hybridfree/eevblog-posts huggingface dataset:
Bourns incremental encoders not really quadrature - Page 1
Forum section: electronics / projects

author: Dave
author_rank: Super Contributor
timestamp: May 28, 2016, 03:24:16 am
content: Here I am, programming a microcontroller to read an incremental encoder for a circuit that I'm working on and wondering, why the state machine, that I coded for the encoder, isn't working as it should.I coded the state machine to follow along as the signals A and B go high or low and added in a safety that throws an error if the state machine tries to skip a step in the quadrature. I flashed the code into the chip, expecting it to work as planned, but to my demise, it seemed to throw an error every time I turned the knob.So I went ahead and looked at A and B signals on the encoder. Here's the interesting part:As I ever so slowly turned the axle clockwise, both A and B were pulled to ground in the exact same moment and only jumped up one after the other.So instead of this (taken from the datasheet),what I really have is this.Now I know that it still outputs a signal which can be used for detecting rotation and direction, but this isn't the point. Thedatasheetsays the signal is quadrature, but there are only three different states which can be found on the output.Just to make sure that I'm not crazy (and because I happened to have a spare), I decided to check the other one as well. Same story.Does anyone have an idea what might be going on? I bought these encoders directly from Mouser, so I don't think they are counterfeits (they look and feel pretty solid).The exact part number is PEC16-4120F-N0012.

author: rs20
author_rank: Super Contributor
timestamp: May 28, 2016, 03:50:30 am
content: I think you've got your wiring wrong. If you have the wrong pin on your encoder wired as the "common" pin, it'll end up outputting A and (AB), not A and B. Which is consistent with what you're seeing.

author: Dave
author_rank: Super Contributor
timestamp: May 28, 2016, 04:04:05 am
content: Quote from: rs20 on May 28, 2016, 03:50:30 amI'm an idiot.But you can see how this confused me.Welp, time to pull out a knife and make my PCB look like shit.There, mystery solved. Nothing to see here.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 28, 2016, 08:19:17 am
content: 1. Because3. Sense.2. this makesTim

author: Fungus
author_rank: Super Contributor
timestamp: May 28, 2016, 10:41:17 am
content: Quote from: Dave on May 28, 2016, 03:24:16 amNot possible. Nothing would work with them.Check results again.Quote from: Dave on May 28, 2016, 04:04:05 amWe've all been there!Difference: Idiots don't learn from mistakes.Quote from: Dave on May 28, 2016, 04:04:05 am

author: Refrigerator
author_rank: Super Contributor
timestamp: May 28, 2016, 10:47:22 am
content: Quote from: T3sl4co1l on May 28, 2016, 08:19:17 amI guess they hired Yoda to make that PDF.

author: Dave
author_rank: Super Contributor
timestamp: May 28, 2016, 02:38:54 pm
content: I feel like I owe you guys some post-bodge pics.She does work as expected now. The state machine works like clockwork.
Bourns MF-SM resettable fuse datasheet error? - Page 1
Forum section: electronics / projects

author: maxkl
author_rank: Newbie
timestamp: March 21, 2021, 05:43:22 pm
content: Hi from a silent reader (until now!),I've been looking at resettable (PPTC) fuses for a circuit I'm designing. While reading the datasheet of the Bourns MF-SM series (https://www.mouser.de/datasheet/2/54/bourns_mfsm-1159445.pdf) I stumbled across the "Typical Time to Trip" figure on page 3 (the lines are a bit hard to differentiate, so I marked the two interesting ones):The line for the 1.8 A model (MF-SM185) is consistently below the line of the 1.5 A model (MF-SM150). At the same current I'd expect the 1.5 A model to always trip before the 1.8 A model. But according to the figure the opposite is true. How can that be right? Did they swap the labels? The values in the tables are what I'd expected them to be.I've never used a PPTC fuse in a design before so I'm not familiar with their intricacies. It's not critical to my current project but I'd still appreciate any insights if somebody has an idea what's going on here.
BQ2002 Fast Charge Issue - Page 1
Forum section: electronics / projects

author: Abdurrahman YAMAN
author_rank: Newbie
timestamp: September 23, 2022, 11:29:12 am
content: Hey all,I am trying to implement a NiMh charger with BQ2002 IC from Texas Instruments. I have followed reference design with no major changes. I am challenging a bizarre problem;- Whatever I have done the IC doesn't go fast charge except heating the thermistorWhen I heat the NTC which integrated in the battery pack, the IC goes the fast charging state.I have a fear that I am missing small problem on the schematic, can anyone check the schematic for me? What can cause the problem?Thanks a lot...Reference design:https://tinyurl.com/4z6b9jtxDatasheet of the IC:https://tinyurl.com/2523842t

author: jwet
author_rank: Frequent Contributor
timestamp: September 23, 2022, 01:48:20 pm
content: You have to make the Temp sensor input happy. It triggers at 2.5v. In the ref design, they have an R in parallel with the thermistor etc. Get a handle on the your pack thermistor and set it up so it in the right range. BQ thinks that batt is cold is problem.

author: Abdurrahman YAMAN
author_rank: Newbie
timestamp: September 23, 2022, 01:54:39 pm
content: I have received information from Texas Instruments. Here is the reply;QuoteWhen I change the value of R216, problem solved. I hope the information will help others...
BQ2057WSN battery charger test - Page 1
Forum section: electronics / projects

author: user1991
author_rank: Newbie
timestamp: July 30, 2022, 10:46:06 am
content: Hi,I am building a circuit to charge a Lithium-polymer battery using a BQ2057WSN.Now, I am thinking how can I test this circuit. I am planning to use a multimeter to check the charging current and voltage, and to measure the temperature of the MOSFET with a thermocouple. I am wondering what kind of tests I can also do and how I can discharge the battery during the test?Please find the attached circuit schematic below.Thank you,
BQ2057WSN Charging issues - Page 1
Forum section: electronics / projects

author: aakash dey
author_rank: Contributor
timestamp: July 23, 2019, 08:49:59 am
content: I have designed a battery charging Module using BQ2057WSN IC to charge a 7.4V,6600mAH Li-ion battery. According to my calculation the charging current is set at 625mA.The input power source to the Charging module (DC+) is 12VDC, 2A SMPS and the circuit is drawing 625mA from the Power source (SMPS). Now, I have connect a multi meter in series with the battery pack as shown in picture to see how much current the battery is drawing. I have found the multi meter reading as 250mA. The measure battery voltage is 7V, which means the battery is not fully charged.So, my question is, if the charging circuit is drawing 625mA from the power source, why only 250mA current is drawing by the battery while charging? The battery should also draw the same amount of current (625mA), isn't it?

author: jbb
author_rank: Super Contributor
timestamp: July 27, 2019, 12:10:03 am
content: Thanks for posting schematics.First thought: is anything getting hot?Second thought: do you have a second multimeter? It could be that when you connect the multimeter in series with the battery, the burden voltage (i.e. drop across multimeter innards and test leads) is quite high. This could make the battery charger reduce the charging current. Try measuring the voltage across Rsns with a second meter if you can.
BQ24079 resistor value help - Page 1
Forum section: electronics / projects

author: UncookedCorn
author_rank: Contributor
timestamp: November 13, 2023, 12:14:06 am
content: I am trying to charge an 18650 3.7V 3500mAh battery with this battery charger IC. Looking at the datasheet for the device I am confused why they chose the resistor values for the pins and was wondering if it would be the same for any battery. Could someone explain how the values are chosen?

author: amyk
author_rank: Super Contributor
timestamp: November 13, 2023, 12:32:14 am
content: Read section 10.2 of the datasheet.
BQ24192: Inductor at BQ24192's SW pin. - Page 1
Forum section: electronics / projects

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: June 30, 2018, 09:05:52 am
content: Hello,Part Number: BQ24192The inductor value mentioning in the datasheet is 2.2uH, actually, my application requires around 2.5A load current peak + Battery charging(500mA to 1A is also okay), and the input voltage will be in the range of 4V to 9V.The 2.2uH inductor suggested is very large in size, what will be the cons if I use 1uH/1.2uH inductor for my application mentioned above??Thanks in advance.
BQ24195L not charging - Page 1
Forum section: electronics / projects

author: okw
author_rank: Frequent Contributor
timestamp: September 05, 2023, 11:05:12 am
content: I have designed a circuit with BQ24195L that will not charge. System pin outputs about 4.1V when VIN is 13.5V, and drops to Li-Ion (3.7V) when 13.5V is disconnected, so it's at least doing something.The waveform, shows DC periodically drops to around 0V when trying to charge. I suspect the buck is unable to start (component selection? inductor DRC?).I have followed the Typical Application on page 34 of the datasheet, but omitted Q1/Q2 circuit, Q3/R11. OTG is not used and floating.Inductor is a 2.2uH (3.3A, 68mOhms DCR).NTC 10k with 5.6k/33k resistors.I feed it with 13.5V and have a single cell connected. Charge enable is pulled low.I have read all the registers and see all conditions are ok, for example REG01[5:4] = 01. Watchdog kicks in after some time.When I connect a multimeter in series, I see the battery is fed (charged?) 82mA, but in pulses. Cycles between 82mA for around 2-3 second, then drops to 0mA for a few seconds). Same behaviour can be seen in the waveform on the SW node. I attached both DC and AC waveforms.I've also asked in the TI forum, but maybe someone here has ideas?
BQ24257 ready state? - Page 1
Forum section: electronics / projects

author: rexxar
author_rank: Frequent Contributor
timestamp: September 12, 2014, 05:08:38 am
content: Hi all, I'm using theBQ24257Li-Ion charge controller in my project, but it's not working, and it's driving me crazy!What's going on is that when I query the device over I2C for the charging status, it reports "ready". Thing is, the ready status isn't documented in any datasheet I can find. I seem to recall reading somewhere that "ready" means the device is powered up and waiting for a battery to be connected, but I don't remember where I saw that, and I can't find it again.Weird thing is, I've gotten it to work a couple times. Last time it worked completely reliably, but once I uploaded some new code, it broke again. Of course it didn't work when I uploaded the old code... I did stick a logic analyzer on the I2C bus just to make sure my code isn't interpreting the data wrong, but that looks fine.Anyone have any ideas?

author: amyk
author_rank: Super Contributor
timestamp: September 12, 2014, 12:29:27 pm
content: What do the rest of the status registers say?To me "ready" also means it's waiting to charge a battery.

author: rexxar
author_rank: Frequent Contributor
timestamp: September 14, 2014, 05:11:55 am
content: Here's the registers as I've got them configured:000100000011110110000000100010100000011000

author: amyk
author_rank: Super Contributor
timestamp: September 14, 2014, 12:59:27 pm
content: Register 3 says "Apple/TT or non-standard adaptor detected". What do you have it plugged into? Try setting bit 4 in register #5 to tell it to re-detect. If it still won't charge, set bit 3 of reg #7 to force a battery detection and check the status in reg #1.
BQ24261M Configuring Regulated Voltage - Page 1
Forum section: electronics / projects

author: sezerorak
author_rank: Newbie
timestamp: October 07, 2020, 01:11:49 pm
content: Hello,I'm using a BQ24261 on the power management path of my IoT device. The device's connectivity module needs to run on 3.7V and I'm supplying this voltage with the BQ24261, I've chosen this module because the IoT device is configured to run on battery (3.7V) in given instances. Everything ran smoothly until I noticed that sometimes the connectivity module dies in between data send intervals, so I hooked up my oscilloscope and noticed that if I don't hook up my 3.7V battery to the BAT pins of the BQ24261, it only regulates 3.4 Volts, which doesn't sound like a big issue but during send intervals the connectivity module pulls enormous currents and the voltage across the pins drops about 0.3 - 0.5 Volts, which sometimes kills the device.I'm attaching my oscilloscope screenshots and my schematics. How do I configure this BQ24261 so that it runs on 3.7 Volts even when there isn't any battery attached?
BQ24401D 1 cell charger troubleshooting - Page 1
Forum section: electronics / projects

author: JannB
author_rank: Newbie
timestamp: July 12, 2023, 12:35:15 pm
content: Hallo everyone,I am new to the forum so I am open to any suggestions regarding content and layout of this post.I tried to use the BQ24401D as a single cell NiMH charger (See attached schematic).As with all my new projects I rebuild the published design in the related data sheet.Link:https://www.ti.com/lit/gpn/bq24401The circuit seems to work at first glance but it will not change into fast charge mode. It seems to stay in pre-charge all day long.In the schematics beeing attached I marked parts of the circuit where I thougth they match with the corresponding data sheet(Maximum Charge Time; Battery Voltage Control; Charge Current Control; etc.)I tested the circuit with an electronic load and a 1 cell battery (VARTA; Type AA; HR6|1,2 V; Ni-MH; Art.-Nr.: 56676).What I have done yet:- Measure BQ24401D:8 (MOD-pin)- Measure voltage and current while chargingI would be glad for any kind of support.I tried to contact Texas Instrument as well but there forum seems to be for business customers only.For further information do not hesitate to reach out.My Equipement for troubleshooting:Oscilloscope: RIGOL DS1054Z (Off the shelf probes as well as an current probe Micsig(R) CP2100B)Power Supply: PeakTech(R) 6225 AElectronic Load: KORAD KEL1023x DMM

author: ElectronicsHobbyist
author_rank: Contributor
timestamp: August 29, 2023, 11:30:42 pm
content: One problem I see is that you didn't connect an NTC Temperature sensor. That way the voltage on the TS Pin will be 0.64 x VCC which the IC will detect as a low temperature fault (see page 12 of the datasheet). That way it will always stay in the "battery conditioning" phase of charging.I hope this helps

author: JannB
author_rank: Newbie
timestamp: September 05, 2023, 05:44:14 pm
content: Thank you for pointing this one out.I didn't insert the NTC on purpose. I thought I can get it running without it.Herehttps://www.ti.com/lit/pdf/slua064I found an application note from TI with further information (See page 6).There the author points out to apply a voltage between 1.25 V and 2 V to the TS pin (With respect to Vcc and Vss).I tried this as well without entering the fast charge mode.I will try to design a circuit from the ground up using the datasheed instead of modifying the given circuit (Fig. 7 in the corresponding data sheet).
BQ24610 - input vs vbat on system out - Page 1
Forum section: electronics / projects

author: diminatto
author_rank: Contributor
timestamp: July 06, 2025, 01:22:58 am
content: Hello, i´m desining a circuit for charging a 4S2P lithium ion battery pack (copying the eval board and changing what i need). I ended up choosing BQ24610 for it. While researching i got a little bit confused, in my undesrtanding it will cut the battery from the system using the batfet and open the two way switch so it starts feeding the system from the adapter, am i right about how it works or there is something i´m missing ?

author: m k
author_rank: Super Contributor
timestamp: July 10, 2025, 07:22:17 pm
content: Figure 24 (p. 32/45) has a simplified system.
BQ246X  Quiescent current  - Page 1
Forum section: electronics / projects

author: useer
author_rank: Newbie
timestamp: June 29, 2016, 01:08:32 am
content: Hi,I am looking for Li-Ion battery charger IC that would draw almost no current (<5uA) once the charger has been removed.I mean with all resistors and FETs connected. It has to be able to deliver high charge current, > 3-4 AmpIn this regard has anyone had practical experience with BQ24600? The datasheet claims <15uA idle current, but I am not sure how real this is and what it is at the room temperature.Cheers.
BQ25703A Would not accept charge commands! - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 30, 2018, 11:56:04 am
content: Hi,I have designed a sample board to play with the BQ25703A, the problem is that I can read and write every register, but when I try to write these commands,ChargeCurrent,MinSystemVoltage,BQ25703A seems to reset and do not accept the commands.Also when the battery pack is disconnected the ChargeOption0 command would take effect, but when I connect the battery pack it would not get the values.Here is some parts of my codeCode:int status;//ChargeOption3 Reset All Registers to defaultBQ25703WriteReg(0x34,0x6000);//ChargeOption0BQ25703WriteReg(0,0x060E);status=BQ25703ReadReg(0x0);//ChargeOption1BQ25703WriteReg(0x30,0x9211);status=BQ25703ReadReg(0x30);//ChargeOption2BQ25703WriteReg(0x32,0x02BF);status=BQ25703ReadReg(0x32);//ChargeOption3BQ25703WriteReg(0x34,0x0000);status=BQ25703ReadReg(0x34);//ProchotOption0BQ25703WriteReg(0x36,0x4A54);status=BQ25703ReadReg(0x36);//ProchotOption1BQ25703WriteReg(0x38,0x1000);status=BQ25703ReadReg(0x38);//ADCOptionBQ25703WriteReg(0x3A,0xE0FF);status=BQ25703ReadReg(0x3A);//MaxChargeVoltageBQ25703WriteReg(0x04,0x41A0);status=BQ25703ReadReg(0x04);//ChargeCurrent @1ABQ25703WriteReg(0x02,0x0400);status=BQ25703ReadReg(0x02);//MinSystemVoltage @14.336VBQ25703WriteReg(0x0C,0x3800);status=BQ25703ReadReg(0x0C);//IIN_HOST @1ABQ25703WriteReg(0x0E,0x1400);status=BQ25703ReadReg(0x0E);//InputVoltage @8.192BQ25703WriteReg(0x0A,0x2000);status=BQ25703ReadReg(0x0A);//OTGVoltage @12.67VBQ25703WriteReg(0x06,0x2000);status=BQ25703ReadReg(0x06);//OTGCurrent @1.6ABQ25703WriteReg(0x08,0x2000);status=BQ25703ReadReg(0x08);read and write functonsCode:void BQ25703WriteReg(int add,int data){static HAL_StatusTypeDef mySTs;unsigned char write_message;write_message=add;write_message=data;write_message=data>>8;mySTs=HAL_I2C_Master_Transmit(&hi2c1,BQ25703_ADD,write_message,3,1000);}int BQ25703ReadReg(int add){int res=0;unsigned char write_message;write_message=add;unsigned char read_data={0};HAL_I2C_Master_Transmit(&hi2c1,BQ25703_ADD,write_message,1,1000);//start to read RTC DataHAL_I2C_Master_Receive(&hi2c1,BQ25703_ADD,read_data,2,1000);res=(read_data<<8) | read_data;return res;}Do you have any Idea what's wrong?
bq51013B qi reciever range configuration - Page 1
Forum section: electronics / projects

author: Dajgoro
author_rank: Frequent Contributor
timestamp: April 29, 2017, 08:14:32 pm
content: HiI'm working on a project, and I'm using the bq51013B wireless reciever IC.It all works fine, except that when offsetting the receiving coil from the charger(transmitting) platform the charger keeps pushing more current so that it can still transfer power to the receiving coil.It can go up to 700mA at 5V which is 3.5W of dissipation even if the load on the other side is minimal, which causes the charger to heat up. Whats the easiest way to adjust the distance at which the power transfer is broken?In the datasheet there is a FOD pin for Foreign Object Detection which on the eval module is tied via resistor to the current limit pin. I tried adjusting the current limit, but it has no effect on this.Edit: The cause of the FOD not affecting anything might be from using a non WPC v1.1 compliant charging pad.
BR-2/3A Battery Replacement - Page 1
Forum section: electronics / projects

author: bostonman
author_rank: Super Contributor
timestamp: August 09, 2022, 01:05:52 am
content: I have a piece of equipment with a dead BR-2/3A 3V battery with solder tabs (solders to PCB) used to keep settings in memory. From memory, I'd estimate the battery is twenty-years-old, so it's not getting depleted quickly.I'm finding some quite steep prices for these and wondering if the cost is due to the battery power or its unique style.If it's just the style, does anyone know of a cheaper replacement that would be more cost effective?

author: TheMG
author_rank: Frequent Contributor
timestamp: August 09, 2022, 01:39:41 am
content: https://www.digikey.ca/en/products/detail/panasonic-bsg/BR-2-3AE2SP/64350They're $5.46 in one-off quantity from Digikey, which is really not that bad at all, considering they have about 5x the capacity of a CR2032.

author: bostonman
author_rank: Super Contributor
timestamp: August 09, 2022, 01:57:50 am
content: I should have added that DigiKey has them cheaper than Amazon, which I found very odd.I mainly asked because I wanted to confirm that I wasn't wasting my money when I could buy something compatible that's cheaper.

author: alm
author_rank: Super Contributor
timestamp: August 09, 2022, 09:29:19 am
content: Any primary Lithium 2/3 A 3.0V cell with solder tabs or wires should work. BR-2/3A is just the Panasonic name. $5 is the ballpark price I would expect to pay.

author: tooki
author_rank: Super Contributor
timestamp: August 09, 2022, 05:46:46 pm
content: Quote from: bostonman on August 09, 2022, 01:57:50 amIt shouldn’t. Amazon’s pricing on electronics parts aren’t usually particularly good. (When they are, there’s a good chance they’re fake.) An ever since Amazon reimagined itself as a flea-riddled bazaar, it’s full of vendors, some of whom try to charge usurious prices for items there aren’t many listings for.

author: tooki
author_rank: Super Contributor
timestamp: August 09, 2022, 05:48:58 pm
content: Quote from: alm on August 09, 2022, 09:29:19 amJust a reminder that the voltage matters: this size battery exists in two different chemistries, one at 3.0V, the other at 3.6V.

author: bostonman
author_rank: Super Contributor
timestamp: August 09, 2022, 05:55:42 pm
content: I'll plan to order them from DigiKey (although the price was a no-brainer).I'm trying to think if I need anything else before I spend money on shipping. Twice I got bit because I placed an order, and later realized I needed other stuff.

author: TheMG
author_rank: Frequent Contributor
timestamp: August 09, 2022, 06:40:25 pm
content: Quote from: bostonman on August 09, 2022, 05:55:42 pmI've done that myself, multiple times...

author: bostonman
author_rank: Super Contributor
timestamp: August 09, 2022, 06:50:18 pm
content: I think if you create a user account, then you can add after submitting an order, but not certain.One time I sent an email asking to add a component and they responded after my order got shipped stating it was too late.
Brainstorm: ultra fast programmable control loop - Page 1
Forum section: electronics / projects

author: b_force
author_rank: Super Contributor
timestamp: September 19, 2016, 01:26:02 pm
content: Just bumped into a discussion with someone.(you know, late Saturday night brainstorm discussion)Just out of curiosity, what would you do with an ultra fast programmable control loop with high res ADC feedback in and fast PWM out?Mostly talking about practical solutions, like current sense for amplifiers, power supplies, audio related stuff etc, but I bet there are many more options.So what are your ideas?

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: September 19, 2016, 02:46:06 pm
content: 'Ultra fast' compared to what? How fast does a control loop for a given application really need to run? If you are controlling the temperature of an oven for example reading the temp at 10kHz is a waster of time as the temperature will not change quickly enough to warrant that. Sounds like your trying to design a solution and then find the problem

author: b_force
author_rank: Super Contributor
timestamp: September 19, 2016, 02:57:17 pm
content: Fast as in a few ns. Say 10 - 50nsLike I said, just a brainstorm. We were just wondering were things could be improvedThe discussion started with something like that someone thought there wouldn't be any more improvements because faster is not needed.I mean nowadays there are ucontrollers and DSP's everywhere, but are there fields where they still scream and yell to get more speed?Specifically in control loops compensation loops.Just curiosity.
Brake light Relay Switch - Page 1
Forum section: electronics / projects

author: jsi
author_rank: Regular Contributor
timestamp: December 08, 2016, 12:47:09 am
content: Hey all,I like to celebrate the christmas spirit in a little different way by decorating my truck with 110V LED light strings. My truck has a single 110 volt outlet from the factory so that is where the power comes from. This year I want a string of lights to turn on and off with the brakes and I want an other string to be on constantly. I've drawn out the attached schematic and I was hoping for some feedback. The whole thing seems pretty simple, but I afraid of traps for young players. Can you kind folks let me know what you think.
Branching Power Splitters - Page 1
Forum section: electronics / projects

author: openyk
author_rank: Contributor
timestamp: March 09, 2024, 04:40:10 am
content: Anyone know something like Hirose DF51B (signal branching adapters) but for power 14A+, without the typical double wired terminal crimping?

author: Terry Bites
author_rank: Super Contributor
timestamp: March 09, 2024, 09:28:40 am
content: You alredy know this I'm sure.Commoning blocks are ubiquitous. eg Wagohttps://uk.rs-online.com/web/c/connectors/terminal-blocks/distribution-blocks/See the BPX catalog.

author: openyk
author_rank: Contributor
timestamp: March 10, 2024, 08:38:06 am
content: Quote from: Terry Bites on March 09, 2024, 09:28:40 amYep. Wago lever-action common blocks are great for non-moving light-duty assemblies.They came out with inline splicing connectors a few years back too.https://www.wago.com/global/installation-terminal-blocks-and-connectors/inline-splicing-connector-with-levers/p/221-2401Ideal has some lever-action common blocks too:https://www.idealind.com/us/en/shop/in-surer-lever-wire-connector-3-port.htmlI should have specified that my application is subject to shock/vibration, so I'm looking for a more robust branching connector family.
Brand name supplier of white blinking leds? - Page 1
Forum section: electronics / projects

author: poorchava
author_rank: Super Contributor
timestamp: December 11, 2013, 10:32:27 am
content: Do you know of any good company who manufactures high brightness white LEDs that are self-pulsating (=some IC integrated within LED)? I know that Kingbright has some, but only red, green and yellow.I know that such LEDs can be found on ebay for cheap, but I need them to be from a reputable manufacturer (or at least not from no-name garage-fab in china).I'm looking for about 4000 mcd luminous intensity, give or take.Any hints?
Breadboard dimensions - Page 1
Forum section: electronics / projects

author: Boky
author_rank: Newbie
timestamp: August 30, 2014, 01:39:59 pm
content: Hello everyoneI am designing breadboard power supply and need little help.There are few different breadboard standards on the market and they all have different distances between power rails, so if I place bottom pins on PCB for one type of breadboards, power supply will not fit on others.Then I decided to simple left place for more headers to be placed on PCB with different distances between them so that power supply gets more flexibility and thus could be used on more breadboards with different dimensions.Since I have only one type of breadboard I need to get more info about other breadboards but there is no exact dimensions between power rails on the internet or datasheets so could you please fellow designers help me with this and measure distance between power rails of your breadboards?

author: andtfoot
author_rank: Unknown
timestamp: August 30, 2014, 02:12:45 pm
content: Could you not have the power go onto the parallel tracks on one side (between blue and red lines), and the leave the user to bridge across to the other side if needed?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 30, 2014, 05:35:56 pm
content: 1.70" (45.72 mm)All pins are on 0.1" grid and the gaps are 0.3" between centers.You could also measure from the picture, given the pitch is 0.1".Tim

author: IanB
author_rank: Super Contributor
timestamp: August 30, 2014, 05:54:28 pm
content: On my sample (looks just like the picture) I have have 1.67".

author: liquibyte
author_rank: Frequent Contributor
timestamp: August 30, 2014, 06:55:59 pm
content: I find it so odd that people have to ask exactly the same question on multiple forums. I answered over at e-lab but here you go again.Twin Industries 42.5 mm (1.67322835 in). The spacing is probably never going to be exact because the power rails and the breadboard aren't one solid piece so the gaps could be off by as much as 0.5 mm per side I imagine.

author: Boky
author_rank: Newbie
timestamp: September 11, 2014, 09:14:26 am
content: Thank you everyone

author: Boky
author_rank: Newbie
timestamp: September 11, 2014, 09:14:50 am
content: Quote from: liquibyte on August 30, 2014, 06:55:59 pmThank you once more in that case
Breadboard Jumper Wire Red & Black - Page 1
Forum section: electronics / projects

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 16, 2019, 04:27:27 pm
content: Does anyone know where to get a load of jumper wires (male-to-male) that are only red and only black?I have loads of colours but 90% of the time I'm in a "positive/negative" situation where these two colours are best.I've seen individual ones (20p each) but, obviously, want them at a sensible price.Cheers.

author: tooki
author_rank: Super Contributor
timestamp: August 16, 2019, 04:48:15 pm
content: eBay. I've seen bundles of single color/length before.

author: fourfathom
author_rank: Super Contributor
timestamp: August 16, 2019, 04:48:50 pm
content: I bought rolls of red and black-insulated #22 solid wire for just this purpose. I cut the wires to size, and when I'm done I throw them in a little box for later use.

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 17, 2019, 02:23:57 pm
content: Cheers but when you push them into the breadboard doesn't the insulation just move and cover the end?The ones I have now have "proper" termination.

author: Shock
author_rank: Super Contributor
timestamp: August 17, 2019, 02:37:34 pm
content: Quote from: PerranOak on August 17, 2019, 02:23:57 pmWon't do that with a bend in it or if you pinch while inserting. If you were making a ton of them you could always crimp your own wires.

author: fourfathom
author_rank: Super Contributor
timestamp: August 17, 2019, 04:36:35 pm
content: Quote from: PerranOak on August 17, 2019, 02:23:57 pmIt's just a matter of technique.

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 17, 2019, 05:19:35 pm
content: Crimp?

author: Shock
author_rank: Super Contributor
timestamp: August 17, 2019, 05:47:43 pm
content: Quote from: PerranOak on August 17, 2019, 05:19:35 pmUse a crimping tool to attach connectors.

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 18, 2019, 03:09:16 pm
content: Ah, interesting, cheers.
breadboard push button - Page 1
Forum section: electronics / projects

author: FrankBuss
author_rank: Unknown
timestamp: May 08, 2019, 09:24:17 am
content: A simple PCB which makes it easier to use a button on breadboards:KiCad design files arehere, and you can buy the buttonhere. And Isell it at Tindieas well.Not as professional, but still usable, with pin headers only:Seeherehow to build it.
breadboard with holes in it - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: December 22, 2024, 07:15:38 am
content: sometimes I don't want to trim the leads of the parts but I want to use a breadboard.is there a breadboard with holes in it so you can push down parts so you just get a bunch of stubs. it would stand on posts

author: ebastler
author_rank: Super Contributor
timestamp: December 22, 2024, 07:35:50 am
content: Aren't the typical n*(5+5) pin plastic breadboard modulesallopen at the bottom, until the manufacturer mounts them on a baseplate or sticks on some padded adhesive tape?

author: Ian.M
author_rank: Super Contributor
timestamp: December 22, 2024, 07:59:15 am
content: No, because the contact spring strips have closed bottoms. Without the tape/foam, a too long component lead can push the contact strip out of its slot.

author: ebastler
author_rank: Super Contributor
timestamp: December 22, 2024, 08:09:09 am
content: Duh, you are right of course. It's been too long since I took a few of these apart to build somebreadboard watches.

author: coppercone2
author_rank: Super Contributor
timestamp: December 22, 2024, 08:22:44 am
content: I have seen shitty powerstrips built in a way that could work
Break my bot - Page 1
Forum section: electronics / projects

author: mlugo2
author_rank: Contributor
timestamp: February 13, 2018, 08:14:51 pm
content: I need help testing my Facebook bot,Interpretron.https://www.facebook.com/Interpretron/It's basically a Lips interpreter attached to a bot, it can only do simple arithmetic commands like:* 2 3+ 4 3/ 54 (* 34 2)If you want to help me break it I'll need your facebook username to add you as a tester.Thanks!
Break-Out-Box for a Garrett Metal Detector - Page 1
Forum section: electronics / projects

author: S185149
author_rank: Contributor
timestamp: October 13, 2017, 05:03:44 am
content: I would like to build a BOB so I can probe the signal and sense coil of a Garrett AT Pro. I've read that the connectors are propriatery to Garrett so I will not be able to buy one. I measured the pins and they are 1mm in diameter and about 6.5 mm long. Any suggestions for what pins and sockets will work to rig up a connection?Thanks,S18

author: JoeO
author_rank: Frequent Contributor
timestamp: October 13, 2017, 01:54:02 pm
content: A picture including a ruler for scale would go a long way toward answering your question.

author: S185149
author_rank: Contributor
timestamp: October 14, 2017, 01:30:40 am
content: Here are pictures of the funky Garrett connector. Any suggestions as to what pins and sockets may work will be appreciated.Thanks,
breakdown of signal generator distortion by bandwidth (audio to microwave) - Page 1
Forum section: electronics / projects

author: CopperCone
author_rank: Super Contributor
timestamp: July 01, 2017, 02:23:33 am
content: How spectrally pure can a signal be generated in different bands?I know audio can be very pure (i.e. the nearest harmonic is <160dB down with real nice oscillators, like using linear-optical feedback)How does it go up?I am particularly interested in the microwave band.. like1-2 GHz2-4 GHz4-8 GHz8-12 GHz12-18 GHz18-26.5 GHzbut the other bands are interesting too.. I don't know how to call them.20KHz-190KHz ( biological ultrasonicsonic)190-10MHz (high ultrasonic)10-100MHz ()100-300MHz ()300-1000MHz ()How pure can microwave generators get?
Breaking into an existing I2C bus for a 12V lighting remote control - Page 1
Forum section: electronics / projects

author: badotter
author_rank: Newbie
timestamp: October 14, 2020, 07:10:04 pm
content: Hey folks, not sure if this is even possible or not, but it seems like it should be.The situation: we have 12V LED lights which come with remote controls to change color, brightness, etc.The goal: we would like to attach a small controller, possibly a pi zero or maybe something simpler, which would be on our local network and able to receive instructions from our phone app. This controller would then send instructions on the I2C bus between the sensors on the front of the remote and the controller chip which talks to a radio modem. The intent is to mimic the information coming from the sensors and get the chip to pass on the relevant commands to the lights.Progress so far: I have a Raspberry Pi 3 Model B with the I2C pins attached to the pins on the remote, and to a logic analyzer connected to PulseView. I can read the data flying around on the remote when I touch the sensors. I can write similar data from my pi. I cannot connect to the chip from the pi.The holdup at the moment is that when I attempt to write data to the I2C bus, I get a Remote I/O Error, meaning I am not recognizing the device with which I am attempting to communicate.What I just realized this morning, however, after noticing the slight detail of the Read bit being set on the observed communications, is that I've been picturing this whole situation all wrong. Because the sensors are SLAVES on this circuit, and the controlling chip is the master, which means it is READING data from the sensors, whereas I have been trying to _write_ data from my Pi.So, clearly, the trick is I need this controller to ask me for data so that I can respond to it, not try to initiate a conversation on my own. There must be a signal being sent whenever anyone touches any part of the sensors, which triggers the controller to send a request to address 0x53, and read back the current condition of the sensors.However, that's about as far as I have gotten. If anybody stumbles by who has been down these roads and has advice for me I would be all ears!
Breakouts for 0.4mm "mezzanine" connectors? - Page 1
Forum section: electronics / projects

author: Renate
author_rank: Super Contributor
timestamp: August 30, 2021, 01:57:21 pm
content: I've been running into these tiny connectors recently.I believe that they were originally designed for stacking hard PCBs.Nowadays I see them more often as a female connector on a hard PCB and a male connector at the end of a flexible PCB.I've seen barely a few hard PCB breakouts with female connectors.I've never seen a FPC with a male connector either broken out on the FPC itself or with a hard PCB on a tail.It would be really handy to have male connector - FPC - solid PCB - test points/jumper/bridges - female connector.I don't think that you can mate a smaller male with a larger female without cutting some plastic.What are the pin counts that people often run into?I've got a nice salvaged OLED display that I could reuse if I had a 26 pin female breakout.I guess that I could bite the bullet and sit down with my 30 AWG wire, there's not too many connections.I need a smaller male breakout (I haven't counted pins) for a power connector on an Android.I'm really looking for one-off, not manufacturing.I looked at JLCPCB and I don't see any of these connectors.Any suggestions?
Breakthrough in Underwater WiFi (not nano/quantum tech) - Page 1
Forum section: electronics / projects

author: ladytct
author_rank: Newbie
timestamp: September 05, 2020, 07:51:31 am
content: Sorry for the clickbait title! I registered an account (been a fan of Dave's busted videos) here just to share this excellent news to fellow divers:Underwater WiFi aka Aqua-Fi!!https://spectrum.ieee.org/tech-talk/telecom/internet/researchers-lasers-bring-internet-underwaterWe can finally take underwater selfies and post them on Instagram during deco and surface interval, subject to your ability to hover at depth of 5m +/- 10 mm, head pointing 3 degrees true north +/- 0.1 degree, less the laser misaligns and fires quantum goodness into your dive buddy's eyes.Seriously though, how this "invention" ended up on IEEE Spectrum is beyond me.

author: MicroBiggerThanMM
author_rank: Contributor
timestamp: September 05, 2020, 09:26:49 am
content: Actually, it's not unfeasible to be aligned to the receiver. From controls, it all has to do with the servo loop bandwidth. Using a camera chip and a laser, your sensor simply needs to sample the beam position within a millisecond and adjust piezoelectric or direct drive voice coil actuators to realign the beam to the center of the frame. Makes sense why they're (and who is) excited about this. The Navy would love to have high bandwidth wireless communication underwater while they're trying to scuba weld nuclear underwater basket mills. Additionally, this would find a lot of use in the depressurization chambers so the divers can stream Netflix as they try to avoid the bends.
Bridge amplifier circuit/Complementary push-pull amplifier(class AB input) - Page 1
Forum section: electronics / projects

author: hung211203
author_rank: Newbie
timestamp: April 15, 2023, 10:03:08 am
content: Hi guys i'm working on a project involving the bridge amplifier using class AB input(this is what its called at my place) and im struggling to figure out which circuit would be the correct one. On the web, i searched it but it keeps showing me the circuit but using ICs instead of transistors, and it's really difficult to solve the IC with electronics math. Also i found a limited sourse showing that i need to use 2 pairs of transistors with a pair consists of a NPN and a PNP; i think this is only the input or something im not sure because i have another document but its showing the OTL amplifier but also uses 4 transistors with output power of 60W and im trying to design a bridge typed one with 80W output power.Do you have any useful video links or books i can have the electronics solution to understand the circuit and to design one by myself?Thank you for reading this. Also i wil send a png file of the OTL amplifier below, i don't know if its relevant to my bridge type.I will mostly check my messages in e-mail so if i dont reply to you soon in here then i'm sorry. Have a great day!

author: Kokoriantz
author_rank: Frequent Contributor
timestamp: April 15, 2023, 02:08:03 pm
content: You need two of this amp to bridge. The loudspeaker then is bridged between the two outputs without the Cc capacitor. The input stage of one can be used for both making it as phase splitter with collector and unbypassed emitter resistors equal and feed the second amp with a capacitor from the emitter.

author: Benta
author_rank: Super Contributor
timestamp: April 15, 2023, 09:03:20 pm
content: "Class AB" has nothing to do with the input.The Class describes the quiescent DC current in the output stage.Class A: full quiescent current equal to the maximum output current. Very inefficient, but will heat your apartment nicely.Class B: minimum quiescent current, normally a few tens of mA to keep the power transistors operating linearly. Efficient, but prone to distortion.Class AB: somewhere in between, there's no precise definition.
Bridge Rectifier as Load for a SSR Circuit - Page 1
Forum section: electronics / projects

author: XaviPacheco
author_rank: Regular Contributor
timestamp: August 03, 2018, 04:37:35 am
content: Somehow, I wanted to control the power to a bridge rectifier. I had two ideas in my mind:1- Using a PCB mounted power relay driven by a transistor (is isolation maintained?)2- Using a SSR, i.e, a power triac driven by a optotriac as shown belowIn both cases, I would have to place a NTC thermistor to limit the inrush.Now, the idea I chose was the SSR, no tested yet. But someone told me:Zero crossing will work for the first 1/4 cycle, but thena) There will be no current flow to the "zero-volt switch" IC for it to know when the zero-cross happens, because "2200uF" is charged to 170V & all bridge diodes are reverse biased.b) Even if a firing pulse is given to triac @ zero-cross, it will not latch-on, because the available current is below "hold-on" current for TriacI would like to hear your viewpoints.
Bridge Rectifier over-voltage - Page 1
Forum section: electronics / projects

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 08, 2022, 02:43:52 am
content: G'day mates!I am wondering if you could tell me why this KBU1010 Bridge Rectifier has an output of 342V DC (in circuit (no load)) with an input of 120v AC ?The AC measured at the AC legs is exactly 120v AC. But the DC output is far greater than expected. In fact, almost exactly double the expected value.I was expecting 121v * 1.41 = ~ 169.2v DCDo I need to remove it from the circuit to measure these voltages?Thanks

author: bdunham7
author_rank: Super Contributor
timestamp: October 08, 2022, 02:53:07 am
content: Does your PSU have a voltage selection switch?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 08, 2022, 04:13:03 am
content: The explanation for the above comment being:If it's made for 120V use only, it may be hard-wired this way, maybe with a jumper rather than a switch.Tim

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 08, 2022, 12:55:39 pm
content: Hello,This unit only accepts 110v - 120vSchematic attached below

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 08, 2022, 12:59:49 pm
content: Thank you sir.I'll re-examine the PCB and look for such a jumper or hard wiring.

author: bdunham7
author_rank: Super Contributor
timestamp: October 08, 2022, 01:21:32 pm
content: Can you zoom out on that schematic? It might be obvious if we could see the whole thing.

author: Vovk_Z
author_rank: Super Contributor
timestamp: October 08, 2022, 01:36:10 pm
content: It may have an input auto-range technology too.

author: David Hess
author_rank: Super Contributor
timestamp: October 09, 2022, 06:56:05 pm
content: It is configured as a voltage double to produce 340 volts DC from 120 volts AC. This way it can support both 120 volt AC and 240 volt AC inputs by disabling the voltage doubling function.

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: October 10, 2022, 01:59:28 am
content: https://www.industrial-electronics.com/re_elec-exp-hndbk_doublers.html
Bridge rectifier with selectable output polarity - Page 1
Forum section: electronics / projects

author: hkBattousai
author_rank: Regular Contributor
timestamp: May 25, 2014, 03:02:29 pm
content: I need a bridge rectifier block whose polarity can be chosen by a control signal.I came up with the following circuit.I would like to know if there is an alternative method for this.

author: dannyf
author_rank: Super Contributor
timestamp: May 25, 2014, 03:20:18 pm
content: An H-bridge works. Save one set of rectifiers.

author: hkBattousai
author_rank: Regular Contributor
timestamp: May 25, 2014, 03:41:35 pm
content: Quote from: dannyf on May 25, 2014, 03:20:18 pmYou mean this, right?Brilliant idea. Thank you a lot!
bridge rectifier - Page 1
Forum section: electronics / projects

author: nimit393@gmail.com
author_rank: Contributor
timestamp: December 07, 2013, 06:16:51 pm
content: i am further connecting the output to igbt to control power through the resistorbut the rectifier is behaving in the below shown manner.even tested it on actual hardware but it gives only alternate half cycles.pls help

author: minime72706
author_rank: Frequent Contributor
timestamp: December 07, 2013, 06:29:23 pm
content: Why are you only connected to one side of the bridge rectifier's pulsating DC output? The other is floating. You'd at least need a node attached to it letting the simulator know it is node 0 or ground or whatever.

author: nimit393@gmail.com
author_rank: Contributor
timestamp: December 07, 2013, 06:42:40 pm
content: i connected it to ground alsooutput of proteus is anyways not getting affected