hybridfree/eevblog-posts huggingface dataset:
Automating remote wildlife monitoring project - Page 1
Forum section: electronics / projects

author: LukeD
author_rank: Newbie
timestamp: August 08, 2024, 09:05:40 am
content: Hi all, just wanting to share my current project. I'm using a solar powered Jetson nano computer to create a self-contained system designed to be left for long periods of time to automatically detect and log wildlife in remote locations.I'm currently in the initial stages of the project and am looking for feedback on all aspects, though mainly would appreciate ideas around the battery/ power charging/management system!My video here goes into more details!https://youtu.be/qQP7rpDzXSE

author: bookaboo
author_rank: Frequent Contributor
timestamp: August 08, 2024, 02:48:37 pm
content: Neat project, some things that may be worth considering to solve the power issue:- Use an ESP32-S3 to compare the initial still images, this could decide whether to wake the SBC for power hungry processing.- Use PIR / mmWave to detect the motion then wake the SBC from sleep (they may not have the required range though)- If not already, put everything to deep sleep when the light level is too low for good imaging.- Move to LiFePo4 Lithium batteries.

author: LukeD
author_rank: Newbie
timestamp: August 09, 2024, 01:31:11 am
content: Thanks for your recommendations! I'll have a look into it.
Automation/Signal processing project ideas - Page 1
Forum section: electronics / projects

author: Kamiomi
author_rank: Contributor
timestamp: February 23, 2016, 06:11:51 pm
content: Hola !I'm an automation student in final year, and I'm struggling to find a project. Sure, there's a plethora of project ideas in the internet, but none of them caters my whims. What I want is a project mixing the electrical and mechanical side of automation with some signal processing. Anyone got an idea ?

author: mark03
author_rank: Frequent Contributor
timestamp: February 24, 2016, 01:35:25 am
content: Electrostatic field mill. There are some good ideas in this patent:http://www.google.com/patents/US6608483but most of the people who deal with this stuff seem more comfortable with analog electronics than DSP. I think it would be a fun project to do something like this with only the bare minimum analog charge amps and then everything else in microcontroller DSP.

author: hendorog
author_rank: Super Contributor
timestamp: February 24, 2016, 02:08:44 am
content: Quote from: Kamiomi on February 23, 2016, 06:11:51 pmHow about trying to mimic human movement with a simple robot arm?Something like this:http://www.salon.com/2013/09/27/some_robots_are_starting_to_move_more_like_humans_newscred/

author: f5r5e5d
author_rank: Frequent Contributor
timestamp: February 26, 2016, 05:31:20 am
content: how about a custom robot to solve a Perplexus marble maze?no need for general purpose arms, build a actuated roller cradlequite the machine vision problem toomore practical but still a challenge would be the same for just one of the flat 2D marble mazeshttps://www.google.com/#q=marble+maze+puzzle
What automotive bulkhead connector for a harness rewire - Page 1
Forum section: electronics / projects

author: Jurkstas
author_rank: Newbie
timestamp: July 04, 2024, 06:15:22 pm
content: Hi,Has anyone here experienced rebuilding an automotive harness of an older car and adding a bulkhead connector in firewall?I have a 1991 Citroen BX that has 37 wires crossing the firewall, a mix of analog signal wires, couple Ampere wires and a few with 40-50 A. Turn signal is the highest frequency signal in this harness.I would like to make it expandable, so that I could get to the either side of the connection and replace/add/remove individual wires.I am looking at TE range of industrial/automotive connectors and they have a few, but could anyone share any practical experience?I am leaning towards HDP20 series or LEAVYSEAL. DRB looks very nice, but it seems that I would need to remove cable boot to access the jackscrew which is not something I'd like.
Automotive design rules in the USA - Page 1
Forum section: electronics / projects

author: Afrotechmods
author_rank: Unknown
timestamp: October 08, 2011, 10:41:21 pm
content: I've been asked to design an aftermarket product that would be installed in cars, buses and possibly trains. It would be used to filter power and provide power to various low powered peripherals that are not related to the automobile's normal functions. It's not going to be mounted near an engine compartment or anything harsh like that, and the client seems okay with 0-70ºC rated components seeing as everything it will be powering will be limited to that anyway.Are there specific rules, laws or testing standards that need to be followed to launch such a product in the USA? And if so, could someone point me in the right direction?Big thanks to anyone who has experience in this area!

author: IanB
author_rank: Super Contributor
timestamp: October 08, 2011, 10:44:47 pm
content: You could probably make a start with Underwriters Laboratories:http://www.ul.com/global/eng/pages/
Automotive hardening? - Page 1
Forum section: electronics / projects

author: mr_guy99493
author_rank: Newbie
timestamp: April 18, 2024, 06:04:39 am
content: Hi,I'm thinking of building a PLC-type module for automotive use.Lots of 12V IO, relay drivers, CAN bus, bluetooth.I feel like the automotive use-case may require extra hardening against various effects like noise on the bus due to injectors/sparkplugs etc -> filtering, zeners, surge arrestors?Questions:Am I right that there are special considerations required for automotive circuits?What sort of considerations?Any good references about how to adapt to those problems?Reference designs that implement them?Thanks

author: AndyC_772
author_rank: Super Contributor
timestamp: April 18, 2024, 06:18:58 am
content: Yes, you're absolutely right, the automotive environment does require protection for exactly the reasons you suggest.Here's an app note from TI that describes a number of industry standard tests that are carried out on automotive products. You may find it a useful starting point:https://www.ti.com/lit/ug/tiduc41/tiduc41.pdf

author: coromonadalix
author_rank: Super Contributor
timestamp: April 19, 2024, 10:05:08 am
content: dont forget humidity and vibrations

author: MisterHeadache
author_rank: Regular Contributor
timestamp: April 19, 2024, 03:01:54 pm
content: Most automotive OEM's write their own EMC/RFI/ESD requirements and restrict who has access to those specifications. For example, General Motors has their standard GMW3097 (general specification for electrical/electronic components and subsystems, electromagnetic compatability). It's 82 pages but also references many other ISO and other industry standards for details. Those are not free, they each must be purchased.So getting actual specs will require investment on your part. If your project is just a hobby project, then you can likely find basic enough info from the app notes like AndyC_772 mentioned.Do you need third party lab certification testing for your project? If so, then that really gets costly. A new sensor EMC plan for example typically costs betwen $30k to $100k to be performed by certified US labs, depending on the quantity of tests and parts that the OEM requires be tested.
Automotive input protection circuit redesign - Page 1
Forum section: electronics / projects

author: Hengy
author_rank: Contributor
timestamp: May 29, 2018, 02:46:39 pm
content: I am currently designing the input protection part of a 5A buck converter for use in my car. I was reasonably confident in my initial design to start the PCB prototype, but, as it quite often happens, while in the process, I got to thinking about my design. My conclusion is that it is likely to go up in smoke.My design employs a power inductor on the battery input (47uH), then two SMBJ33A TVS diodes back-to-back, a N-channel MOSFET driven by a LM9061 active rectifier/reverse polarity controller, and finally 220u+100u caps. The LM9061 takes care of reverse polarity and over-current.Upon review, I know realize that if my TVS diodes clamp at a lower voltage than any other in my car, it's likely not going to last long.Obviously, one way to fix the problem is to choose higher voltage TVS diodes - my buck converter is rated for 60V. However, the 33V TVS diode for positive transients, according to the datasheet, has a max clamp voltage of 53V (if I am understanding that correctly).Adding a series resistor would limit the current during a transient, however, at 4A continuous input current, I'm dissipating a ton of heat. At 4A, with a series 10 Ohms, I'm looking at dissipating 160W, and that would limit the power through the SMBJ33A to about 500W with a 70V transient. The SMBJ33A is rated for 600W. At 100V transient, it would see 1000W.I could also use some much larger TVS diodes, but I don't really want to have my one circuit always subjected to punishment, even if that TVS diodes can handle it. Space is a limitation, and this is going to use a 2-sided, 2oz copper, 0.8mm thick PCB from OSHPark.More info:- Buck converters are TPS54560-Q1- Car is, and will only ever be a 2007 Chevy Impala LTZ 3.6L- The only limitation really is space. This is a one-off, so no bulk pricing, but there is no cost limitation, besides the ridiculousCan anyone give me suggestions on how to implement my TVS diodes? Maybe a different order of my previously mentioned components?Thanks, Hengy

author: max_torque
author_rank: Super Contributor
timestamp: May 29, 2018, 08:16:59 pm
content: How critical is the device? If it can turn off without a safety issue, then just fit a fuse! In the case of the TVS conducting the fuse will blow. simples.(if it needs to stay running regardless, then things are more tricky........)
Automotive Logic Output Protection - Page 1
Forum section: electronics / projects

author: Rerouter
author_rank: Super Contributor
timestamp: May 29, 2016, 02:52:17 am
content: I'm in the process of making a in circuit diagnostic tool, that uses a bank of 1.8-5V logic outputs and inputs, Now the inputs i have covered pretty easy,But i'm a bit stuck on finding a magic do it all buffer that can output those logic levels, and also be protected against +-32V on all outputs (E.g. if output voltage exceeded go high impedance)Output drive specs would be 1.8-5V logic with 8-15mA sink / source.Ideally I'd like it to survive being hooked up back to front across a truck battery, (how the previous model died)

author: Rerouter
author_rank: Super Contributor
timestamp: May 29, 2016, 06:47:27 am
content: sorry but the jfet option looks to drop too much voltage to be any use here,I did start to find the keywords i was looking for, e.g.https://www.maximintegrated.com/en/products/interface/circuit-protection/MAX4505.htmlHis maximum on resistance is still a little high for my liking, but its a start in the right direction,Hmm another case of always read the datasheet carefully, minimum single supply voltage is 9V,

author: Rerouter
author_rank: Super Contributor
timestamp: May 29, 2016, 07:43:45 am
content: Ok furthur looking has found better options with analog devices, looks like the 9V minimum is pretty fixed, (and there is a quirk where the positive trigger has to be between VCC and VCC-4.5V, Which means a charge pump splitting 5V to +-5V makes an ideal solution, low RSon, and a wide protection range,I'll leave this up for any who come later,
Automotive / Marine Digital Switching - Page 1
Forum section: electronics / projects

author: batteksystem
author_rank: Regular Contributor
timestamp: February 26, 2016, 01:42:18 pm
content: Greeting,Any guys from the Automotive / Marine Digital Switching here? I was working with Truck Electrical and in the past deal with heavily customized trucks. Would like to get connect with guys who had experience working on J1939 / NMEA2000, and generally automotive guys. Thanks.
Automotive style socketed relays with 5Vdc coils??.......  - Page 1
Forum section: electronics / projects

author: Smokey
author_rank: Super Contributor
timestamp: July 11, 2024, 11:14:49 pm
content: Anyone know a reliable source for automotive style relays with 5V coils?This general style (but not necessarily exactly this one):Something in the 10-20A range would be fine.Needs to socket into a fuse box type thing. Like this:Lots of 12V and 24V. But I can't find any 5V coils.Note:Yes I know there are a ton of PCB mount relays with 5V coils, and I could make the whole thing custom or play some games with switching the 12V automotive relays with one of those, but I'm seriously tired of having to custom make trivial stuff for the project and I just want to buy something off the shelf if it exists. Plus I potentially needs hundreds of them.So who wants to be my personal hero of the day with some 5Vdc coil socketed automotive relays?

author: PCB.Wiz
author_rank: Super Contributor
timestamp: July 11, 2024, 11:54:43 pm
content: 99.9% of customers will have 12V available, why would suppliers bother to make 5V coil models ?Do younothave 12V available ?

author: Kim Christensen
author_rank: Super Contributor
timestamp: July 12, 2024, 12:07:09 am
content: You could possibly use a 6V relay which is spec'd to pull in at a lower voltage than 6V:

author: langwadt
author_rank: Super Contributor
timestamp: July 12, 2024, 12:10:44 am
content: Quote from: Kim Christensen on July 12, 2024, 12:07:09 amorhttps://temcoindustrial.com/6v-30-40-amp-bosch-style-s-relay-spdt-automotive/pull-in 70% of 6V

author: Smokey
author_rank: Super Contributor
timestamp: July 12, 2024, 05:03:37 am
content: I only have control of a 5V rail that can push any appreciable power.The 6V coil relay is probably the ticket. That should work fine. Good idea.

author: PCB.Wiz
author_rank: Super Contributor
timestamp: July 12, 2024, 05:44:32 am
content: Quote from: Smokey on July 12, 2024, 05:03:37 amYou may be able to do a simple capacitive booster, to give the relays an extra kick on closure ?lcsc have a small few QC spade relays, in 5V, but only the contacts have QC in 5V models, the coils are PCB pins.
Automotive USB charging module connections - Page 1
Forum section: electronics / projects

author: aiq25
author_rank: Regular Contributor
timestamp: July 08, 2017, 06:48:52 pm
content: Hello.I got some of these automotive USB charging modules recently to use with my car (pictures are attached). My car has no USB ports but I'm planning on 3D printing a part and possibly mounting it in my dash somewhere. I was wondering if anyone knew the pinout of the connector. I was able to figure out the last pin (on the right) is the 12V input and the 3rd pin from the last is GND. I tested this and was able to charge a iPhone, Android and USB power bank. I'm just wondering what the other 4 pins are for.Instead of buying a Chinese converter which would be easier to figure out and connect, I thought these might be better in terms of quality and design, since they are supposed to be replacement parts.Thanks!

author: DBecker
author_rank: Frequent Contributor
timestamp: July 08, 2017, 08:12:59 pm
content: Do the other four pins lead to the data pins of the USB connectors?If not, they may control power enable or an enable threshold so that the converter isn't turned on below a certain voltage.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 08, 2017, 09:09:36 pm
content: Pretty ironic how you said you don't want something from China yet what you got clearly says it's from China!It looks trivial to tear down. Just undo the tabs and it looks like it will just come apart.

author: aiq25
author_rank: Regular Contributor
timestamp: July 08, 2017, 10:47:26 pm
content: Quote from: NiHaoMike on July 08, 2017, 09:09:36 pmWhat I meant by China was using the aftermarket cheap modules. Like I said this one is a OEM replacement part, so it should be better quality.I took it apart to figure the Vin and GND. I will post some pictures later. The pinout is not clear.

author: aiq25
author_rank: Regular Contributor
timestamp: July 08, 2017, 10:48:30 pm
content: Quote from: DBecker on July 08, 2017, 08:12:59 pmNo they are not connected to the USB, from what it looks like. My thought is the same, they are probably for communicating/monitoring.

author: stj
author_rank: Super Contributor
timestamp: July 09, 2017, 03:11:50 pm
content: what car are they intended for? just get the car diagram.
Autona125 amp kit - Page 1
Forum section: electronics / projects

author: shaunsparky
author_rank: Newbie
timestamp: February 02, 2022, 06:57:32 am
content: I recently purchased a 125 watt amp kit [cloned version of the original Autona125W KIT from RSE electronics . I would like to know from anyone how they set the bias and how the heat sink was made and the correct mounting of the 2N3055 transistors
Autonomous IC for PD sink (ask for highest PDO) - Page 1
Forum section: electronics / projects

author: dav888
author_rank: Regular Contributor
timestamp: July 16, 2021, 07:26:52 pm
content: Hi,I'm looking for an IC that preferably without code (i2c control or local flash/config needs) would act as a PD sink controller, basically just asking for a PDO of 20V, asserting a pin when it's ok, another pin while it's not.Also good if the part is actually something you can get hold of.
Autoranging in precision circuits - Page 1
Forum section: electronics / projects

author: engineer_in_shorts
author_rank: Regular Contributor
timestamp: July 18, 2014, 12:19:01 pm
content: Hi peeps,How is autoranging arranged in the precision (6digit or more) DMMs?I assume that the input has input resistance forming a divider, and the divider leg is shunted causing range selection controlled by software. If the ADC output saturates then the software just moves the range up, and likewise for small reading move the range down.Is the only protection on the ADC formed by zenners to clamp ? what happens if you dump 500v on the input when the software has the smallest range selected?Does the zenner leakage cause errors?

author: David Hess
author_rank: Super Contributor
timestamp: July 18, 2014, 12:59:23 pm
content: Quote from: engineer_in_shorts on July 18, 2014, 12:19:01 pmIt is done in the same way as a lower resolution instrument but more attention is payed to things like leakage, drift, accuracy, and linearity.QuoteThe output from the divider is buffered by a high input resistance amplifier so adding a high value series resistance for protection before the clamps and after the divider will not significantly affect the input offset because the input current is low. The series resistor is capacitively bypassed for good AC response.Low voltage ranges may bypass the input divider to provide an input resistance much higher than 10 MOhms. Greater than 1 GOhm is typical but the same protection circuit using a high value resistor and low leakage clamp is used.QuoteReverse biased low leakage diodes are used and not zener diodes. The diodes may be bootstrapped from the output the buffer so their reverse voltage is low and constant reducing the effects of leakage. The bootstrapping is needed anyway to drive guards preventing input current leakage from other nodes. In high performance designs, the entire input buffer is likely bootstrapped to increase its input voltage range and increase its linearity.

author: zapta
author_rank: Super Contributor
timestamp: July 18, 2014, 02:34:38 pm
content: Quote from: engineer_in_shorts on July 18, 2014, 12:19:01 pmDave had a video about the input stage of DMM. IIRC the protection was done with a bridge like arrangement of silicon diodes.

author: engineer_in_shorts
author_rank: Regular Contributor
timestamp: July 18, 2014, 03:55:06 pm
content: Quote from: David Hess on July 18, 2014, 12:59:23 pmYes, therefore i am asking where is this 'attention' paid?Quote from: David Hess on July 18, 2014, 12:59:23 pmOK, so I assume the series resistance and clamps are dimensioned so that over-voltage capability equates to a current level which the clamps can handle.Quote from: David Hess on July 18, 2014, 12:59:23 pmOK, got it.Quote from: David Hess on July 18, 2014, 12:59:23 pmOK - i think i need to think about this for a while.Thank you for the knowledge and insight.

author: Vgkid
author_rank: Super Contributor
timestamp: July 18, 2014, 04:13:46 pm
content: Here is an example, solartron 7065
AutoTransformer open circuit over voltage? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: December 30, 2023, 03:30:50 pm
content: I just read this ->https://www.electronics-tutorials.ws/transformer/auto-transformer.htmlIn disadvantages of auto-transformers, the article states:"If the secondary side winding becomes open-circuited, load current stops flowing through the primary winding stopping the transformer action resulting in the full primary voltage being applied to the secondary terminals."I'm trying to make sense of this statement?

author: langwadt
author_rank: Super Contributor
timestamp: December 30, 2023, 03:53:34 pm
content: I assume they mean that if you are reducing the voltage and the lower half of winding breaks you have the full input voltage on the output through upper part of the winding

author: Andy Chee
author_rank: Super Contributor
timestamp: December 30, 2023, 03:59:08 pm
content: If the open circuit occurs at the point I've marked with a red cross, the full primary voltage will appear at the load.

author: Jester
author_rank: Frequent Contributor
timestamp: December 30, 2023, 04:45:26 pm
content: Quote from: Andy Chee on December 30, 2023, 03:59:08 pmThanks, now I see it.I was thinking in terms of the load circuit being open, not the actual transformer winding. I was also considering what happens when feeding with split phase 120/240 andoneof the fuses opens. In both those cases appears fairly benign.A healthy sized MOV @ the load, rated just over the lower tapped voltage will cover an open circuited transformer winding scenario.
AUV Control Software - Page 1
Forum section: electronics / projects

author: Lance
author_rank: Frequent Contributor
timestamp: July 20, 2012, 07:57:53 pm
content: Hi everyone. I'm working on a project at school where we need to build an autonomous submarine. One of the things we're trying to sort out is control software. We currently have three options we're investigating.1. Labview2. Robot operating system3. Run linux and write all of our own control software.We currently have a PC 104 stack running linux, however all the control code is broken. It was written a while ago in Java of all things, and not documented at all. It doesn't work properly anymore, and fixing it isn't really worth the effort.Labview might be a possibility for us despite the insanely high hardware costs, because we might be getting full hardware sponsorship.I've heard good things about ROS, but we're still investigating it.I'm curious to know what the industry commonly uses for controlling vehicles.

author: daedalus
author_rank: Regular Contributor
timestamp: July 20, 2012, 09:32:35 pm
content: Hi,I would ignore labview, its really doesn't save you a lot of time over writing actual code if you can program already.I have used ROS / MRDS a fair bit in the past, and whilst both could be used for your problem, they each have quite a steep learning curve. Also distributed contract based programming is not as easy as plain C/C++.The benefit of ROS/MRDS is that it makes collaboration easier, and allows you to publish your work as reusable modules. The other benefit is if someone has already released modules you can reuse (which might not be that much use for your application).I remember seeing some publications on teams using both MRDS, and ROS for submarines, but I don't know if they published useful source.

author: Lance
author_rank: Frequent Contributor
timestamp: July 21, 2012, 05:32:37 pm
content: Thanks for the input. What we ended up deciding on doing is we're going to build up everything ourselves in C/C++. Next meeting is planning out this monstrosity of a control system. Should be fun.
Auxiliary ADC? - Page 1
Forum section: electronics / projects

author: asg32000
author_rank: Contributor
timestamp: January 21, 2016, 02:30:52 am
content: I'm looking at an ADC, specifically TI's ADS126X series (http://www.ti.com/lit/gpn/ads1263), and I'm trying to decide between the ADS1262 and the ADS1263. The only difference I can see is that the 1263 has an "Auxiliary ADC". This ADC is 24-bit compared to the normal 32-bit resolution on the normal channels. What is an Auxiliary ADC and why would I want one?
Auxiliary supply controller - Page 1
Forum section: electronics / projects

author: tcsaba101
author_rank: Contributor
timestamp: January 02, 2015, 12:38:55 pm
content: I have a 15V 400W chinese made power supply.The auxiliary controller ic has been exploded, also it has blowed the coupling 0ohm resistor (picture).The main PSU circuit works from an external supply.I tried to identify the controller, but couldn't.Hopefully somebody will recognize.I have enclosed the drawing of the circuit, it is a normal very simple smps circuit.I have another of this kind of supply, if something needs to be measured I can.Thanks

author: Seekonk
author_rank: Super Contributor
timestamp: January 03, 2015, 12:27:56 am
content: There are a lot of them out there like the TNY26x series with slightly different pin outs. I thought I had saved a couple to my desktop but can't find them. Responding just so I can bookmark this post for when I do find it.

author: tcsaba101
author_rank: Contributor
timestamp: January 03, 2015, 05:10:32 pm
content: Thanks!Functionally the TNY2X series also fits to this function.I have found two more similar parts:On-semi NCP1027Sanken STR-A6100You gave me the idea to convert the original pin layout by a "pin adapter" and use NCP1027 (anyway I bought some NCP1027-s, before detailed backdrawing........).

author: tcsaba101
author_rank: Contributor
timestamp: January 03, 2015, 08:38:32 pm
content: I have found an almost identical pin layout controller: STR-A6251 -A6252.The only pin what is very different is pin1.On the A6252, this is the Source connection of the power transistor while in the SMPS unit it is probaly a brown-out protection like in NCP1207.The other pins are looks functionally identical.
Availablity of ST devices? - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: September 18, 2017, 08:48:08 pm
content: Hi, I'm just in the process of jumping into looking at some STM32 Devices, In particular the ultra low power devices.The ideal device for me would beSTM32L072KZU6But i'm struggling to see any avaialblity on such devices, and very long lead times.. Is this somethign that is usual for ST devices?

author: DaJMasta
author_rank: Super Contributor
timestamp: September 18, 2017, 09:36:36 pm
content: I've seen a few different micros come and go - do you need a quantity, have you tried contacting ST directly?I get the impression that with all the memory configurations and package options, it's rare for almost every option to be in stock from a retailer, but I'm sure in volume you should be able to get a reliable supply.Do you need the specific device at this phase? Maybe it's worth going with a model with the next level up of flash memory or whatever to get the package and core configuration you are looking at and then move to the exact model later on when they come in stock? That said, I don't see a single L072 series chip available currently at digikey, and only a couple have product images... maybe they are special order/limited run parts from ST?

author: veryevil
author_rank: Unknown
timestamp: September 18, 2017, 10:10:19 pm
content: There is a huge issue currently going on in the industry with component lead times getting longer and longer. From what I've heard ST microcontrollers are one of the worst with huge lead times and poor stock right now.I was told by distributors that last order to be delivered this year from ST were in august.Good luck. If it were me I'd check out a different part. We have had a lot of luck with Silabs Gecko range
avalanche breakdown in field effect rectifiers? - Page 1
Forum section: electronics / projects

author: incf
author_rank: Frequent Contributor
timestamp: April 25, 2025, 04:17:55 pm
content: Field effect rectifiers are new to me.Does anyone know how susceptible they are to failure via avalanche breakdown?I think I have to assume the worst "if it doesn't claim to survive it in the datasheet - it probably wont survive." I know some FETs are very sensitive to it.

author: Kurets
author_rank: Regular Contributor
timestamp: April 25, 2025, 07:48:13 pm
content: Unless I am mistaken it looks like the field effect rectifier is more or less the ST name for what Nexperia calls trench rectifiers, or Diodes Inc call super barrier rectifiers. These are somewhat similar to a depletion mode FET with source and gate tied together.Reverse breakdown in any Schottky diode is a reliability concern. I would not make any circuit design which allows reverse breakdown to happen. Preferably de-rate reverse bias voltage to 70% of maximum to ensure that unexpected spikes or ringing does not cause failure of the device.

author: incf
author_rank: Frequent Contributor
timestamp: April 25, 2025, 08:45:09 pm
content: 100A to 200A inductive transients that occur when a fuse blows in the middle of a 24V power bus are what I'm up against.Not sure what might happen with long enough cabling. Voltages from the inductive transients that occur when a fuse blows will probably greatly exceed ratings of the 40 or 60V rated diodes that are being used. It could easily exceed 600V for a few microseconds.

author: Someone
author_rank: Super Contributor
timestamp: April 25, 2025, 10:35:52 pm
content: Quote from: incf on April 25, 2025, 04:17:55 pmDoes the part have any specifications of the avalanche mode? The answer is right there.

author: incf
author_rank: Frequent Contributor
timestamp: April 25, 2025, 10:45:41 pm
content: ST's field effect diodes don't have those ratings. (single event avalanche, or repetitive)Heck, it seems the vast majority of shottkey diodes don't have them either. A select few have repetitive avalanche ratings, I have yet to come across one with a single event avalanche rating.I'd like to ditch the ST field effect diodes in favor of paralleling some cheap S34 or S36 commodity shottkey diodes. But, I worry about these inductive transients and the lack of published ratings.

author: moffy
author_rank: Super Contributor
timestamp: April 26, 2025, 12:06:51 am
content: Quote from: incf on April 25, 2025, 08:45:09 pmYou need to give the energy somewhere safe to go that suppresses the excessive spike.
AVEL LINDBERG 40/6484 wiring diagram needed - Page 1
Forum section: electronics / projects

author: Inari
author_rank: Contributor
timestamp: May 01, 2021, 07:24:54 pm
content: This big transformer comes from Varilec Philips BV-29 X-Ray machine PSU.Much bigger problem is that i can't find a wiring diagram fot that beast.Is there any wire color code of the Avel Lindberg toroidal transformers windings?Exact part is: 4522-103-99483, this is big transformer 225mm OD and 110mm high and weights ~20kg, at least I hope that I can use primary windings (if I could identify them) and only new secondary must wrap.If somebody maybe guide me of windings identification?There is:RED/BLACK (other ends is ORANGE/BROWN [RED-ORANGE / BLACK-BROWN])PINK/VIOLET (other end is YELLOW/BLUE)(this 4 pairs exit in additional black sleeves)and there is also many other but I quess that this is secondarys.Is there may be some color chart - ``which color start/ends`` (110/115/230/240V connection?) or how to identify them?Thanks for any help.
Average current mode PFC controller - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: November 28, 2017, 07:50:33 pm
content: Hello,Why do they call “Average Current Mode PFC controllers”, “Continuous current mode PFC controllers”?After all, they may well operate totally in Discontinuous mode.Eg the following NCP1653 is “incorrectly” called a “continuous mode pfc controller”http://www.onsemi.com/pub/Collateral/NCP1653-D.PDF

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 28, 2017, 08:03:39 pm
content: "Average" refers to filtering the inductor current waveform so that the control behaves as a linear circuit without switching (or subtracting the triangle waveform from the baseline, to the same end).Average mode control allows smaller ripple fractions and greater current limit accuracy than slope compensated peak current mode does. This makes it particularly useful for low ripple applications, where you might save significant cost on the inductor by using a shitty powdered iron type.This works whether current is continuous or not, because several cycles are averaged over.Tim
Avg. Power consumption calculation - Page 1
Forum section: electronics / projects

author: ArCoN
author_rank: Contributor
timestamp: February 04, 2019, 10:43:54 am
content: Hi AllCan any one help me with this.I have a circuit that use:30uA staticwake up 2 times/sec and uses 3.3mA for 10mS at idleand it do some work 10 times/day and it uses 5mA for 5seci cant get it right, for some reasoni have a 1100mAh batteryI get around 100h in my calc and it is not rightThanks

author: Psi
author_rank: Super Contributor
timestamp: February 04, 2019, 11:03:06 am
content: I got average total current draw of 98.894 uAso 11123 hours

author: ArCoN
author_rank: Contributor
timestamp: February 04, 2019, 11:05:12 am
content: Thanks PsiCan you write how you did it?

author: sleemanj
author_rank: Super Contributor
timestamp: February 04, 2019, 11:09:09 am
content: 5mA for 5s is 0.0069 mAh, 10 times a day, divide by 24 hours 0.00289 mAh in an hour3.3mA for 10mS is 9.1666666666667e-09 mAh, twice a second for an hour is 0.066 mAh in an hour30uA for an hour is 0.03 mAhTotal 0.0988 mAh in an hourI come up then with 11,000 hours (rounded :-))I am probably wrong, I'm really bad at maths.

author: Psi
author_rank: Super Contributor
timestamp: February 04, 2019, 11:14:29 am
content: Here's the workings, excel file attached.But i wouldn't trust this as correct unless someone else gets the same number.(Edit, looks like sleemanj also got 0.0988 mAh and round 11,000 hours )

author: ArCoN
author_rank: Contributor
timestamp: February 04, 2019, 11:27:52 am
content: Thanks a lot

author: Psi
author_rank: Super Contributor
timestamp: February 04, 2019, 11:34:06 am
content: No problem
avometer restoration - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: September 16, 2021, 04:37:07 pm
content: HI all,i am currently restoring a 1953 avometer 8x panclimatic,can anyone tell me what colour the original steel outer case was,or should be,i have stripped and derusted mine and self etch primered it,it had many layers of paint on it ranging from black orange and looked like the bottom layer was a gold hammer finish,i always thought they were a russet brown color ,any ideas so i can order the paint,cheers in advance,i have searched the net but no luck.
AVR JTAGICE II FFC adapter - Page 1
Forum section: electronics / projects

author: Zoli
author_rank: Frequent Contributor
timestamp: July 19, 2025, 10:38:12 pm
content: I was unhappy with the connectivity of the JTAGICE II, so I've decided to make a FFC to 6pin IDC male adapter. I've identified the used lines on the FFC, built a PCB, now I can use the TAG-Connect adapter.Connectors used:1. 30pin FFC: TE Connectivity 3-1734839-02. 6pin IDC: Würth Elektronik 61200621621Project(KiCAD 8.0), Gerbers and .pdf of the schematics attached.Edit: typos.
AVR "modding", adding features or removing them [help] - Page 1
Forum section: electronics / projects

author: ESXi
author_rank: Regular Contributor
timestamp: June 29, 2019, 12:03:13 pm
content: Hi,I have been reading and looking at some mods for chips and such. Back in the days I have seen some small tricks like reading AVR chip output and at some pattern of which the chip is doing some security check or executing some bull$hit the chip's VCC/VDD is quickly (μs) turned off and then on again so it skips this part of the code basically or corrupts the instruction at that time (technically not the best approach because the timing is critical and kinda hard to get right each time & reliability because if its timed wrong the chip can crash/reset..)So I came up with another approach that might work better. Read ISP data from the AVR that goes to the 8 bit Led display and if a specific signal pattern is detected send simulated button press to AVR (simulate button press with p or n channel mosfet). So for example my small portable speaker has gone completely flat(empty battery), I charge it up and power it up again. Now it wants me to set the time clock again. I want to check if the data sent to the display is "00:00" blinking, if it detects this, it has to simulate two button presses and the clock set feature is like skipped basically, so the volume knob can be used again without having to skip it manually.. By the way I think it was more than just two button presses, but ok you get the idea.Like this;https://forum.mysensors.org/topic/9061/how-to-automate-devices-with-existing-buttons?Thing now is, how and is it even possible to read ISP and do a specific thing if it sees a pattern of data how difficult is this?Probably need a Bus Pirate or a Oscilloscope? Will a Attiny85 be good enough for the job?At first I wanted to mod the firmware on the megawin mpc82. But I gave up at that, a debugger dongle is like 70 dollars on Ali, it doesn't guarantee anything and also the chip is completely non documented (the protocol to read/write the chip). So forget about dumping the chip anyway..Was thinking about it because of this topic I made a while ago..https://www.eevblog.com/forum/projects/360-speaker-time-clock-removal-megawin-mpc82-(help)/Briefly but good example of glitching avr chiphttps://flawed.net.nz/2017/01/29/avr-glitch-modifying-code-execution-paths-using-only-voltage/
AVR + Sixthlogic DAB DAB+ FM Digital Radio Development Board - Page 1
Forum section: electronics / projects

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 23, 2015, 10:22:08 pm
content: Hello, did anybody use the Monkey Board/SixthlogicDAB DAB+ FM Digital Radio Development Board Pro with SlideShow?http://www.sixthlogic.com/products/85-developmentboard/85-dab-dab-fm-digital-radio-development-board-prohttp://www.monkeyboard.org/products/85-developmentboard/85-dab-dab-fm-digital-radio-development-board-proIs it possible to control it with an AVR MCU, e. g. ATmega32? There is UART and I2C bus.There is a Keystone T2_L4A_8650C FM / DAB module used.http://forum.arduino.cc/index.php?topic=116228.msg891503#msg891503

author: jpliew
author_rank: Newbie
timestamp: June 27, 2015, 05:22:52 am
content: Hi Hydrawerk,Yes. You can erase the PIC18F14K50 and use Atmega to control the module. There is only UART option available.CheersJP

author: Hydrawerk
author_rank: Super Contributor
timestamp: June 27, 2015, 01:18:31 pm
content: Thank you for your answer, but I am not going to work on this topic.
AVRDUDE (equivalent) running on an ATMEGA ? - Page 1
Forum section: electronics / projects

author: SL4P
author_rank: Super Contributor
timestamp: March 11, 2018, 03:49:57 am
content: I’m trying to find a serial uploader that runs on an Arduino style processor.There are some low-end solutions, but they only work with the simplest (small memory) target processors.My path is as below, the issue i’m facing is the larger FLASH size, which isn’t supported by the basic uploaders/crossloaders that are available. Of course AVRDUDE works fine on Windows/ Linux, But hasn’t been ported to ATMEGA, for obvious reasons.HEX file from PC -> SD cardSD card -> Uploader (AVRDUDEequiv.) running on Arduino or other ATMEGA ->(later...) -> Serial Bootloader (Optiboot) -> ATMEGA 1284P (or other large memory ATMEGA processor).

author: Kleinstein
author_rank: Super Contributor
timestamp: March 11, 2018, 09:11:26 am
content: I don't know of such a solution. However the step from having a solution to do the transfer of small data files towards the transfer of larger files and with a slightly different boot-loader should not be that large. The required functionality is much less than the full AVRDUDE.Chances are you could find a solution to run on something like an Raspberry.

author: SL4P
author_rank: Super Contributor
timestamp: March 11, 2018, 09:31:22 am
content: Thanks... yes, I’d thought about Pi (Linux uploadets already exist - including avrdude), but I’m hoping toMake an ultra low cost kit that I can mail out for firmware updates by non technical users. No real loss if they get damaged or lost.I had a look at the existing Arduino uploaded, but a)they’re ppprly written / hard to understand, and b) the functionality they’re missing is to receive himself the extended addressing sentences on the incoming hex files. They’re good for the low 32KBytes, but nothing after that.

author: bingo600
author_rank: Super Contributor
timestamp: March 11, 2018, 09:32:19 am
content: Maybe you could hack this one to fit >64Khttps://spaces.microchip.com/gf/project/sdbootloader/Or is it a standalone programmer you need ?https://www.eevblog.com/forum/buysellwanted/wts-avr-isppdi-v3-standalone-programmer/msg760432/#msg760432Or as suggested a RasPIEdit: It might even work for <= 128K (1284)https://www.avrfreaks.net/forum/clawsons-sd-bootloader-implementation-bigger-avr?skey=sd%20bootloader/Bingo

author: paulca
author_rank: Super Contributor
timestamp: March 12, 2018, 02:25:49 pm
content: Would the first hurdle not be the single serial port on the ATMega? Do some have two?Surely if you just got the source for the Arduino bootloader you could figure out how to run it in reverse to flash another ATmega over serial.You would of course need another flash memory chip unless you can fit the ATMega uploader program + the uploadee into the 32K of the ATMega.If you can find a cheap source of tiny micro flash cards you could always build one into the uploader, send the customers one uploader and then send them SSD cards from then on. You could of course just build an SSD card into the original product.
AVX CK05 dielectric class - any ideas? - Page 1
Forum section: electronics / projects

author: SingedFingers
author_rank: Frequent Contributor
timestamp: March 06, 2017, 12:53:33 pm
content: I've got a board here with a slightly destroyed good old CK05 capacitor on it thanks to a resistive neighbour gone up in smoke.I'm replacing it but for the life of me I can't find the dielectric properties of the CK05 line capacitors. Are these Y5V / X7R / C0G / what? They are 10% tolerance ceramic multi-layer and that's all I can find. Even the datasheet doesn't say a damn thing.I ask because I've only got a substitute X7R for that value so it means I have to order a replacement if it's a C0G dielectric which I want to avoid.

author: daveshah
author_rank: Unknown
timestamp: March 06, 2017, 01:04:05 pm
content: According to mouser they're X7R

author: SingedFingers
author_rank: Frequent Contributor
timestamp: March 06, 2017, 01:22:07 pm
content: Thanks. I didn't look at Mouser annoyingly. I will sub an existing X7R I have in. Thanks again.

author: TimFox
author_rank: Super Contributor
timestamp: March 06, 2017, 04:28:15 pm
content: Yes, CK05 is X7R. CC05 is NP0/C0G.

author: SingedFingers
author_rank: Frequent Contributor
timestamp: March 06, 2017, 05:07:46 pm
content: Cool. Thanks for clearing that up.Part replaced with a cheap X7R part and working
Awesome Android/Windows Phone/Blackberry App - Page 1
Forum section: electronics / projects

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: February 02, 2013, 11:14:19 am
content: It has everything from resistor color codes to inductor coils measuring this app will help you a lot.Electrodroid.https://play.google.com/store/apps/details?id=it.android.demi.elettronica&hl=elWebsite of the apps creator.http://demisoft.altervista.org/_siti_interni/electrodroid/

author: Longtimetech
author_rank: Newbie
timestamp: February 10, 2013, 12:40:13 am
content: This is a great electronics aid. Thanks for the heads up.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 16, 2013, 02:48:42 pm
content: Quote from: ChrisGreece52 on February 02, 2013, 11:14:19 amNice, but I wonder why there is a free version for Android but not for Windows Phone, and apparently (based on the comment) the WP version doesn't even contain all features of the Android version. That's certainly not great for a paid app.On WP I can recommend 'ElectoInfo'. It's much more basic but it does what it say on the tin, and it's free.

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: February 16, 2013, 04:08:18 pm
content: I put these on my iPhone , Electronics toolbox Prohttp://creating-your-app.com/electronic-toolbox-pro/and RF Toolbox Prohttp://iosstore.org/app/593044099/
Awesome Coffee - Page 1
Forum section: electronics / projects

author: ludzinc
author_rank: Unknown
timestamp: March 21, 2013, 12:10:20 pm
content: HiJust thought I'd share this write up I did for part of the controls I put together for a professional coffee roaster for a uddy of mine.Cheers,Simonhttp://ludzinc.blogspot.com.au/2013/03/awesome-coffee.html
AWG Wire Padstack Calculation - Page 1
Forum section: electronics / projects

author: tarun172
author_rank: Regular Contributor
timestamp: August 03, 2013, 10:15:07 pm
content: Hello,I am creating a new footprint for 18 AWG wire. This footprint will be used in a PCB Board layout I am working on. I did some calculations and seem to pretty simple but I cannot wrap my head around to see if this is correct.This hole cannot be larger than 1.65 mm. Here are my calculations:18 AWG Wire diameter: 1.024 mm. So Drill size needs to be 1.024 mm minimum. Diameter of annular ring will be 1.4 mm, giving me a margin of 0.3 mm (x-y type circle calculations). I am setting a circular ring of 1.65 mm in silkscreen.Settings on ORCAD Layout:T1 Padstack Spreadsheet:DRILL pad width: 1.024 mmDRILLDWG pad width: 1.024 mmTOP layer pad width: 1.4 mmBottom Layer: 1.4 mmSoldermask top and bottom: 1.65 mmDoes anybody see manufacturing issues or issues in general here?- Tarun

author: Rufus
author_rank: Super Contributor
timestamp: August 03, 2013, 11:40:02 pm
content: 18 awg is 1.02 mm only for single strand. 18 awg in multiple strands is up to 1.27mm and you have tolerance on the holes and you want some slack or you will have to fiddle around getting the wire in the hole, especially if it is multi strands.18 awg is good for around 11A for typical equipment wiring and is 0.82mm^2 copper. You couldn't connect a similar area of copper or track with 11A current capacity to a small pad. What you are asking for doesn't seem to add up, or maybe your wire gauge is just way overkill.

author: tarun172
author_rank: Regular Contributor
timestamp: August 04, 2013, 01:36:00 am
content: @Rufus. Thank you pointing that out. Yes, I am looking for solder 18 AWG multistranded wire. One of my concerns was would the hole be too small. That answers that question. I understand that 18 AWG Wire is more than what I need (but this is something I was told work with). However, the questions still remains? If I have 1.34 mm as drill size and 1.55 mm as diameter of annular ring (total 1.65 mm pad size) would that cause manufacturing issues?I cannot go over 1.65 mm total diameter size.- Tarun

author: Rufus
author_rank: Super Contributor
timestamp: August 04, 2013, 02:33:49 am
content: I got the 11A wrong, it is more like 16A.It still doesn't add up. Where is this 1.65 maximum coming from?18/30 hook up wire with 300v rated PVC insulation has 1.2mm diameter conductor and 2mm overall diameter. It isn't going to fit on a 1.65mm pitch and will be very hard to fit in a 1.35mm hole with a typical +/- 0.1mm tolerance. You need to check with whoever will make the boards but you will probably be paying extra for less than 0.25mm annular ring which would make the pad 1.85 and still not be much to solder to.