hybridfree/eevblog-posts huggingface dataset:
SI2306 - MOSFET - Page 1
Forum section: electronics / projects

author: Nikos A.
author_rank: Regular Contributor
timestamp: December 22, 2019, 03:04:30 pm
content: Hi guys,I want to use an n-channel to drive a buzzer (both datasheets are provided below). I supply Vgs=5V and the same voltage is supplied for the buzzer. The problem is that the buzzer does not activated.. From the power supply, it's shown that the current drawn is 10mA (not enough to drive the buzzer), it's like the FET cannot provide more current but I do know the reason... I measured the Rds ON to be sure that the gate is ON for positive Vgs and everything was ok. I am not sure i something is going wrong with the Vgs and Vds but looking the curves I couldn't find something. Thanks in advancehttps://eu.mouser.com/datasheet/2/427/73234-241319.pdfhttps://eu.mouser.com/datasheet/2/670/cmi-9705-0580-smt-tr-1627912.pdfThis is the test circuit

author: Siwastaja
author_rank: Super Contributor
timestamp: December 22, 2019, 03:14:52 pm
content: Measure the voltage across the buzzer with a multimeter to verify the power supply, MOSFET operation and wiring in one go.Test if the buzzer works by directly connecting to the 5V supply.

author: Nikos A.
author_rank: Regular Contributor
timestamp: December 22, 2019, 03:43:58 pm
content: I am a super idiot... I didn't thought that the buzzer has polarity and the datasheet otherwise the mitered corner, mention nothing about polarity...It works fine now, thanks!!

author: Siwastaja
author_rank: Super Contributor
timestamp: December 22, 2019, 09:31:12 pm
content: Glad you found the issue - not all similar buzzers are sensitive to polarity, some work just fine either way.Though, the datasheet does have it multiple times: (+) and (-), and "POLARITY PAD(+)", "POLARITY PAD(-)".

author: Nikos A.
author_rank: Regular Contributor
timestamp: December 23, 2019, 05:16:21 am
content: I didn't noticeI have to be more carefull. Thank you for your assistance

author: Zero999
author_rank: Super Contributor
timestamp: December 23, 2019, 08:29:11 am
content: Quote from: Siwastaja on December 22, 2019, 09:31:12 pmYes, the old electromechanical buzzers which use an oscillator made from a relay with a normally closed contact in series with he coil are polarity insensitive, but the newer type which have a transistor oscillator are.Another thing to note is the electromechanical buzzers require a freewheeling diode, because they generate back-EMF when the current in the coil is interrupred whilst the transistor type do not, as they have one built-in.

author: Nikos A.
author_rank: Regular Contributor
timestamp: December 29, 2019, 02:07:15 pm
content: Quote from: Zero999 on December 23, 2019, 08:29:11 amYes, you're right, I didn't even know about the coil inside... Thanks for the recommendations guys!!
(Solved) Si4060 (or similar) question - Page 1
Forum section: electronics / projects

author: antenna
author_rank: Frequent Contributor
timestamp: December 13, 2022, 09:22:44 am
content: Where can I find more information on setting up those little key fob RF transmitter chips like the Si4063? I just want to stick it on a board, tell it what frequency I want, then have it output a specific string of bits as OOK based on what GPIO pin I trigger. The datasheet didn't make the procedure for setting it up very clear (at least not to me). I have a good VNA and I think I can handle the filter part when i get to making the board, but I am confused on how to talk to the chip and I'd like to understand that before buying something like this.examplehttps://www.mouser.com/datasheet/2/368/Si4063_60-1397990.pdfThanks!Edit: I found a couple arduino solutions for this, going to give it a try.

author: antenna
author_rank: Frequent Contributor
timestamp: December 13, 2022, 09:48:03 am
content: I may have answered my own question finding the EZRadioPro development kit...Is there a chip out there that does the same thing that can be programmed by manually clocking in some data? I would like to be able to change the parameters of the chip without connecting it to a $300 computer.
SI4732 vcc cap value - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: February 04, 2022, 01:54:33 pm
content: hi all,i was desoldering the main on off switch on my SI4732 based receiver,i was using a hot air station to remove it,problem was it has 2x chip capacitors between the battery main + and ground,they are too small for me to solder back on the board,am i right in thinking its just a bypass cap for the ldo? so say a 330nf should do the trick ?,tia.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 04, 2022, 02:45:39 pm
content: A cap from supply to ground should be a decoupling cap and not sensitive to the exact value. So one may not see much difference between some 10 nF and 10 µF. If too small to solder, I would expect them to more like the smaller capacitance ones, like 100 nF or maybe less.

author: m3vuv
author_rank: Super Contributor
timestamp: February 10, 2022, 11:50:15 pm
content: Well i upgraded the firmware on this from ver 1.1.5 (original fw) to ver 3.7.xx,i found the encoder missed lots of steps,so thinking it was faulty took it apart to clean and check it,it looked totaly faultless !,im thinking of having a rotary switch and a center off toggle non latching switch,idea beeing rotate the rotary switch to select the function to change then once selected push the toggle switch one way for up and one way for down,has anyone had fw issues after upgrading ?.
Si5351A and external clock reference - Page 1
Forum section: electronics / projects

author: franco84
author_rank: Newbie
timestamp: March 24, 2025, 05:53:40 pm
content: Is it possible to insert an external reference clock instead of quartz at the SI5351A?

author: fourfathom
author_rank: Super Contributor
timestamp: March 24, 2025, 07:02:02 pm
content: Yes, many designs do this. The most recent spec has some information on this (here:https://d1ehax0mqsd4rz.cloudfront.net/-/media/SkyWorks/SL/documents/public/data-sheets/Si5350A-B.pdf?rev=c3b847e478ca471190beaf99be50fb8e). See section "6.6. Applying a Reference Clock at XTAL Input".The spec says 25/27 MHz, 1Vpp for the input, but I and many others are driving it with up to 3.3V (logic-level) inputs. I typically use a 10 MHz input and others have experimented with lower frequencies as well. I've not seen any spurious response issues with the lower frequencies, but at some point the PLL loop filter response may come into play. Keep in mind that due to the feedback dividers, a 10 MHz reference clock limits the maximum PLL frequency to 900 MHz. That's the PLL max frequency spec, but we know it can go significantly faster (typically).One advantage of using the lower reference frequency is that it gives you increased frequency resolution (smaller step size) when setting the PLL frequency.Do not overdrive the XTAL in pin -- it's pretty sensitive and people have killed the chip when giving it an external clock. I sell external clock adaptors for a couple of SDR radios that use the Si5351, and I include impedance control and transient suppression which has provided good protection.
SI570 clock generator for qrp lab's receiver module - Page 1
Forum section: electronics / projects

author: ealex
author_rank: Frequent Contributor
timestamp: March 28, 2017, 11:02:19 am
content: helloi've done a quick board that will fit under the qrp lab's receiver module (http://shop.qrp-labs.com/receiver)the board fits under the mounting holes and LO and power lines align with the pins on the receiver module.it's based on the si570 + attiny85 projects, adding a local DC/DC converter that will boost the 5V_USB to floating 12V and 5V.i chose the si570 + attiny85 because there is support for it in most SDR software.there is a footprint that allows a transformer to be added at the output of the si570 clock generator.also, there are footprints that allow to connect all floating grounds to the board's main ground.a render from kicad:things that did not work as designed:- the floating power supply was a bad idea, i could see some strange high level oscillations - 100MHz, 200mV RMS or more on the power rails, this was fixed by joining the grounds ( bridge R8).- in my case using a transformer for the SI570 output was not working - i did not think about proper matching and the signal was distorted. i've ended up bypassing the transformer footprint and by bridging R13.- the filtering on the 12V rail was not sufficient (the stuff around L4): the DC/DC is very noisy and it was not enough, the noise was affecting the output signal. The receiver will work with only a 5V supply and the 7805 that provides the 5V rail is able to clean it up properly => the 12V output is no longer used.here are some simple tests with different powering options. The LO is set for 10MHz and a -100dBm signal is provided at 10.010MHz.12V and 5V ( or 12V only, 5V from a 7805 dead bugged under the board ) from a bench supply:12V and 5V from the DC/DC converter:5V only from the bench supply:5V only from the DC/DC converter:5V straight from the 5V_USB rail:the board where made at eurocircuits - they are expensive, but fast, and they have an interesting soldermask: mate dark green, not glossy.i will make some photos is anyone is interested.you can find the kicad project attached, feel free to use it.

author: bobaruni
author_rank: Regular Contributor
timestamp: March 28, 2017, 04:58:19 pm
content: Nice!
SI570 self-reset problem - Page 1
Forum section: electronics / projects

author: JuniorJack
author_rank: Contributor
timestamp: January 15, 2014, 05:44:38 pm
content: Hello,I am having specific problem with the SI570 oscillator. Have tried to search for anyone with similar problem, but sofar nothing so I was hoping if anyone can maybe help. I am trying to use the frequency range 14-112 Mhz. It seemsthere are certain frequencies that are not achievable. For example 16.100 - 16.800, 18.200 - 18.300, 20.000-20.100,etc (in Mhz). Instead the chip just defaults to its startup frequency of 56.32 (it is 570CAC000141DG).At first I thought is maybe problem with the calculation, but checking RFREQ, N1 and HSDIV - they all seems to bevalid. Very detailed debugging of the problem shows that actually the contents of the regs 7-13 after write andunfreeze(DCO bit or M bit) is not what has been written, but instead i got the startup values.I have also checked many software implementations available on the net for si570 drivers, non of them is reading back the registers 7-13 after write for verification, so i assume this happens only to me. The other confusing thing is that i haven't seen any mention in the pdf of reset to default if illegal register values are present, error on the I2C bus, etc.Right now i belive this is I2C bus related problem, as the behavior changes a bit with varying the speed on the bus.But still is working fine for most of the frequencies in the range, only small sets can not be generated.Any suggestions are welcome, thank you.BR

author: JuniorJack
author_rank: Contributor
timestamp: March 05, 2014, 09:50:40 am
content: Just for the sake of future Google search results. I have found the problem, it was simple typo on large frequency change, i was setting the NewGreq bit to register 137, instead of 135.So there is undocumented feature(bug) that resets the SI570 to default frequency on such error condition. So it seems verifying the frequency after every small or large change is absolutely needed, specially for critical implementations like mine(ham transceiver).

author: joedarock
author_rank: Contributor
timestamp: April 03, 2014, 07:28:32 pm
content: JuniorJackI'm having a similar problem. I'm using a PIC877A's internal MSSP module in I2C mpde, running at 100 khz to communicate with the SI570. I can write to and read back all registers from 9 to 12 with any value, no problem. However, registers 7 & 8 will only accept numbers up to a certain value and anything over that resets the part to the defaults. Going through the 'freeze', 'set frequency', 'unfreeze', 'NewFreq' process doesn't seem to help. Also, when I read register 137, I get decimal 8 instead of the expected decimal 16. It seems to get worse when I call the write function repeatedly, so it seems like it could be an I2C problem or a combination of 2 problems.If you have any more insight from your work, I'd like to hear it.Joe
Si8652 Supply pins getting shorted in field use - Page 1
Forum section: electronics / projects

author: enggmayank
author_rank: Newbie
timestamp: August 01, 2016, 05:44:24 pm
content: Hi Guys,I am using Si8652/Si8452 digital signal isolaters for isolating RS485 communication pins from MCU. MCU is driven by 3.3V logic whereas MAX485 is driven by 5V. Si8652/Si8452 is supplied respective power supplies for each side.The device acts as a MODBUS Master, so I have provided fail safe biasing (560E - 120E - 560E).In field use I have observed that Isolation side Supply and Ground pins on Si8652/Si8452 get damaged (low resistance or short), causing the communication to fail.- The RS485 side of circuit is protected against transients using 2 x Littlefuse SMAJ12CA on A and B lines.- Si8652 is powered via a regulated 5V source (LM7805) isolated via MORNSUN B0512S Isolated DC/DC converter.I are trying to replicate the scenarios:1. DC Test: Directly connected 24VDC to RS485 inputs.Result: TVS, PPTC protection kicks in and no damage is done to components.2. ESD/EFT/Surge test: To be conducted at a test lab as i don't have required test equipment.Appreciate if you can share your advice/knowledge on the same.Regards
Side panel buttons on small enclosure -- How do phones make them so sleek? - Page 1
Forum section: electronics / projects

author: TheGreatNed
author_rank: Contributor
timestamp: October 26, 2016, 01:43:15 am
content: Hello EEVBlog members,I'm doing an RF project that involves a 3x2 inch enclosed PCB with a battery inside.My mechanical guy made the enclosure reallllllllllly sleek. But we have this ugly pair of PCB mounted tactile buttons poking out the side.Can anyone help me achieve the sleek tactile buttons that seem molded into the case of every phone out there? Those thin ones on the side that just blend with the enclosure? I know I can't get it perfect, but I can pend some money on this. Different approaches for sleek buttons are also welcome.Thanks... any help is greatly appreciated!!

author: helius
author_rank: Super Contributor
timestamp: October 26, 2016, 02:05:45 am
content: If you take a phone apart you will see that the buttons are molded into the case, and most of their tactility comes from that. They "blend in" because they are designed with the case as one unit. The PCB switches inside are about 1.5 mm. See Panasonic EVP-AV as an example.

author: Someone
author_rank: Super Contributor
timestamp: October 26, 2016, 02:34:40 am
content: Many of those perfectly aligned switches you see on small devices are made with living hinges in injection moulded plastic, either as part of the case or as a separate insert. Cheaper products use captive switch caps that are held in place against the enclosure by the force of the switch.http://au.rs-online.com/web/p/push-button-caps/4952517/The shoulders on those caps prevent them coming through the panel work, and you can manufacture/machine your own that sit flush with the case.
Suggestion for Side view dual phototransistor part number for low cost encoder - Page 1
Forum section: electronics / projects

author: rvalente
author_rank: Frequent Contributor
timestamp: December 27, 2016, 06:28:22 pm
content: Hello mates,I'm looking for a alternative to everlight PT2559 or PT5529, which are side view dual phototransistor in a horizontal assembly.This will be used in a low cost 4° resolution optical encoder, suggestions?http://www.everlight.com/file/ProductFile/PT5529B-L2-H2-F.pdfhttp://www.everlight.com/file/ProductFile/PT2559B-L2-F.pdf

author: rvalente
author_rank: Frequent Contributor
timestamp: January 02, 2017, 05:32:57 pm
content: C'mon guys, any help?

author: Benta
author_rank: Super Contributor
timestamp: January 02, 2017, 11:10:02 pm
content: Sharp, Toshiba and Vishay come to mind. You'll have to the digging yourself.

author: kiran_shrestha
author_rank: Regular Contributor
timestamp: January 03, 2017, 01:22:11 am
content: Spent my time...... for no result.

author: richardlawson1489
author_rank: Regular Contributor
timestamp: January 03, 2017, 02:44:50 pm
content: What about digikey?
Siemens LL Cap Datasheet - Page 1
Forum section: electronics / projects

author: asp
author_rank: Regular Contributor
timestamp: February 10, 2015, 10:52:00 am
content: Hi guysCan you please tell me if this is a AC or DC cap? I can't find the datasheet for it anywhere. I would want to use it across 230V mains ( I know it's REALLY close to the limit as it's 230 * sqrt( 2 ) ). Also if anyone knows if this is a X rated cap would be awesomeThanksEdit: Seems that it may be a EPCOS cap (or at lease they have some datasheet on a cap that's really similar)Edit2: It's a DC cap in the end. + on the left hand side of the image.

author: bktemp
author_rank: Super Contributor
timestamp: February 10, 2015, 11:55:09 am
content: It is an electrolytic cap, therefore only DC.B43566 is the partnumber.
Siemens PLC programming - Page 1
Forum section: electronics / projects

author: VoidsWarranties
author_rank: Contributor
timestamp: March 08, 2018, 10:37:14 pm
content: So I bought an old industrial control cabinet and it had a PLC inside of it that I would like to use. It’s a s7-200and it had a scale and touch screen attached to it though the 2 serial ports. Does anyone know where to get cheap or free lite version of the software for it? Could it be programmed with some other type of software such as arduino with an additional library and such? I believe it uses s7 Microwin. Any help would be greatly appreciated.Sent from my iPhone using Tapatalk

author: ahbushnell
author_rank: Frequent Contributor
timestamp: March 08, 2018, 11:56:05 pm
content: Did you go to the Siemens PLC web site. I know ABB has free software for there PLC's.Good luck.

author: abraxa
author_rank: Frequent Contributor
timestamp: March 09, 2018, 12:35:58 am
content: Fromhttp://w3.siemens.com/mcms/simatic-controller-software/en/step7/step7-micro-win/Pages/Default.aspx:QuoteI assume current versions of Step7 don't support the S7-200 anymore but you can download a trial version fromhttps://support.industry.siemens.com/cs/products?search=trial&dtp=Download&mfn=ps&o=DefaultRankingDesc&pnid=14674&lc=en-WWand try.As for free or cheap, or Arduino... you never worked with PLCs before, I assume. They're cash cows for a reason

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: March 09, 2018, 08:59:41 pm
content: Quote from: abraxa on March 09, 2018, 12:35:58 am'Free' or 'cheap' are only allowed in clearly defined situations within the veritable House of Siemens.Such as:'It is surelycheapof this customer to compare our prices with ABB'or'Our PLCs arefreeof the deficiencies which are characteristic of the other manufacturers'Just to be on the safe side, we renamed FELs as 'Less confined electronj laser'.

author: userrr
author_rank: Newbie
timestamp: April 01, 2018, 01:07:04 pm
content: Hello,my first post in the eevblog forum...happy to be here :-)to the topic:Welcome to the Siemens Automation universe ;-)I worked with Siemens stuff in the last years as a "Mechatroniker" (german apprenticeship). So I haven't worked constantly on PLCs but I build about 20 control cabinets with S7-300, S7-1200, LOGO, VIPA SLIOHave you looked into snap7?http://snap7.sourceforge.net/I never tried it but maybe they support the 200.VIPAhttp://www.vipa.com/home/is a interesting company from a Siemens guy perspective...
Siemens Shortwave Receiver rel 445 E311 d2 Special Component, what ? - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 12, 2022, 08:37:21 am
content: in my latest video release i found a "new" componentI have not seen before, it is shown at 27 minsSiemens Blue "ic" with 5 pinsbut the same part is also used many other places, with some pins cut awaycould it be a micro made selenium rectifier bridge ?the 4 diodes often have 5 connections to them.anyone with a datasheet ?the video is herehttps://youtu.be/XD4yW-Gs1DA

author: Gianni
author_rank: Contributor
timestamp: August 08, 2022, 08:09:52 am
content: Hi! Very happy to find another enthusiast for this wonderful receiver!The strange 5 pin components are normal diodes, in parallel with the relay-coils.Very nice your video! From my side, I prepared a small technical note on the e311, with some translations from the original manuals.You can download it from here:http://www.k100.biz/parade.htmYou can find there also my photo-booklet where also the e311 is included.
Siemens Sinamics V20 Inverter Connection macro Cn007 in NPN mode? - Page 1
Forum section: electronics / projects

author: beduino
author_rank: Regular Contributor
timestamp: March 07, 2019, 10:11:33 pm
content: Hello,I've brand new Siemens Sinamics V20 Inverter:https://www.automatyka.siemens.pl/docs/docs_ia/V20_ENG_2016.pdfTrying to figure out if is it possible use connection macro Cn007 in NPN mode similar to Cn002 by connecting DIC to 24V similar to product manual connection macro "Cn002 - Control from terminals PNP/NPN" ?Unfortunatelly, connection macro "Cn007 - External push buttons with analog control" in product manual is shown in PNP mode where DIC wired to 0V, so while I'm designing optocoupled microcontroler based PCB with digital potentiometer and I'd like to controll 3phase 0.5kW inductor motor using this macro Cn007, NPN configuration shown in Cn002 macro could allow simply connect DI1,DI2,DI3,DI4 to 0V when needed.Maybe someone had experience with this inverter and used Cn007 macro in NPN mode?I'm confused, since in Cn002 macro thet implicit show PNP/NPN possible configurations, while in Cn007 macro only PNP is shownRegards.

author: beduino
author_rank: Regular Contributor
timestamp: March 07, 2019, 10:59:07 pm
content: Looks like macro Cn002 should be fine in my application, since I've already found that potentiometer AI1 determines speed in this mode, DI1 can be used for ON/OFF1I do not need reverse motor spining direction, so Cn002 should be fine in NPN mode.I've seen on YT examples with Cn007 macro used for something similar, so I thought to use Cn007, but probably Cn002 should be fine.What do you think?

author: Kalin
author_rank: Regular Contributor
timestamp: March 08, 2019, 12:38:55 am
content: Changing the jumper DIC will change what voltage is sitting on the input terminals when they are open. If it is jumpered to 24V the terminals will have 24V on them and to change their state you would connect them to 0V. This is what you are referring to as non and you can connect them in that configuration for 007Sent from my SM-G965W using Tapatalk

author: beduino
author_rank: Regular Contributor
timestamp: March 08, 2019, 09:33:32 pm
content: Quote from: Kalin on March 08, 2019, 12:38:55 amYep, it makes sense.Anyway I've found on YT desent example of using macro Cn002 with potentiometer and switch and this is exactly what I need.PCB with low power 8bit 8pin MCU will be powered from 0V-10V potentiometer terminals since they provide a few mA of current and optocouplers used in NPN configuration to turn motor ON/OFF
Siglent 1104x Scope - Automatic measurement of Peak to Peak from two channels? - Page 1
Forum section: electronics / projects

author: larrybud
author_rank: Contributor
timestamp: December 16, 2024, 02:07:43 pm
content: I have two signals (sine waves) of different frequency going into my scope. Is there a way to automatically measure the difference in the two peaks, or do I simply use cursors for that function?Just for clarification, I want to measure Channel 1 Peak - Channel 2 Peak.If this scope can't do it, do other scopes have this capability, and if so, what is the function called?

author: themadhippy
author_rank: Super Contributor
timestamp: December 16, 2024, 04:02:40 pm
content: Take a look at the math button

author: larrybud
author_rank: Contributor
timestamp: December 17, 2024, 12:30:28 pm
content: I did. What can you specifically point me to in the math function which will operate with the peak-peak difference when the two signals are of different frequencies?

author: themadhippy
author_rank: Super Contributor
timestamp: December 17, 2024, 02:35:16 pm
content: set each channel to show the peak value in the measure page, in the math page set what type of maths you want to carry out,then back in the measure page set the maths channel to display the whatever information you want to see.

author: larrybud
author_rank: Contributor
timestamp: December 17, 2024, 09:16:49 pm
content: Is this a general process or one specific to the 1104x? I don't see a math function which can measure the voltage difference between the peak of two different channels. Maybe I don't know what to look for.

author: themadhippy
author_rank: Super Contributor
timestamp: December 17, 2024, 10:31:56 pm
content: QuoteThe maths function isn't measuring the voltage. You set up what you want measuring (page 131 in the manual)then use the math function to carry out the math operation on the selected channels(page 116 in the manual) if you want the result displayed as a value as well as its trace you do that back in in the measure page

author: larrybud
author_rank: Contributor
timestamp: December 18, 2024, 02:45:09 pm
content: Maybe I'm blind as far as the options, but I don't see any way to set it up to measure the difference of the peak between two different channels, which is what my goal is.Just a note, I think there's a couple versions of manuals out there for this scope, as page numbers don't match up (e.g. my page 131 as for FFT markers).

author: themadhippy
author_rank: Super Contributor
timestamp: December 18, 2024, 03:50:15 pm
content: ok lets take it one step at a time,have you got the scope to show the peak voltage of both traces at the bottom of the screen?

author: larrybud
author_rank: Contributor
timestamp: March 02, 2025, 05:40:13 pm
content: Yes,See an attachment for example.

author: 2N3055
author_rank: Super Contributor
timestamp: March 02, 2025, 08:04:46 pm
content: No, you cannot perform math between two measurement results.
Siglent / Agilent Case Design look alike for own projects, exist ? - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: September 02, 2022, 10:26:22 pm
content: did anyone find a ready made casethat looks a little bit like Siglent or Agilent22 cm width 10 cm height product line ?this way own DIY units will fit on top , and look just as nice ?any ideas ?

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 03, 2022, 09:22:32 pm
content: A quick search for Alibaba tabletop enclosure returned good results:https://m.alibaba.com/product/60775679078/CHANGHE-aluminum-desktop-enclosure-console-enclosure.html
Siglent sds1104x-e bode plots - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: January 11, 2022, 08:32:13 am
content: How does the signal generator option connect to the sds1104x-e? Is that a usb connector on the front of the scope? Mine isnt here yet. If so, is the protocol documented? I assume the scope is driving the generator when it sweeps for a bode plot, no?I have a lot of experience coding usb drivers and applications. I coded my own usb rotary encoder for my icom radio a while back, it also works on their remote control software., for instance. I was thinking, I could take an stm32f7 board of some type and interpose that between the scope and HP function generators I have and then translate the scope output from usb to gpib, or just send the commands to a pc application that then talks to the gpib. I can trace the usb commands using wireshark or one of the other tools I have so it should be pretty ease. Having a little box like that would enable us to connect one of many generators to the scope, maybe make it command table driven so the box just translates the usb commands to the selected gpib or SCPI commands. I know there is an arduino gpib toolkit, maybe we could use that?Thoughts? The little arb generator for the scope isnt that much money, that's not the point as much as the fact that i have some very good signal generators including dds type that could easily be attached if we know the protocol. Can you control that arb box from a pc directly?ThanksJerry

author: RichardM
author_rank: Frequent Contributor
timestamp: January 11, 2022, 12:39:46 pm
content: I have the same scope and have avoided buying another signal generator as I also have a nice HP oscillator. I may just bite the bullet and get the Siglent USB gnenerator but watch for any progress on this topic with interest.RegardsRichard

author: YurkshireLad
author_rank: Frequent Contributor
timestamp: January 11, 2022, 02:24:41 pm
content: Do you need the Siglent generator to get Bode plots on this scope? Nothing else will work?

author: JohanH
author_rank: Frequent Contributor
timestamp: January 11, 2022, 02:43:31 pm
content: It works with any Siglent signal generator that has USB connector and is able to communicate with the oscilloscope.If you want to use a non-Siglent signal generator, it might be possible but not straightforward, see here:https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-and-sds1204x-e-bode-plot-with-non-siglent-awg/

author: cncjerry
author_rank: Unknown
timestamp: January 12, 2022, 01:58:25 am
content: Quote from: jukk on January 11, 2022, 02:43:31 pmso that saves all my efforts. I was planning pretty much the same as an alternative, either intercept from the scope and send to the PC or, as the author mentions, just intercept them on the PC and write gpib commands from Visual Studio.
Siglent SDS2104X+ hard shell carry case HC-1 - Page 1
Forum section: electronics / projects

author: Debugging
author_rank: Contributor
timestamp: February 05, 2023, 02:44:34 pm
content: Living in Asia, was told by the local Siglent agent that the hard-case is only available in the USA market and they won't sell it.They will only help to sell it if there are more customer to fulfill an MOQ demand.It seems Siglentna.com website does not offer shipment to Asian destinations either. (not even to China)Before making more attempts finding ways to get one from Siglent US by myself, does anyone use the hard case with the size of the SDS2X0X+ products ? Pro's and Con's ?https://siglentna.com/product/hard-shell-carry-case/
Siglent SDS2104X Plus - Scope-internal frequency visible in FFT? - Page 1
Forum section: electronics / projects

author: RandomUser
author_rank: Contributor
timestamp: December 20, 2023, 03:35:46 pm
content: Hello,I want to do some pre-compliance EMC measurements with my SDS2104X Plus. Unfortunately, it shows 2 peaks when directly terminated into a RF-50R SMA.I'm using channel 3 as input for the FFT.Is this my scope?Does anyone else has such a problem with his siglent?Do I see an internal SMPS regulator showing in my spectrum?See attached picture.Any feedback is appreciated.Thanks!

author: RandomUser
author_rank: Contributor
timestamp: December 20, 2023, 08:34:44 pm
content: Okay, did some research...A big thanks to Dave for the HiRes photos.I post a snippet of that below.The power supply IC is a TI TPS65400 4ch buck.The datasheet specifies a minimum SW-Freq. of 275kHz set by an external resistor.When doing the FFT on ch. 1-4 I get to see 281kHz with RBW~1kHz. So basically min. frequency. Might be slightly off e.g. due to resistor tolerances.Due to the distance of the supply to the analog input / ADC circuitry I suspect the ripple on the supply voltage to be the verdict of my FFT result.On the other hand I get the best result on Ch3 which has the same supply as Ch4, I guess? Therefore, I would expect to see same results on those channels but when doing the same settings, this is what I get.Any ideas?

author: temperance
author_rank: Super Contributor
timestamp: December 20, 2023, 08:45:45 pm
content: Volts = 10(dBV/20-110 dBV= 3.16 µVGood luck.

author: 2N3055
author_rank: Super Contributor
timestamp: December 20, 2023, 09:36:29 pm
content: That noise floor is actually crazy good....

author: lucy.sierra
author_rank: Newbie
timestamp: January 05, 2024, 05:11:08 pm
content: Ken Wyattcould help you out.
[SOLVED]Signal conditioning temp sensor output with high & low clamp - Page 1
Forum section: electronics / projects

author: smoothVTer
author_rank: Regular Contributor
timestamp: November 09, 2022, 09:25:16 pm
content: I need to interface the LMT86 temperature sensor with a LTC6992-1 voltage-to-pwm converter for an application which will not be using any embedded processor. Everything is on a 3.3V single-supply. I can use op amps, references and comparators to achieve the final solution. Bandwidth is not an issue for this purpose.The LMT86 outputs 2.6V @ -50C and 0.4V @ 150C, so it has a negative tempco. The LTC6992-1 takes 0V-1V on its MOD pin to control duty cycle proportionally. I am aware that voltage on MOD can go as high as the supply - 0.3V, while the duty cycle is maxed at 100%, but for the sake of self edification I want to clamp it to 1V. As for the PWM signal itself, I need at minimum 30% duty cycle and at maximum 100% duty cycle. So, anywhere from 300mV to 1V input to the LTC6992-1. Thus the output from any signal conditioning circuitry needs to clamp to 300mV at the low end and to 1.0V at the high end. Stated another way: if the temperature >= 75C (LMT86 outputs 1.25V), I want the duty cycle to top out to 100% If the temperature is <= 25C ( LMT86 outputs 1.75V ), I want the duty cycle to bottom out to 30%. In between 25C - 75C, I want the duty cycle to scale proportionally.Thus, transfer characteristic I am trying to get is:The sloped portion of the line has the equation of y = -1.4x + 2.75, so I gather than the op amp needs an Av = 1.4 with an offset of 2.75V. I know I probably need to use an op amp configured as a summing amplifier, with some circuitry sprinkled in to sense and apply the clamps. However, there are some considerations I cannot figure out. Namely,-- Since this slope is negative, I don't know how to 'subtract from' using an op amp with this particular signal. If all I needed was a gain of 1.4 and an offset of 2.75, I think I could do this part of the design, but I don't understand how the negative way would be designed.-- How do I achieve the clamps at 300mV and 1V? There will be a fairly tight LDO used, so I can derive 300mV and 1V reference levels, buffer them, and use them ... but how would I clamp at the low and high ends?

author: smoothVTer
author_rank: Regular Contributor
timestamp: November 10, 2022, 04:32:02 pm
content: So, I actually figured this problem out and I am posting the solution here for posterity. Funny how, once you ask the question out loud, the answers sort of come to youOverall here is the circuit solution and sim results, at least for DC/low freq purposes:
Signal controlled valve switching circuit - Page 1
Forum section: electronics / projects

author: jbrookley
author_rank: Newbie
timestamp: March 25, 2018, 04:24:31 am
content: Hello everyone!I'm currently trying to toggle a valve on and off, have a preliminary circuit but thought I'd bounce it off of you guys and see if you have a better approach.I have a 6.5W valve that operates at 24VDC (+/- 10%), so I'm expecting it to pull about 270 mA of current.I basically have a circuit that is controlled by a 5V microcontroller signal that I'm switching on and off using a transistor as a switch and a BUF634U (which is rated at 250 mA of current) to generate the necessary current. I'm attaching the circuit I have.I have a few concerns:1) THe BUF634U is rated at 250 mA of current. If my calculations are correct, I'll likely need about 270 mA of current. I'm guessing I probably need to switch over to an OPA547, right?2) I'm using a BJT to be used as a switch. Should I consider using a FET instead? What are the advantages/disadvantages of each? Is one more preferable if I'm looking to switch these on and off quickly?3) Do I need/should I have a flyback diode on the resistor?Let me know if anyone has a better approach to doing this or has any suggestions. In my head, this is the way to go but I'm nowhere near as experienced as I'd like to be and I figure there are lots of more experienced EE's in here. Thanks for your time!

author: jbrookley
author_rank: Newbie
timestamp: March 25, 2018, 04:40:49 am
content: Quote from: blueskull on March 25, 2018, 04:28:56 amI knew I was way overthinking it . . . I thought I needed that resistor on the transistor to protect the BJT, which had me thinking about the voltage drop at higher currents, etc. If that's not the case though, this way looks much, much simpler. Thanks a lot!
Signal generator clock instead of crystal on MCU - settings? - Page 1
Forum section: electronics / projects

author: okw
author_rank: Frequent Contributor
timestamp: November 10, 2024, 06:10:27 pm
content: I have trouble with a crystal and ESP32-C3 (chip, not module), so I'll inject the clock with a signal generator (UTG962E, I also have a R&S SME03 if the Uni-T performs poor). ESP runs at 3.3V.Crystal requirements are 40MHz ±10 ppm and recommended that the amplitude of the crystal is greater than 500 mV.I guess it shouldn't swing around 0V. What's the rule of thumb here? If the MCU runs at 3.3V should it swing around half of this (1.65V) with amplitude that won't exceed 3.3V (or goes below 0V)?And when the hardware guide says 500mV. Is that Vrms or Vpp?Would I inject the clock in XTAL_P (pin 30) or XTAL_N (pin 31)?https://docs.espressif.com/projects/esp-hardware-design-guidelines/en/latest/esp32c3/esp-hardware-design-guidelines-en-master-esp32c3.pdf

author: PCB.Wiz
author_rank: Super Contributor
timestamp: November 10, 2024, 06:35:11 pm
content: If the MCU already supports a crystal, the simplest is to select crystal mode and AC couple (100pF~1nF) the generator into the XTALIN pin.That lets the xtal amplifier bias to its natural point.

author: okw
author_rank: Frequent Contributor
timestamp: November 10, 2024, 06:42:45 pm
content: You mean remove R1, then put a capacitor in series with pin 30 and then feed the clock into the cap?Which voltage and offset should I set my generator to?

author: Someone
author_rank: Super Contributor
timestamp: November 10, 2024, 10:07:23 pm
content: Quote from: okw on November 10, 2024, 06:42:45 pmIs that in input pin of the crystal oscillator circuitry ?

author: okw
author_rank: Frequent Contributor
timestamp: November 10, 2024, 10:42:46 pm
content: Quote from: Someone on November 10, 2024, 10:07:23 pmActually, I think it is the crystal power? I just hoped it wasn't. Cause then I need to desolder the 2x1.6mm crystal which is located super close to the ESP32.

author: RFDx
author_rank: Regular Contributor
timestamp: November 12, 2024, 03:32:01 am
content: Quote from: okw on November 10, 2024, 06:10:27 pmA crystal has no "amplitude". If you want to use an external clock source the required (sine wave) amplitude is min. 500 mVp (= 1Vpp).QuoteXTAL_N (pin 29) would be the input. Put 1nF in series with pin 29 and a 51 Ohm shunt resistor in front of it to match the impedance of the generator.
signal ground wire isolation from main power ground - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: February 22, 2014, 02:03:22 pm
content: I'm doing a small power supply circuit to power a sensor converting 28V down to 8V. Now this sensor and the power circuit that will go on the back of the sensor are in a box that also has a 3A brushless motor driver in it. So there will be potentially a noisy ground wire coming in so I'm using separate ground return wire but of course it's still ground so could have power coming down it. How can I try and isolate it so that the power will prefer the power wire and not my signal return wire ?Will putting a resistor or inductor from the sensor ground to the power ground and then taking my signal from the sensor ground pin help ?ultimately the signal ground goes back to the control box where as the power will come from the vehicle power so there is some separation.

author: Prime73
author_rank: Regular Contributor
timestamp: February 22, 2014, 02:43:10 pm
content: maybe this document will give you some ideas:http://www.ni.com/white-paper/3344/en/I'm interested in the same subject basically. I've finished a diy power amplifier and I have a slight noise ( i can barely hear is if I put my ear right against a tweeter in my speakers) which I believe is a noisy ground. However I think it could be fixed. I've reduced all the power wiring to a minimum length which helped a lot, however still not quite happy with the result.

author: SeanB
author_rank: Super Contributor
timestamp: February 22, 2014, 04:31:50 pm
content: Separate the ground wires for each circuit, and have a common mode choke on the sensor wiring so it can float noise wise. Add the same in the motor wiring but rated for the motor current, and use some ceramic capacitors across the power rails. Basically power each separately, and hopefully they do not need to talk to each other, if so then use either an optoisolator or a signal transformer to provide isolation.

author: Simon
author_rank: Unknown
timestamp: February 22, 2014, 05:45:50 pm
content: Well I have no control over the vehicle harnessing, they will be separate but of course they are both the same connection so I want to find a way of "convincing" the higher current supply to not take the route down my signal ground, it will be longer and possibly thinner in some places so I'm hoping a choke will make the fast varying power take the easier route which will not be down my wire.
Signal Integrity Boad - Page 1
Forum section: electronics / projects

author: noname4me
author_rank: Regular Contributor
timestamp: July 12, 2019, 02:24:46 am
content: Hi,I was looking into a design which has crosstalk issues and this got me thinking that I would love to be able to have a PCB designed by someone that really understood this concept as a "teach yourself" type project.I'm thinking of something along the lines of "here is a board that has issues - try and fix it" with large areas around that allows you to try different fixes and evaluate the benefits or otherwise of each "fix".Is there anything that exists like this?(Looking for something other than a simulation route)ThanksSent from my SM-N960F using Tapatalk

author: Rerouter
author_rank: Super Contributor
timestamp: July 12, 2019, 03:03:51 am
content: I would call that buying a moderatly complex kit from jaycar or similar. Handing it to a beginner to assemble with minimal guidance. And bam troubleshooting project.

author: Ice-Tea
author_rank: Super Contributor
timestamp: July 12, 2019, 06:57:47 am
content: Quote from: noname4me on July 12, 2019, 02:24:46 amThe problem is probably that a lot of good fixed would be in the layout. So that would be difficult..

author: noname4me
author_rank: Regular Contributor
timestamp: July 12, 2019, 06:41:20 pm
content: So, I get what you're saying, and it is correct, no doubt.I was thinking of something more line what you get to see at EMC, and the fixes that are applied to at least test the principle of the fix... that does not need a board respond, but it does give you a good feel for the topicI have a PWM signal superimposed on to an analog sensor output, the cause of which I think is that the ground is shared between the two and it goes to another board via a ribbon cable.If I wanted to test fixes I would love to have a set of tricks that I know will work in that scenario having played on a board with a similar problem before.That's the sort of thing I'm driving at...I don't think there is anything like that available but perhaps it might be something someone has come across before...Sent from my SM-N960F using Tapatalk
Signal Integrity - DDR Routing over ground stitching vias - Page 1
Forum section: electronics / projects

author: LoveOatmeal
author_rank: Newbie
timestamp: October 05, 2021, 02:55:15 am
content: Hi All,I'm doing some DDR4 routing on a multi-layer board, and the reference plane I am using has buried ground stitching vias all over the plane.Would these buried ground stitching vias cause discontinuities in the impedance routing of the DDR4 signals if I route/serpentine over them?What is the standard practice for these routing situations?Thanks!
Signal Tracer - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: January 29, 2022, 02:17:39 pm
content: I have a project which is like a poor man's Fluke 9010A trouble shooter, it sits in the CPU socket of a target, Z80, 6502 etc and allows you to exercise various functions...I would like to be able to add the function where you could probe around the target PCB and with a flying probe you could identify if you were touching a line that was driven by the tester... E.g. if you touch an address line, say A10, it would identify you were on A10.Simplistically I would send data on all the lines identifying then and decode this.. for example I could use a UART on all lines sending the "I am line Ann" and decode this at the other end. Doing so requires a UART on each line but I could possibly DMA or Software bit bang.I do not know the details, hence the question, but is there an encoding technique that would be better suited? I believe GPS satellites share channels so maybe an encoding technique along the same lines?Or maybe I am overthinking this and a PWM type signal where the duty cycle varies across each line would be enough?Any pointers to Google search terms that would help me would be appreciated.Thanks in advance
Signal tracing - two signals side by side or GND in between? - Page 1
Forum section: electronics / projects

author: eTobey
author_rank: Super Contributor
timestamp: January 02, 2024, 11:16:38 am
content: Hi all, and happy new year.I am wondering, about how to trace two signals of two current sensors in a BLDC controller.When i trace them together, there would be some crosstalk, so i think i put a GND in between. But could this create some capacitance that would be bad? I guess this capacitance would be negliable?The traces would be 160mm long 0,25mm wide and 0,25mm apart.

author: moffy
author_rank: Super Contributor
timestamp: January 02, 2024, 11:33:35 am
content: If you want to reduce crosstalk put gnd between the signal traces. A technique used for ribbon cable is to make every second wire (on the cable) a gnd to reduce crosstalk.

author: wraper
author_rank: Unknown
timestamp: January 02, 2024, 11:36:38 am
content: No info about the signal and PCB (layers) whatsoever.

author: Psi
author_rank: Super Contributor
timestamp: January 02, 2024, 11:55:58 am
content: What speed is the data is running at? What's the physical layer protocol, serial uart?, manchester coded etc..

author: eTobey
author_rank: Super Contributor
timestamp: January 02, 2024, 12:28:11 pm
content: These are analog signals from a current sensor.

author: Psi
author_rank: Super Contributor
timestamp: January 02, 2024, 12:44:01 pm
content: I wouldn't worry too much about slow analog current signal traces next to other analog current signal traces (Like from HALL current sensors monitoring 50/60hz).But fast digital signals next to analog signals is something to be careful about.

author: eTobey
author_rank: Super Contributor
timestamp: January 02, 2024, 01:42:45 pm
content: I should have added, that i am using these current sensors on a BLDC controller. That will run at a few hundrets of kHz.