hybridfree/eevblog-posts huggingface dataset:
I'm looking for optical sensors - please suggest something. - Page 1
Forum section: electronics / beginners

author: NegativeONE
author_rank: Contributor
timestamp: January 11, 2015, 03:10:37 pm
content: I'm looking for two types of optical sensors for my project, any suggestion will be appreciated:1.Analog, optical proximity sensor to measure range on distance from about 1-3 cm up to 30 cm, even 50cm - something likeSharp GP2Y0A41SK0Fbut much smaller.2. Laser navigation sensor, which have capability of processing speed at least 2 meters per second.Chip + lens. Something likeADNS-9500orADNS-9800, those will be perfect, but there is a problem to buy them - I need 2-3 units.Any suggestions for model and the manufacturer, and store / distributor where I can acquire such sensors in small quantities?
I'm New Here and I was wondering if what I just got for free is any good? - Page 1
Forum section: electronics / beginners

author: ApplePi
author_rank: Contributor
timestamp: August 06, 2013, 09:42:04 pm
content: I got a Techtronix 466 Storage Oscilloscope, HP / Agilent 811A (from what I saw online) Signal Generator, and a Topward Electric TFC-1207 I was wondering if they were a good start for a beginner looking to get into electronics? I tested the Oscilloscope with the Sig Gen and it seems to be working fine even though the UNCAL light is on.

author: c4757p
author_rank: Super Contributor
timestamp: August 06, 2013, 09:48:34 pm
content: Definitely decent. The "uncal" light on the 466 probably (though I haven't used that particular model) just means one of the vernier controls is turned. Turn it back into the detent and the light should shut off. It's a 100 MHz scope, definitely decent for a beginner, plus you get storage (analogstorage, though).I think you're missing a digit from the signal generator model, but any of the ones that it could possibly be seem good.The TFC-1207 is a frequency counter, right? Those are always nice to have.

author: ApplePi
author_rank: Contributor
timestamp: August 06, 2013, 10:04:23 pm
content: Ah yeah my bad eyes were being bad it was an HP 8111A and the Frequency counter has 1 Ghz response apparently, I can't find much about it online

author: c4757p
author_rank: Super Contributor
timestamp: August 06, 2013, 10:08:38 pm
content: Looks like quite a decent signal generator. Not a bad counter either. I found the manual for it, I'll see if I can find it again.Right here.

author: ApplePi
author_rank: Contributor
timestamp: August 06, 2013, 10:37:24 pm
content: Okay coolieo, is it worth getting them Caled? Last cal was due in 2005

author: c4757p
author_rank: Super Contributor
timestamp: August 06, 2013, 10:38:59 pm
content: No.

author: Stonent
author_rank: Super Contributor
timestamp: August 08, 2013, 02:55:50 pm
content: Anything that you get for free that doesn't require antibiotics is usually a good thing.

author: ApplePi
author_rank: Contributor
timestamp: August 08, 2013, 04:40:04 pm
content: Is there a good way to clean them up and get rid of the smell? They smell like mildew and have a yellowing to everything.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: August 08, 2013, 06:47:04 pm
content: Quote from: ApplePi on August 08, 2013, 04:40:04 pmFirst thing is to try a melamine foam (Mr. Clean magic eraser). I'm amazed at how well those damn things clean. After that, check out some restorations done by Robenz. The man is a restoration master (as well as a master machinist IIRC, really)

author: c4757p
author_rank: Super Contributor
timestamp: August 08, 2013, 06:56:44 pm
content: Don't check out his restorations if you're a perfectionist, it'll just make you sad that you can't do as well...
I'm thinking about getting my first o-scope. - Page 1
Forum section: electronics / beginners

author: Refrigerator
author_rank: Super Contributor
timestamp: April 30, 2015, 03:46:42 pm
content: So the title basically says most of it.I would really like an o-scope but i don't want to spend big bucks ( i'll be saving up for the DS1054Z in the meantime ).I mostly do audio stuff, just checking for distortion and such, occasionally some other stuff like joule thieves and such.People say I should get an analog scope and not any of those µC jobs, but here where i live o-scopes are old and expensive and shipping from elsewhere would be too expensive, also reliability is in question too. I've considered starting out with the DSO138 ( for ~20 euro ), which would be decent for my use.But i don't know, maybe i should ask around for donations.Anyways, thanks for your replies.

author: kakureru
author_rank: Contributor
timestamp: April 30, 2015, 09:15:00 pm
content: the 1054z is a good call. I got it for the community around it. (with available mods and such)So unless something reasonable crosses your path that is dirt cheap....

author: Lightages
author_rank: Unknown
timestamp: April 30, 2015, 10:59:06 pm
content: That DSO 138 is a waste of money, but at least it is a small waste of money.Use that and you will be happy to save for the DS1054Z

author: LektroiD
author_rank: Frequent Contributor
timestamp: May 01, 2015, 02:30:52 pm
content: The DSO138 is a fun project to build, took me about an hour in total, and if you don't already have a scope, it would prove to be useful (any scope is better than no scope at all).I also have a 1054z and a few analogues. To be honest, the analogues are much quicker and easier to use for monitoring waveforms and most audio stuff (X-Y mode is a lot nicer on analogue too), but for the more accurate stuff such as oscillator calibration, the Rigol is invaluable.I'd recommend looking around for an old analogue scope, you can pick them up really cheap on evilBay. most of the cost will be in the shipping, so look around for something close by which you can collect in person.

author: Sigmoid
author_rank: Frequent Contributor
timestamp: May 01, 2015, 03:01:54 pm
content: I got my 1052E used, for $150 before the 1054Z came out. Now that the Z is out, I guess you might be able to get one even cheaper.If you want to go as cheap as possible, this is my suggestion, as even though the Z is obviously superior (for 3 times the price I paid), so far I've never felt that the 1052E was inadequate, especially with the 100MHz hack.

author: Refrigerator
author_rank: Super Contributor
timestamp: May 01, 2015, 03:06:35 pm
content: Thanks for the replies. My dad mentioned that he has a friend who has quite some test gear ( scopes, analyzers ) and he said he would talk to him.
I've always wondered, why do these chips have extra bits at the corners? - Page 1
Forum section: electronics / beginners

author: XOIIO
author_rank: Super Contributor
timestamp: April 18, 2014, 07:44:02 pm
content: I was watching a teardown dave was going and saw this chip and it reminded me, I've always wondered why some chips have the extra bits sticking out of the corners while most do. Is it perhaps so that they can sell the sockets for them as well to make more money? That's the only thing I can think of, though those style chips don't really use sockets.

author: w2aew
author_rank: Super Contributor
timestamp: April 18, 2014, 07:52:22 pm
content: Quote from: XOIIO on April 18, 2014, 07:44:02 pmPersonally, I think it is to provide protection for the leads when they are in the carriers or tape, so that the leads aren't bumping into the edges of the cavity they're sitting in and possible get bent. The extended corners keep the leads from touching the side of the carrier.

author: XOIIO
author_rank: Super Contributor
timestamp: April 18, 2014, 07:55:34 pm
content: Quote from: w2aew on April 18, 2014, 07:52:22 pmAh, that does make more sense, especially since it is more common on finer pitch IC'sedit: also wondering if there is a specific term for this.

author: mwilson
author_rank: Contributor
timestamp: April 18, 2014, 08:43:11 pm
content: Quote from: XOIIO on April 18, 2014, 07:55:34 pmLooks like there's a Wikipedia article on quad flat packages (http://en.wikipedia.org/wiki/Quad_Flat_Package) that mentions this. Based on that I'd call those extra bits "bumpers."

author: w2aew
author_rank: Super Contributor
timestamp: April 18, 2014, 08:44:40 pm
content: Quote from: mwilson on April 18, 2014, 08:43:11 pmQuoting from that wiki page: " A clear variation is Bumpered Quad Flat Package with extensions at the four corners to protect the leads against mechanical damage before the unit is soldered."

author: XOIIO
author_rank: Super Contributor
timestamp: April 18, 2014, 08:50:02 pm
content: Alright so I guess bumpered is the term, cool.

author: Shock
author_rank: Super Contributor
timestamp: April 18, 2014, 08:51:01 pm
content: Also you can't socket mount it.You might not be able to mount a logic debugging clip as easily on it.Without modifications of course.

author: XOIIO
author_rank: Super Contributor
timestamp: April 18, 2014, 08:57:21 pm
content: Quote from: Shock on April 18, 2014, 08:51:01 pmYeah, the socket idea basically came from thinking that maybe it was used on older chips that were socketed so that the company could sell sockets as well and it just stuck around as newer chips were made.

author: tszaboo
author_rank: Super Contributor
timestamp: April 19, 2014, 02:29:49 pm
content: Quote from: XOIIO on April 18, 2014, 08:57:21 pmThe chip manufacturer/packager/designer usually never sells sockets. Have you seen any TI, or Analog Devices branded socket?

author: XOIIO
author_rank: Super Contributor
timestamp: April 19, 2014, 03:37:55 pm
content: Quote from: NANDBlog on April 19, 2014, 02:29:49 pmI've never really looked at socket brands before lol.
IAR; different code debug & release size; queries - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: December 08, 2014, 08:23:38 am
content: 1. I have made code in IAR which I have attached.2. I have made same debug & release optimization setting i.e High, Speed, No size constraint.Surprisingly code generated in both are different even if optimization settings are same even if there is no additional code in debug or release.3. Code is just:Code:#include "stm8s.h"int main( void ){return 0;}4. Size in debug :read only code memory = 106 bytesread only data memory = 128 byteread write data memory = 256 bytes5. Size in release:read only code memory = 63 bytesread only data memory = 128 byteread write data memory = 256 bytesQuestions:1. Why different code size?2. I didn't find any map file generated?3. Is there not any zero initialized data in memory?All vars declared go to read write memory?e.g if I decalre uint8_t var; it goes to read write memory.Even if I don't assign any value to it.4. Is flash & ram size are below:flash size = read only code memory+ read only data memory+read write data memoryram size = read write data memory

author: coppice
author_rank: Super Contributor
timestamp: December 08, 2014, 08:44:57 am
content: Is that size difference because different libraries are being linked in? It depends on the particular MCU, but for many IAR has to link in a library with a couple of debug related routines when you build for debugging.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 08, 2014, 09:51:59 am
content: Look at the disassembly output to see what it's doing.If it's not generating a map file, there will be a linker option to enable it.Somewhere there will be all the settings for the debug & release configs - looking at what these settings are will probably tell you what the differences are.
IAR error: failed to initialize device - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: April 04, 2015, 08:14:33 am
content: 1. I am using MSP-EXP430G2 with MSO430G2553 on it.2. While debugging I get below error:Emulator: fatal error : failed to reinitializeSession aborted3. IAR version: 6.20.14. On board all the jumpers: test,rst,rxd,txd & vcc are connected.I have checked voltage on VDD pin, its : 3.56VIn PC->Device Manager-, com3 is successfully connected.5. After failures, I have also tried downloaded "msp430.dll_developer_package_rev_3.04.003.004" & replaced "HIL.dll" & "MSP430.dll" files in IAR/430/bin directory also.6. I have seen that several people had similar issues.7. I have selecetd project options->FET debugger-> SPI-BY interface. But still same error.
IAR view flash & ram size? - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: December 17, 2019, 06:26:34 am
content: Which setting to enable in IAR to view how mch program and data memory is occupied? My code builds with zero error & zero warning. Earlier it used to Tools->Options->Messages->Enable All.Now it dont show program/data size upon building.

author: MosherIV
author_rank: Super Contributor
timestamp: December 17, 2019, 01:41:44 pm
content: Look in the linker output file. The linker should generate a link map and tell you how much ROM and Init vars in RAM uses.

author: coppice
author_rank: Super Contributor
timestamp: December 17, 2019, 01:54:04 pm
content: The linker file has the information you want. The annoying part is that, unless they've improved things recently, its not in a nice tidy summary at the end, where it would be easy to locate and scan.
iBook G3 GPU rework/reflow with hot air - Page 1
Forum section: electronics / beginners

author: nashyboyslim
author_rank: Newbie
timestamp: July 25, 2012, 09:53:32 am
content: Hello,Not sure if I'm posting this in right place but hey ... basically I'm hoping Dave has created a tutorial on how to reflow/rework the GPU on the logic board of an iBook G3 laptop using hot air ... or which ever is the best easiest option - and if you haven't Dave could/would you do one.Many thanx in advanceChris. ( Newbie )

author: kripton2035
author_rank: Super Contributor
timestamp: July 25, 2012, 10:21:52 am
content: I've done some before, it doesnt work everytime... but it may work sometimes...and today, repairing an ibook g3 is not worth it ...

author: Rerouter
author_rank: Super Contributor
timestamp: July 25, 2012, 10:30:01 am
content: while i have never myself used one, i believe it would involve masking off the other components so as not to effect them, then go over it using temperatures suggested in the few repair stories,

author: amyk
author_rank: Super Contributor
timestamp: July 25, 2012, 10:37:40 am
content: Alternative method:http://www.geektechnique.org/projectlab/726/diy-obsolete-ibook-logic-board-repair.html

author: poorchava
author_rank: Super Contributor
timestamp: July 26, 2012, 11:26:54 pm
content: Some people used to reflow PC graphic cards in kitchen oven

author: DaveW
author_rank: Frequent Contributor
timestamp: July 27, 2012, 07:31:23 am
content: I've done a few PS3 boards, which looks like a similar problem. It's best to first mask off the components around whatever you're reflowing, kapton tape works nicely as it's highly heat resistant. Try and keep the static down when you do this though. Then, as it's a multilayer board with a lot of copper planes, it's easiest to take the whole board to a little under the solder reflow temperature, say 180 degrees C or so; being careful to make sure any plastic parts don't melt! Doing this with a toaster oven or kitchen oven is normally pretty straightforward, but the temperature readings on these can be way out, use a thermocouple or similar to read the temperature!You can then take the board out and use a hot air gun to heat up the part that needs reflowing. The cheap hot air soldering tools that come up on here frequently work well for this. You can take the part up to the full reflow temperature and it should seat back down again.Generally, you'll then have one of three things happen. It'll either not work and never work again, which means you've heated it up too much. Or it'll work for a while, and then break again. This means you've got to do the same process again, but being a bit more aggressive with the heat in the final stage. Or it'll be fixed!

author: nashyboyslim
author_rank: Newbie
timestamp: October 07, 2012, 07:29:03 pm
content: Hi Guys,Many thanx for all of your replies, I will try all of your suggestions .. and report back if I have any success.Cheers,nashyboyslim.
IC blown on System Control board in Panasonic AG-500 - Page 1
Forum section: electronics / beginners

author: Arkwright
author_rank: Newbie
timestamp: February 05, 2023, 06:35:35 am
content: Good dayI am new to this forum and have a query regarding an issue with my Panasonic AG-500 TV/VCR unit. I found that the BA6248 IC was blown on the System Control board of the VCR, and this in turn blew the 1A fuse on the Sub Main C. B. A. board. I replaced both the IC and fuse, and the VCR appeared to work again, however, the Fast Forward and Rewind functions did not work when selected. Playback and Eject were fine, and then as I reinserted the cassette, it jammed slightly during the initial pulling in. Instead of pushing the tape back out, the machine remained in that position and the same IC(BA6248) and 1A fuse blew again. So I replaced it again, and now the machine just wants to go straight into Playback mode even if no cassette is inserted. I used a dummy tape for this so that no damage would occur to my other tapes, and as I tried to get the machine to eject, it carried on playing and then shut down which then caused the same IC and fuse to blow for the third time. At this point, I'm stuck as to where to examine for other issues as there are a few other IC's and other components which don't appear to be at fault. Any assistance would be greatly appreciated. I've attached images of the schematics from the service manual.Kind regardsStephen

author: Arkwright
author_rank: Newbie
timestamp: February 05, 2023, 06:40:19 am
content: Here are the Sub System C. B. A. schematics.

author: m k
author_rank: Super Contributor
timestamp: February 10, 2023, 05:27:53 pm
content: Can't locate the chip.Google offers a 3-phase motor driver.Could be a bearing then.

author: Arkwright
author_rank: Newbie
timestamp: February 12, 2023, 07:57:25 am
content: Thank you for your response. I will check the motors that are driven by this component.

author: wraper
author_rank: Unknown
timestamp: February 12, 2023, 08:03:50 am
content: You did not attach a schematic of Servo section.

author: wraper
author_rank: Unknown
timestamp: February 12, 2023, 08:19:55 am
content: Is BA6248 IC6003 which is M54649L on schematic?

author: Arkwright
author_rank: Newbie
timestamp: February 13, 2023, 06:24:07 am
content: Yes, that is correct. According to the list of parts, BA6248 is actually the recommended IC to use.
ic config - Page 1
Forum section: electronics / beginners

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 19, 2019, 09:53:59 pm
content: How do I know where pin one is on this, so I can replace. Thanks Michael

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 19, 2019, 10:18:01 pm
content: Thanks I really could tell if that was a dot or not, yeah the chip I bought is already programmed. Michael

author: james_s
author_rank: Super Contributor
timestamp: January 19, 2019, 11:06:50 pm
content: It's also marked on the PCB silkscreen, the notch indicates the end with pin 1. With the chip right side up, pin 1 is always the bottom-left corner, most of the time the text is printed right side up on the IC however I have seen pictures of a few examples where this wasn't the case. Never personally encountered one though.
IC digital output pins and voltage divider? - Page 1
Forum section: electronics / beginners

author: Apokalypz
author_rank: Newbie
timestamp: September 12, 2017, 05:47:36 am
content: This may be a stupid question, so intelligence be warned. I've just never really understood how integrated circuits like microcontrollers can drive LEDs without the drawbacks of the LEDs being in parallel. How exactly can each output pin source or sink current and not affect the other pins?My knowledge about how voltage dividers work makes me think the load on one pin would greatly affect the other pins.

author: Ice-Tea
author_rank: Super Contributor
timestamp: September 12, 2017, 06:32:48 am
content: Consider the outputs of ICs as being in parallel. A power supply rail -> some resistance -> a switch -> your LED. And in parallel for all IOs.>

author: Ian.M
author_rank: Super Contributor
timestamp: September 12, 2017, 06:49:11 am
content: In general, when driving a LED from a digital output, one should *ALWAYS* use a series resistor so the LEDs are never paralleled. The only exceptions to the need for a series resistor are when the logic supply voltage is only fractionally more than the LED Vf, and the output resistance of the logic is sufficient to limit the LED current, or special purpose chips that have a constant current output characteristic. In both cases parallel LEDs on the same output would be problematic.

author: Ice-Tea
author_rank: Super Contributor
timestamp: September 12, 2017, 06:54:36 am
content: ^|This. I didn't read your question careful enough.

author: danadak
author_rank: Super Contributor
timestamp: September 12, 2017, 10:31:44 am
content: There are two current flows one has to worry about for UPs drivingloads. The individual pin limits/capability, and the sum of all loadsaffecting the internal power rail of the UP. The latter, in most UP's,is speced, usually a total for a port or total for chip or both.Regards, Dana.
IC for two bit address match  - Page 1
Forum section: electronics / beginners

author: Back2Volts
author_rank: Unknown
timestamp: September 16, 2017, 04:24:26 pm
content: To detect match on a two bit address, other that using a 4x XOR gates chip, are there other simple options out there ?

author: Benta
author_rank: Super Contributor
timestamp: September 16, 2017, 04:47:28 pm
content: Search for "magnitude comparator". I know it's available in 4000 series CMOS, not sure about LS or HC/AC.

author: edavid
author_rank: Super Contributor
timestamp: September 16, 2017, 04:56:02 pm
content: Fixed address, jumper selectable, software selectable?Depending on the answer, you might use 74xx85, 74xx138/74xx139, 74xx151, 74xx266...

author: Back2Volts
author_rank: Unknown
timestamp: September 17, 2017, 02:30:06 am
content: Quote from: edavid on September 16, 2017, 04:56:02 pmBoring stuff. Think of four identical modules plugged into a back plane bus. Two connector pins hardwired in the back plane to set the slot address. Two bus lines to address any one of the modules. The modules have to react to match on the two pairs as being selected.From the suggestions it seems the best is still the 4x XNOR gates (or XOR for active LOW).Thanks

author: Benta
author_rank: Super Contributor
timestamp: September 17, 2017, 10:07:19 am
content: If it's just static decoding, I'd use 1/2 of a 74HC139. If you like, you can place four jumpers on the outputs, so each module can be configured to be address 0...3. Might be useful for swapping later on.

author: Back2Volts
author_rank: Unknown
timestamp: September 18, 2017, 04:31:38 pm
content: After thinking about it for a while, I am going to move the selection to a 74HC139 on the backplane and with select pins in the slot connectors. It removes one chip from the slot boards.I will still have a two pin hardwired slot address to build addresses of some I2C chips in the modules. The modules will be identical, with no need for dip switches or jumpers.Thank you all.
IC Identification Help - Page 1
Forum section: electronics / beginners

author: Lonnie Mason
author_rank: Newbie
timestamp: July 16, 2017, 06:24:06 pm
content: Hello everyoneI received a nice donation of vintage electronic components.Most of the components are from the 70s-80s I got a lot of IC's.I have been able to identify all but 6 of them.If anyone has any information about these IC's that would be awesome.Image of IC'sUnidentified IC's930962HAL16L8CN 8513 8075968 TANDY ©82SW 7494-N 7351MS16A 150?J SE IWAKIAY-3-1015D 7937

author: firehopper
author_rank: Frequent Contributor
timestamp: July 16, 2017, 06:39:17 pm
content: Quote from: PacketCrash on July 16, 2017, 06:24:06 pmthe HAL is a PAL or GAL logic chip, possibly from a tandy computer?the ay-3 is possibly a sound chip of some sort.

author: Gyro
author_rank: Super Contributor
timestamp: July 16, 2017, 06:40:57 pm
content: Google is your friend - for some of them anyway...The AY-3-1015D is a UARTThe Tandy chip is a PAL - probably programmed for some Tandy product.The 7494 is a standard TTL 4 bit shift registerThe one with 150 Ohm on it is almost certainly a resistor packThe 930 and 960 are DTL (diode-transistor) Logic chipsP.S. Welcome to the forum.

author: Lonnie Mason
author_rank: Newbie
timestamp: July 16, 2017, 06:45:46 pm
content: Thanks for the help

author: Benta
author_rank: Super Contributor
timestamp: July 16, 2017, 06:55:03 pm
content: Almost right, you got 5 out of 6.QuoteIt's actually a HAL - hard array logic, which is a mask programmed version of a PAL. Absolutely useless for anything other than the original Tandy circuit.I'm more impressed with your knowledge about the DTL parts, never seen those myself before, even after 40+ years working with semiconductors. Chapeau!
IC Identification  - Page 1
Forum section: electronics / beginners

author: Naturalizt
author_rank: Newbie
timestamp: April 01, 2018, 07:54:39 am
content: Dear All,I would like to question about an IC depicted in the attachment. What is this IC? Can someone pinout it or forward some information about it?The figure is the motherboard of an HP Deskjet 1510 printer. I heard of reflashing the EEPROM installed there. I would like to reset this in order to bring the printer to life again...thanks

author: amyk
author_rank: Super Contributor
timestamp: April 01, 2018, 06:05:09 pm
content: N25Q032A13ESC40F. Literally the first result in Google.
IC information-Need Help  - Page 1
Forum section: electronics / beginners

author: huu_tri0101
author_rank: Contributor
timestamp: April 25, 2016, 09:42:35 am
content: Hello guys,Any help is gratefull.Attachment is the number on back of IC and picture of it.The U1 is M24512-RDW6TP.Thank you a lot.

author: danadak
author_rank: Super Contributor
timestamp: April 25, 2016, 09:53:36 am
content: http://www2.st.com/content/ccc/resource/technical/document/datasheet/e0/4c/87/45/e8/bd/4f/11/CD00251873.pdf/files/CD00251873.pdf/jcr:content/translations/en.CD00251873.pdf

author: forrestc
author_rank: Unknown
timestamp: April 25, 2016, 09:56:12 am
content: Quote from: huu_tri0101 on April 25, 2016, 09:42:35 amWe're going to need a better picture, and more context to be more helpful. What is this used in? Can you get a high resolution photo?In reality, identifying a random smd IC is a long shot at best. Where I've had luck I've been able to identify the logo and likely function of the IC beforehand. Identifying the logo (what I'm guessing you mean by the 'w' in the image), is your first step.On the other hand, the other IC is one of these:http://www.mouser.com/ds/2/389/CD00251873-251997.pdf-forrest
IC output current question - datasheet - Page 1
Forum section: electronics / beginners

author: banedon
author_rank: Regular Contributor
timestamp: March 19, 2015, 07:13:49 pm
content: Hi guysI have a newbie question on reading datasheets.I'm planning to do some bread board tests with a T.I. SN74HC259N (8 bit addressable latch) and want to drive an LED on each of the Q0-7 outputs.Checking the datasheet it seems to state the following:(page 4) Continuous output current ... +/-20mA(datasheet found on this page:http://www.farnell.com/datasheets/1886232.pdf)Does this refer to a 20mAper pincurrent output maximum or is it for the entire outputs put together? I suspect the former, but would like to be sure (assuming that I'm looking at the right part of the data sheet!).Many thanks for any advice given

author: JohnnyBerg
author_rank: Frequent Contributor
timestamp: March 19, 2015, 07:26:47 pm
content: Page 4 also says: "Continuous current through VCC or GND . . . . . . . . . .. . . . . . . . . . . . . . . . . . . ±50 mA"I am not sure the output can realy drive 20mA, as page 1 says: "High-Current Inverting Outputs Drive Up To10 LSTTL Loads" and "±4-mA Output Drive at 5 V"I think the 20mA is the max output clamp current, that is something completely differentAs it is a TTL device, and you hook up the leds from the output to VCC (with series resistor), and do not exceed 4mA per LED, you should be fine.

author: banedon
author_rank: Regular Contributor
timestamp: March 19, 2015, 07:34:43 pm
content: HiThanks for answering my question.I had 2mA @ 1.9V from each line in mind (so the series resistors would be 1K5). I initially wondered about the 4mA in the main page, but then saw the other setting.Thanks again for your advice.

author: Zero999
author_rank: Super Contributor
timestamp: March 19, 2015, 08:27:43 pm
content: The absolute maximum current through each output pin is 25mA. It's not a good idea to exceed this and the outputs will certainly not give valid logic levels with this amount of current being sunk or sourced from an output. The maximum output current you can draw, whilst still outputting a valid logic level (this isn't listed on the datasheet you've linked to but is standard for 74HCx) depends on the power supply voltage, at 5V it's 4mA.http://www.nxp.com/documents/user_manual/HCT_USER_GUIDE.pdfThe absolute maximum current through the VCC and GND pins is 50mA.Irrespective of the above requirements; you need to make sure the IC doesn't overheat due to excessive power dissipation.

author: banedon
author_rank: Regular Contributor
timestamp: March 19, 2015, 09:45:20 pm
content: 2mA was more than enough. See attached pic & schematic.Thanks for your advice.
Ic pixel art - Page 1
Forum section: electronics / beginners

author: CoopedUp
author_rank: Regular Contributor
timestamp: June 15, 2019, 12:53:56 am
content: So, I have alot of eproms and other chips so I sorted out the colors and made a pixel art Mario. What's worth more the individual chips or Mario? I am planning on putting it onto a different background.

author: TheRadioGeek
author_rank: Contributor
timestamp: June 15, 2019, 02:42:06 am
content: hey that's cool! i would bet that Mario will sell on Ebay faster then the chips by them self's.

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: June 15, 2019, 07:40:28 am
content: I love it!That is a beautiful idea for using obsolete chips

author: CoopedUp
author_rank: Regular Contributor
timestamp: June 15, 2019, 05:08:16 pm
content: Thanks, I figured that I had enough of the colors to make it and I was pretty close, the coolest part to me is that the colors are from the original application stickers with the description or whatever is written on them.

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 15, 2019, 10:36:31 pm
content: Quote from: CoopedUp on June 15, 2019, 12:53:56 amSell it on EBay to the Nintendo fansStart an IC Photo Mosaic

author: Domagoj T
author_rank: Frequent Contributor
timestamp: June 16, 2019, 06:44:28 am
content: Quote from: windsmurf on June 15, 2019, 10:36:31 pmIt's nice to see a mosaic where actual photos are used to generate the bigger image.These days usually what you can see is just a bunch of images crammed without any order and then a bigger one overlaid over them. You then adjust opacity of the big one and you're done.
IC power consumption with different supply voltages - Page 1
Forum section: electronics / beginners

author: DanioIO
author_rank: Contributor
timestamp: April 12, 2015, 01:40:27 pm
content: Hi,Im trying to reduce power consumption of a microcontroller. I need to know how does the supply voltage affects the power consumption of the device. Of course i understand the ohm law but are there any things to consider which will increase the current consumption with lower supply voltage. For example would microcontroller consumption the same current at 3.3V, 2.5V and at 1.8V?

author: BradC
author_rank: Super Contributor
timestamp: April 12, 2015, 01:42:48 pm
content: Quote from: DanioIO on April 12, 2015, 01:40:27 pmThat information is usually available in the data sheet for the microcontroller you are planning to use. As is the characterization of current vs clock speed.

author: DanioIO
author_rank: Contributor
timestamp: April 12, 2015, 02:16:46 pm
content: Yes i can find that data but I am looking for something more specific which will work for all ic's. I am wondering how the supply voltage can affect a sensor board containing for example accelerometer, gyro, temperature sensor etc.

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 12, 2015, 03:27:39 pm
content: Quote from: DanioIO on April 12, 2015, 02:16:46 pmBetter go with the datasheet with every IC, they all will tell you what you need to know.Other solution, power the whole circuit and measure the current on 5V and 3.3V.One thing i can tell you, at 3.3V you should require vastly less energyAt least that is my experience...
IC Query  - Page 1
Forum section: electronics / beginners

author: yalect
author_rank: Regular Contributor
timestamp: October 03, 2019, 02:16:40 pm
content: Hi,I would like to ask you that I am looking forICintegrated circuit include Two 555 timer and How to search for such circuit by the content?Greeting

author: RoGeorge
author_rank: Super Contributor
timestamp: October 03, 2019, 02:18:24 pm
content: 556http://www.ti.com/lit/ds/symlink/se556.pdf

author: rrinker
author_rank: Super Contributor
timestamp: October 03, 2019, 07:59:30 pm
content: The usual terminology for multiple of a circuit in a single IC is "dual" or "quad", ie, dual flip-flop, dual timer, quad NOR gate.
IC recognising help - Page 1
Forum section: electronics / beginners

author: SolidFloyd
author_rank: Contributor
timestamp: December 06, 2010, 12:51:00 pm
content: Well, me, with my absolute just basic skills is trying to figure out why my old man's LCD monitor stopped working..The monitor is all black, no life at all, so I suspect the power supply... after some measuring, some googleing I now think the fault is in the inverter, wich is a full bridge inverter board, there is a total of 4 small IC's, that is connected to some high voltage transformers, the pcb around these IC's is miss coloured, may been some excessive heat going on...I think (I may be totally off here..) the IC's are some sort of powertrench mostef's, but I can't find any info about them, the number is P600 AD2T13.. I don't like to put my probes on the pins before I know what's what...Anybody know of the P600 AD2T13

author: Psi
author_rank: Super Contributor
timestamp: December 06, 2010, 09:31:11 pm
content: is that everything that is written on the IC?also check to make sure its 100% correct, sometimes the letters can be easily misread.

author: SolidFloyd
author_rank: Contributor
timestamp: December 06, 2010, 11:06:15 pm
content: jepp, 100% sure it's correct..But after some more troubleshooting, and re-soldering off some bad joints, and the change off one diode the LCD is (for)now working, meaning that these IC's most likely are good...

author: the_raptor
author_rank: Regular Contributor
timestamp: December 07, 2010, 07:27:22 am
content: Good job for making a strike against our throw away society.
IC-TTL Transistor Tester  - Page 1
Forum section: electronics / beginners

author: mrrcomp
author_rank: Contributor
timestamp: October 16, 2023, 05:00:24 am
content: HiConsidering purchasing one of these multitesters. My question is can these units test transisters etc that are soldered on the board or do we need to desolder the component to test it?RegardsMeir

author: Kim Christensen
author_rank: Super Contributor
timestamp: October 16, 2023, 05:17:08 am
content: You're not going to get consistent results trying to test components in circuit.Best to understand how the circuit works, take measurements, and then base your conclusions upon that data.
IC2 Buffer - Page 1
Forum section: electronics / beginners

author: ALAN13
author_rank: Newbie
timestamp: May 29, 2019, 08:57:41 am
content: Hi,I have an IC2 bus that need to go off board and connecting to another pcb. The length is approx 20cm. I'm planning on using a P82B96 Buffer, using twisted pairs as recommended on the data sheet. Will this help with EMI Suseptability?
ICL7106  schematics from datasheet, mains voltage and higher? - Page 1
Forum section: electronics / beginners

author: dds
author_rank: Contributor
timestamp: June 24, 2013, 02:50:05 pm
content: Okay, here is the schematicshttp://www.electroniq.net/files/other/icl7106.jpg, if I want to measure mains voltage AC, (230 V in Europe ) what steps are necessary to redesign this schematics? Voltage divider network?Thanks!

author: digsys
author_rank: Unknown
timestamp: June 24, 2013, 03:15:03 pm
content: Unless you can guarantee that the display is totally isolated from "the outside world", you should definitely use some form of isolation.The simplest would be a small AC/AC transformer ie 230VAC > 5VACIs this part of equipment? User accessible? Knowing what you are trying to achieve would help.

author: dds
author_rank: Contributor
timestamp: June 24, 2013, 03:42:01 pm
content: hi,It's an simple voltmeter.

author: mariush
author_rank: Super Contributor
timestamp: June 24, 2013, 05:16:52 pm
content: Read the datasheet, it contains all you need to know about how to set it up :http://www.intersil.com/content/dam/Intersil/documents/fn30/fn3082.pdfthe ICL7106 is in two variants, one which drives lcd segments and one which drives LED segments... be careful which one you get.The LED segment version may work with 5v but it's designed to work with 9v , or with -5v and 5v (so 10v in total) and can also run at something like 12 v (absolute maximum permitted is 15v) - it should be isolated from the rest of the system (power it from a separate power supply (transformer + rectifier+capacitors or a tiny switching power supply)The datasheet also mentions some applications notes on one of the pages, one of them is AN046 Building a Battery Operated Auto Ranging DVM with the ICL7106 :http://www.intersil.com/content/dam/Intersil/documents/an04/an046.pdfThe appnote has the schematic for autoranging from 200mV to 200v if you want take full use of the 3 1/2 digits, otherwise you could just say 250v = 250mV and use only 3 digits.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 24, 2013, 06:23:58 pm
content: Quote from: mariush on June 24, 2013, 05:16:52 pmNot really, there is an ICL7106 for LCD and an ICL7107 for LED, but still not enough difference not to be careful

author: dds
author_rank: Contributor
timestamp: June 24, 2013, 10:54:44 pm
content: Thanks guys!I've found this datasheet too,http://www.intersil.com/content/dam/Intersil/documents/fn30/fn3082.pdfwhich has a schematic (figure 21) for AC to DC converter. Now I have totally naive newbie question about this figure: How could this Op-amp (CA3140) together with 100 kilo ohm resistor survive let's say : 500 Volts AC?

author: Bored@Work
author_rank: Super Contributor
timestamp: June 24, 2013, 10:58:48 pm
content: It can't, and they don't claim it will.

author: digsys
author_rank: Unknown
timestamp: June 24, 2013, 11:00:26 pm
content: Quote from: ddsIt CAN'T :-) As I said, you HAVE to use a step-down transformer to 1/ Isolate the mains for safety 2/ obtain a safe working voltage
ICL7107SCPLZ and  HD44780 LCD display - simple voltmeter? - Page 1
Forum section: electronics / beginners

author: dds
author_rank: Contributor
timestamp: July 05, 2011, 10:53:02 am
content: Hi,I would like to build simple voltmeter with these two, but I don't know where to start. Any idea?thanks.

author: david77
author_rank: Frequent Contributor
timestamp: July 05, 2011, 12:28:08 pm
content: Well, using the 7107 and some LED displays you get a voltmeter, just look at the 7107's datasheet.The 7107 is a fully integrated 3,5 digit voltmeter, with driver circuits for 7 segment LED displays.The HD44780 LC-display is of no use together with the 7107.If you want to use a dot-matrix LCD you something that can drive the thing and something that does the A/D conversion for you. Probably some sort of microcontroller + appropriate software.
ICL8038 Signal Generator main 100uF filter Cap EXPLODED - Page 1
Forum section: electronics / beginners

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 18, 2017, 11:34:55 pm
content: I cam show the exact product latterIts a basic ebay signal genorator ICL8038

author: barry14
author_rank: Regular Contributor
timestamp: April 18, 2017, 11:55:17 pm
content: You need to provide a lot more information before anyone can even hazard a guess as to what happened. However, if the capacitor is part of your power supply, then it reasonable likely that you exceeded its voltage rating.

author: Audioguru
author_rank: Super Contributor
timestamp: April 19, 2017, 12:55:48 am
content: An electrolytic capacitor will explode if its polarity is connected backwards.
ICL8038BC what to do with it? - Page 1
Forum section: electronics / beginners

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: April 02, 2013, 08:22:27 pm
content: hello, i have been tidying my bench today and sorting out my component draws (monster task as it has a tonne of random components in that need sorting) and i came across a ICL8038BC from RS (306-314) and i noticed that it was a waveform generator.is this chip any good? if so how would i use it to make my own waveform generator?

author: mariush
author_rank: Super Contributor
timestamp: April 02, 2013, 08:40:08 pm
content: Have you thought of searching Google for the datasheet using the IC name?Here, found it between the first few results:http://www.intersil.com/content/dam/Intersil/documents/fn28/fn2864.pdfThe datasheets explains how it works and has a few circuit examples you could use.

author: SeanB
author_rank: Super Contributor
timestamp: April 03, 2013, 04:25:32 pm
content: Just remember that that IC runs pretty hot, a stick on heatsink will not go amiss.

author: Tepe
author_rank: Frequent Contributor
timestamp: April 03, 2013, 05:32:39 pm
content: Quote from: carbon dude oxide on April 02, 2013, 08:22:27 pmThe very same RS supplies the data sheet:http://docs-europe.electrocomponents.com/webdocs/0118/0900766b8011862a.pdfas well as some extra informationhttp://docs-europe.electrocomponents.com/webdocs/001b/0900766b8001b696.pdf
Icom R71E, logic board battery fail? - Page 1
Forum section: electronics / beginners

author: BarneyRubble
author_rank: Newbie
timestamp: February 26, 2021, 12:22:47 pm
content: Hi folks,,,, first pot on here, here goes!I have an Icom R71 Rx, doing crazy things. Can anyone please help by looking at this video I put on the tubeand see if it looks like the battery has failed on the logic board? I have been told so, but the few vids I have seen are showing things a little different to this, and mostly show the IC745/751 Trx too. Note the display segment brightness as well as the RF gain being weird. Anyone give me some pointers please? I note where I can get a better replacement board from, but are there other issues that can be spotted in my short clip? I can maybe add more if it helps. Please ignore the filthy external appearance, I got it like that! And that's another job........cheers'n'beers folks!
ICs & Hotplate - Page 1
Forum section: electronics / beginners

author: Memductor
author_rank: Newbie
timestamp: September 22, 2020, 09:21:51 am
content: Hello everyoneI'm somewhat new to PCB assembly and I recently had the issue that my circuit failed after connecting it to the input power (15V). The linear regulator at the input "burnt" and after some (long) troubleshooting I figured it was a solder bridge which caused a short circuit at the input of an OpAmp (at least that's what I think caused the failure).I figured that for the next PCB assembly it might be more useful to solder each part of the circuit after another and check in between if the parts that I already soldered work properly.Now the question I have is if that could be damaging to some ICs on the PCB. Say if I solder the first part of the PCB (some passives and some OpAmps), then the next one etc. would the ICs that I soldered first take damage from the hotplate (125°C) when I solder the subsequent parts of the PCB?

author: mayor
author_rank: Regular Contributor
timestamp: September 22, 2020, 10:31:01 am
content: Personally, I try to leave boards for as little time as possible on the hot plate. I wouldn't return a board multiple times as you are suggesting. Out of curiosity, what is the package for that LDO? I've not had bridges I couldn't correct with an iron on small footprints like 0402 and 48QFN at 0.5mm pitch, sometimes less.

author: Siwastaja
author_rank: Super Contributor
timestamp: September 22, 2020, 04:14:47 pm
content: No, the 125degC hotplate won't damage any components (not even most temperature-sensitive components like plastic connectors, electrolytic capacitors etc.) even if you work for dozens on hours on it. Your hotplate temperature is spot on and reduces the risk of soldering issues; also reducing thermal shock to some component types that may be sensitive to quick temperature changes (such as large MLCCs).125degC is also low enough so that bringing anything on the top of the plate surely won't cause rapid thermal cycling. It would be a different thing to repeatedly bring boards on a 300degC hotplate, for example, due to the sudden thermal shock every time.Having power applied while hot may be a problem, though, if the junction temperature is close to 125 degC, especially if there is some power dissipation in the components themselves; the circuits won't be designed foroperatingat Tambient=125 degC. Especially if the thermal design of the circuit is marginal, I would let the board cool down for a few minutes before applying power.
ICSP question - Page 1
Forum section: electronics / beginners

author: somlioy
author_rank: Regular Contributor
timestamp: December 27, 2012, 05:02:53 pm
content: Do I need some sort of protection on the output of a L7805 when powering the circuit from the ICSP header? Likely from a STK500 or AVR Dragon.If I leave pin 2 (power) unconnected on the ICSP header, and power the circuit from the L7805, will the programmer still work?

author: ChrisMH
author_rank: Contributor
timestamp: December 27, 2012, 05:07:45 pm
content: I can only answer for the PIC ICD programmer, but it is likely similar for others. The PIC ICD will not program when the chip is externally powered if it does not sense a voltage on Vdd. I think it has to do with the programmer being able to set correct levels on PGC and PGD.

author: somlioy
author_rank: Regular Contributor
timestamp: December 28, 2012, 08:01:21 pm
content: Alright. How I understand this is that the AVR Dragon dosent supply 5v to my circuit because it's only powered from USB, but the STK500 does, because it has an external supply.So how does the L7805 handle 5v input on the output, when the input is disconnected?

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: December 28, 2012, 08:56:42 pm
content: 7805s will not like having 5v on the output with 0v on the input. Some regulators are built to handle this but most are not.The solution is simple. Connect a diode between input and output so that the diode will supply ~5v to the input when external power is connected. In normal operation, the diode is reverse-biased and has no effect on the circuit.

author: somlioy
author_rank: Regular Contributor
timestamp: December 28, 2012, 09:15:11 pm
content: Great, thanks for clarification.

author: DavidJRobertson
author_rank: Regular Contributor
timestamp: January 13, 2013, 12:31:21 pm
content: Small nit-pick: if you're using a STK500 or AVR Dragon, then you're using an Atmel AVR. Atmel calls their programming interface ISP (not ICSP), short for In-System Programming.