They worked well and were super easy to integrate into our application.https://www.piezodrive.com/modules/Other than that, there is a circuit diagram of a piezo driver somewhere in Art of Electronics that I've used before. You will have to add a 12v to 100 ish V step up switch mode converter to power it. But you will probably find an off-the-shelf module to do that.I had a quick google to see if I could find the AoE circuit for you and it lead me straight to my own forum post from long ago (which I'd totally forgotten about) where I asked basically the same questionhttps://www.eevblog.com/forum/projects/0-to-100v-piezo-driver-ideas/I remember using the Apex high voltage op-amps in one project and they worked Ok but were pricy and hard to get hold of (might be long since obsolete by now).
Piezo driver DRV2700 - Page 1
Forum section: electronics / projects

author: CB4324
author_rank: Newbie
timestamp: March 13, 2025, 09:59:08 am
content: Hello everyone,I found on internet a TI piezo driver (DRV2700) with Flyback Converter and I want to control a piezoelectric device with an 800V power source that I already have. What I like about this driver is its fast charging feature. My question is: how can I achieve the same fast discharging feature with my power source to control my piezoelectric device, similar to the DRV2700 driver?Thanks
piezo driver with DAC81404 - Page 1
Forum section: electronics / projects

author: calvingloster
author_rank: Regular Contributor
timestamp: June 22, 2023, 01:06:09 am
content: HiI am in the process of designing a PCB that will drive a piezo transducer that is split into 4 quadrants. The piezo transducer will move an atomically sharp tip to probe the surface of a specimen whereby a preamp circuit will measure and amplify the tunneling current when the tip gets close to the sample.The idea is to scan the sample in an X Y pattern to build up a height map of the surface.My question is will the DAC81404 be adequate to directly drive the piezo transducer or will I need an additional power stage after the DAC? The piezo transducer is a general use 25mm diameter piezo disk used in cheap piezo buzzers. The piezo transducer has a capacitance of 25000pf at 1khz and a resonant impedance of 500ohms. The DAC has an output stage that specifies a load current of 15mA when Avdd is > 5.5v. now I'm not sure if this is the correct spec to be looking at? I know that the faster I drive the piezo the more current it will require. How would I go about calculating ho much current the DAC will need to supply if Avdd is a bipolar 15v supply and I want to do 100hz scanning.I would like to scan as many points /second as possible but would be happy with even 100hz scanning rate. This is the first design cycle of this thing I'm building so I plan to get it working to some degree and then start refining it.

author: calvingloster
author_rank: Regular Contributor
timestamp: June 24, 2023, 05:55:41 am
content: If the piezo element is divided into 4 quadrants is it safe to assume the capacitance is 1/4 per quadrant?
piezo sensor design - Page 1
Forum section: electronics / projects

author: marconat
author_rank: Newbie
timestamp: May 06, 2014, 12:09:59 pm
content: hello,I am a student who is doing a piezo microphone design,could you tell me how to calculate the dynamic voltage produced by a piezo hit by a sound wave, which we assume is sinusoidal type * sin (kx-wt)?

author: marconat
author_rank: Newbie
timestamp: May 06, 2014, 12:11:12 pm
content: /Users/marconatali/Desktop/Foto del 06-05-14 alle 13.19.jpg

author: marconat
author_rank: Newbie
timestamp: May 06, 2014, 12:12:40 pm
content: this is my problem
Piezo transducer voltage - Page 1
Forum section: electronics / projects

author: trevwhite
author_rank: Frequent Contributor
timestamp: September 01, 2013, 03:42:20 pm
content: Hi, I have been looking through some data sheets on piezo transducers and they state 30V pk-pk. I was wondering what defines this? I am trying to find some really loud piezos but they all seem to have standard datasheets. Is it safe to over-drive them voltage wise?This is an example of the type of piezo I have been looking at.http://uk.farnell.com/murata/7bb-35-3/sounder-2-8khz-ext-drive/dp/1192552CheersTrev
piezoelectric as digital input for arduino - Page 1
Forum section: electronics / projects

author: hussamaldean
author_rank: Unknown
timestamp: December 06, 2018, 05:34:07 pm
content: Hi all,I have an awesome project which require to use piezoelectric and I want to use it as digital input rather than analogwhat type of circuit requires to achieve such thing ?schmitt trigger, op-amp or comparator ?thanks in advance

author: DaJMasta
author_rank: Super Contributor
timestamp: December 06, 2018, 07:30:08 pm
content: What output are you looking for from the piezo sensor?The basics would be an amplifier, you can just take the tiny analog output and amplify it a couple times until it's big enough to trigger a digital input, but you may want to then have a comparator with a set threshold to clean up the reading, or something else depending on what you're trying to use it for.

author: Ian.M
author_rank: Super Contributor
timestamp: December 06, 2018, 08:41:23 pm
content: Take a look at the JFET buffer circuits I suggested for Piezo sensing applications back in 2010 over on the Microchip forums:https://www.microchip.com/forums/m480518.aspx

author: hussamaldean
author_rank: Unknown
timestamp: December 07, 2018, 02:48:01 am
content: Quote from: DaJMasta on December 06, 2018, 07:30:08 pmI want to use it to detect a door knock while maintaining the performance of the interrupt (the requirement requires to use interrupt )

author: JuanGg
author_rank: Regular Contributor
timestamp: December 07, 2018, 12:47:06 pm
content: QuoteYou may want to add some filtering before the comparator, so the interrupt doesn't get trigered several times on the same knock, or you could add some software debouncing. Also, it is a good idea to add a rather high value bleeder resistor to discharge the capacitance of the piezo, and some protection diodes as this things can generate high voltages.

author: t1d
author_rank: Super Contributor
timestamp: December 07, 2018, 01:32:02 pm
content: There are DIY projects using piezoelectrics as the input trigger for digital percussion drum musical instruments. Google circuit images and check YouTube. There are lots of these projects out there and they should be very similar to your application.

author: hussamaldean
author_rank: Unknown
timestamp: December 07, 2018, 02:59:15 pm
content: Quote from: JuanGg on December 07, 2018, 12:47:06 pmwell, I got 1N4148 and 2N3819 and see what will happen

author: hussamaldean
author_rank: Unknown
timestamp: December 09, 2018, 02:01:49 pm
content: Hi allI ended up using analog pin with do while loop and other routinesthx for the advices though and I am sure they will be helpful soon
Piezoelectric Force Sensor Testing - Page 1
Forum section: electronics / projects

author: gregolive
author_rank: Newbie
timestamp: March 07, 2018, 05:51:47 pm
content: Hello,I am working on a project where I am using piezoelectric force sensors and logging the data on a Teensy 3.6 micro-controller. I am currently testing the sensors at a drop tower and have a question about the results. When testing at lower loads (~700N) the force sensor performs as expected with a spike upwards at impact (see attached photo), however at higher loads (~1800N) the spike goes slightly up, but mostly down at impact. Has anyone experienced this before? Thanks for the help!

author: rhb
author_rank: Super Contributor
timestamp: March 08, 2018, 02:52:49 pm
content: Post some photographs of the setup for both cases. A wild guess is that the larger load is deflecting the sensor support. But that's all it is, a wild guess.

author: Ian.M
author_rank: Super Contributor
timestamp: March 08, 2018, 04:22:52 pm
content: Your Teensy data logger doesn't have a high enough sample rate to see what's actually happening. Can you capture the spikes at a much faster timebase using a DSO so we can see more detail?Also, in addition to the photos rhb requested, the schematic of the signal conditioning circuit and datasheet of the sensor would be helpful.
Piezoelectric inquiry - Page 1
Forum section: electronics / projects

author: larangel3
author_rank: Contributor
timestamp: January 03, 2016, 01:32:08 am
content: I am currently working on a device which has to store and update data, and such data must be transferred from the device to a computer through a wireless interface.My question is: Is it possible to power such a device using piezoelectric energy or any other energy harvesting method?Edit: The piezo would replace the need for a battery, the device is fairly small, not bigger than 2.5cmx3cmx1.5cm. And the longest duration would be the time it takes to transfer the information from device to computer, so about a minute.Light is a variable not included, neither is temperature.Power consumption would be less than 1mA.

author: Audioguru
author_rank: Super Contributor
timestamp: January 03, 2016, 02:46:01 am
content: We do not know how much current your wireless circuit uses and for what duration. Maybe you need a huge sidewalk covered with piezo transducers and many elephants walking on them to produce the power you need. If there is light then a solar panel will provide some power. Wind? Flowing water? Heat?

author: larangel3
author_rank: Contributor
timestamp: January 03, 2016, 03:33:10 am
content: Quote from: Audioguru on January 03, 2016, 02:46:01 amPost edited.

author: Audioguru
author_rank: Super Contributor
timestamp: January 03, 2016, 03:42:30 am
content: Now you say it uses 1mA. A piezo transducer produces high voltage but extremely low current.Maybe if you use many large piezo transducers and flex them all a lot at the same time they can produce 1mA. Use the transducers to drive a rectifier bridge that charges a capacitor that stores the power.

author: TMM
author_rank: Frequent Contributor
timestamp: January 03, 2016, 01:45:34 pm
content: The duty cycle and voltage of the activity would be useful to work out if its a feasible project. For example, 1mA @ 3.3v for 1min once a day and harvesting for the rest of the day is much more feasible than 1mA @ 20v for 1min every 3mins.Sent from my Nexus 5 using Tapatalk
Piezoelectric transducers length/width? - Page 1
Forum section: electronics / projects

author: Shocker
author_rank: Contributor
timestamp: December 15, 2015, 04:17:26 pm
content: Hi,I'm wondering what the length/width of a piezoelectric transducers indicates? And if there were any equations that relate the dimensions to what ever it might be.The thickness indicates the resonant frequency of the transducer. The thickness also indicates how much voltage the transducer will tolerate. So i was wondering if the length/width of the transducer indicates current capabilities?Thanks.

author: dmills
author_rank: Super Contributor
timestamp: December 15, 2015, 07:59:15 pm
content: If only it were that simple....Any piezo transducer has multiple possible operating modes, and thickness mode is only one of the many possibilities (And not actually all that common in reality).http://www.morgantechnicalceramics.com/products/product-groups/piezo-ceramic-components/piezoelectric-ceramics-prop-appsIs a good introduction to the range of possibilities.Regards, Dan.
piezofan driver circuit (60khz 110V)? - Page 1
Forum section: electronics / projects

author: SArepairman
author_rank: Frequent Contributor
timestamp: December 27, 2013, 12:27:28 pm
content: So I have a piezofan that I bought a while back,http://www.steminc.com/PZT/en/piezoelectric-fan-blade-60-khzI want to make a little driver circuit for it, my thoughts go like this:LDO (with voltage adjust) (or possibly a boost converter to run it off batteries) > 555 timer making a 60khz 50% duty cycle square wave (w/ fine frequency tune) > NMOS transistor > ATX power supply transformer > Piezofan (at 110V)I never used a piezoelectric device before, I would like to make sure this is typically how a driver for them works.How is it typically done without magnetics though... like line powered?and any idea on what the power draw of these types of fans might be?

author: DTJ
author_rank: Super Contributor
timestamp: December 27, 2013, 01:04:50 pm
content: I know SFA about piezo fans, but perhaps this link may assist:http://www.piezo.com/prodfan3lv02.html

author: SArepairman
author_rank: Frequent Contributor
timestamp: April 22, 2015, 06:10:34 pm
content: BUmp. Btw, it IS 60KHz, they have a typo on their website. They also sell a 60 Hz version, but I got the 60KHz version.60KHz 110V. The two ideas that I have are1)a) Use a power op amp (LT1010 20MHz unity gain buffer (used to buffer wein bridge), OPA550/551 audio op-amp, used to form wein bridge) in order to generate a medium level 60KHz signal.LT1010 = 44 VppOPA551 = 60 Vppb) Connect single ended output to a step up transformer and tune gain of wein bridge circuit so the output is 60KHz @ 110Vrms as stated in the data sheet.c) connect piezofan directly to transformer taps2)Tuned circuit?I measured the piezofan circuit (the piezo element +10k series resistor is all there is on the PCB) in a LCR meter (DE 5000) and I got the following parameters @ 100KHzLseries = 5.62uHCseries = 4.68 nFD = 26.1Q = 0.034ESR = 9.82 kohmPhase shift = -2 degreesCparallel = 5.63 nFRprallel = 9.839 kOhmRs = 9.82 kOhmCan I use an adjustable inductor in order to tune the circuit to oscillate at 60Khz and generate the appropriate gain?
Pillar drill motor control - Page 1
Forum section: electronics / projects

author: cleanworkbench
author_rank: Regular Contributor
timestamp: August 24, 2019, 07:39:50 am
content: I,m looking into the idea of changing out the original single phase motor on my pillar drill to something controllable in variable speed. What type of controllable motor should i be looking at for this application.Thanks

author: MosherIV
author_rank: Super Contributor
timestamp: August 24, 2019, 08:00:55 am
content: QuoteWhy? Is it broken?Does the pillar drill have a set of different size pullies and belt inside?http://pillardrillmachine.weebly.com/the-pillar-drill.htmlThe pullies and belt are there to allow you to change speed/torque.I doubt you will be able to easily replace the single phase AC motor for a DC varible speed one.I do not think anybody makes DC motors in that power range.I am not awear of any single phase AC motor inverters, as far as I know you can only get 3 phase motor inverters.

author: mzzj
author_rank: Super Contributor
timestamp: August 24, 2019, 08:32:28 am
content: Quote from: cleanworkbench on August 24, 2019, 07:39:50 amDepends a lot on your drill size but I replaced the orginal weakling and POS belt drive in my drill press with 1.5kW 1500rpm 3-phase AC motor and VFD.Belt set to 1:2 speed reduction gives enough torque to drill 25mm holes or tap M16 to steel and max spindle speed of 2200rpm when VFD set to 150hz

author: mikerj
author_rank: Super Contributor
timestamp: August 24, 2019, 11:07:54 am
content: As mzzy says, the way forward for variable speed machine toos is a 3 phase motor and a variable frequency drive (VFD). Small VFDs are now quite inexpensive and a suitable motor should be easy enough to find.
Pilot Wire on electric bathroom heater - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: February 28, 2022, 11:45:36 am
content: I have a bathroom that (will) have a Thermor Riva 4 electric heater. The unit comes with a 'pilot wire', which I understand is a kind of external control of the device. I was wondering if this is a standardised thing? I'm looking at the potential of making my home a bit smarter in the future and it would be nice if I can do this with this heater.
Pimoroni Square TFT - Page 1
Forum section: electronics / projects

author: davorin
author_rank: Unknown
timestamp: May 14, 2020, 08:58:54 am
content: Good morningI have some Pimoroni Square 4.0" 720x720 displays....For a project I would like to use just the TFT, which seems to be a RGB parallel type with capactitive touch...Does some know what TFT is used in this display kit?I opened up a display to see some manufacturer information...but nothing to be found...Or does someone knows of other TFT square display with 4" diagonal dimension?thanks in advancedavorin

author: dave j
author_rank: Regular Contributor
timestamp: May 14, 2020, 09:27:16 am
content: I don't know what TFT they use but they have thesource to their initialisation code on github. Knowing which Pi GPIO pins do what and that code should allow you to rig up something to allow you to drive it from something else. You might be able to figure out the display controller from the list of commands in the driver.

author: davorin
author_rank: Unknown
timestamp: May 14, 2020, 09:31:23 am
content: Well the problem is not how to drive it...that is clear....I need it for a project the same TFT or a similar type so I can do an own PCB design for it....So far I've only found a Sharp TFT which is smaller (around 52mm x 52mm display) but has a resolution of 2160x2160 (o;