hybridfree/eevblog-posts huggingface dataset:
Generic TSSOP-16 eagle package - Page 1
Forum section: electronics / beginners

author: belzrebuth
author_rank: Frequent Contributor
timestamp: February 21, 2024, 01:35:17 am
content: I was wondering if there is a library avalaible somewhere for a TSSOP16 package with empty pins.I haven't really bothered creating my own parts as there always something I could use in a pinch but this one seems trickier to find.

author: Foodie
author_rank: Newbie
timestamp: January 15, 2025, 12:11:01 pm
content: This thread brings back memories of when I first considered taking the PE exam. At the time, I was juggling work and personal projects and trying to find the best resources to prepare. I remember stumbling upon a mix of recommendations—textbooks, review manuals, and even free physics courses that helped clarify some of the trickier concepts in circuits and power systems.It wasn’t just about passing the exam but also gaining a deeper understanding of my field. The journey itself was eye-opening, especially the experience of working under a licensed PE. It showed me how much responsibility and precision the role entails.To anyone preparing for the exam now, I’d suggest not rushing through it. Take the time to build a strong foundation, whether through formal coursework or supplementary resources with free lectures online. They can really make a difference when you’re tackling complex problems.

author: Eagcress88
author_rank: Contributor
timestamp: January 20, 2025, 11:54:06 am
content: Quote from: Foodie on January 15, 2025, 12:11:01 pmWhat soft skills do you consider to be most crucial for a successful engineer?
Geometry Question - Page 1
Forum section: electronics / beginners

author: metrologist
author_rank: Super Contributor
timestamp: June 23, 2022, 02:09:39 pm
content: In machining and toolmaking, a very flat surface plate is used as a reference for measurement. Often a "height" gauge is used, which has a dial indicator mounted to a base. (video at end of post for reference).We have a roundish cylinder that we slide on the surface plate and under the height gauge to determine it's diameter. We repeat this measurement around its circumference and obtain the same reading at every point. We cannot say that the cylinder is round because there are shapes such as a Reuleaux triangle that foils our measurement technique. A smart machinist might suggest you need to set the cylinder into a vee block, so that there are three points of contact, two on the vees and one on the dial indicator.Is there a shape that will similarly foil the that measurement technique, and what would that shape be?This question was born from a debate about whether a 90 degree or 60 degree included angle vee block yields a more accurate reading of "out of roundness."

author: rob77
author_rank: Super Contributor
timestamp: June 23, 2022, 02:30:56 pm
content: and that's why roundness is checked against the centre of the object by rotating the object on it's axis (e.g. in a lathe) and checking with a dial indicator.

author: Terry Bites
author_rank: Super Contributor
timestamp: June 23, 2022, 03:47:34 pm
content: A messge from the old country.https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwip286K88P4AhVUSsAKHVCLBXEQFnoECA4QAQ&url=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F326597023_Measuring_the_roundness_deviation_in_the_Vblock_measurement_method%2Ffulltext%2F5b58a6be458515c4b244b888%2FMeasuring-the-roundness-deviation-in-the-Vblock-measurement-method.pdf&usg=AOvVaw1CK5N3x2KnzZKTYQQDS5DvI love this, "Studies have shown that non-asymmetrical measurement schemes are more universal."So I you dont want an error, avoid balancing your rod on balls of differing sizes.

author: metrologist
author_rank: Super Contributor
timestamp: June 23, 2022, 10:31:02 pm
content: Sometimes there are no centers.Glorious nugget of knowledge. It does indeed answer the V-block debate. I still wonder if a shape exists that would evade out of roundness using this method.
Germanium amplifier - Page 1
Forum section: electronics / beginners

author: Simon123
author_rank: Regular Contributor
timestamp: October 14, 2013, 07:25:02 pm
content: Hello!I have found this circuit on net, but now i only have AC542, could this be substitute for AC152.I can get AC543, but i was just wondering if this could do it?http://www.electronicstudio.net/schematics/aa10wgerm.jpgThanks!

author: Zero999
author_rank: Super Contributor
timestamp: October 14, 2013, 08:28:38 pm
content: Just one question: why?

author: sync
author_rank: Frequent Contributor
timestamp: October 14, 2013, 08:52:14 pm
content: The AC542 is much weaker than AC152. I don't think it's a good replacement. Better use an AC128. But AC152 are available on Ebay Germany.This amplifier will sound terrible. If you want to know how bad early transistor amps sounded then build one.

author: Simon123
author_rank: Regular Contributor
timestamp: October 14, 2013, 09:00:34 pm
content: Ok, tnx in my local shop they have a lot of germanium transistors so i dont need ebay.I built this and it doesnt sound teriblehttps://sites.google.com/site/elektronikasimon/germanium-transistor-amplifier.Why? Beacuse they are avilible-cheap and i wana try out something difrent.And when i build it, ill post video to youtube and link on this page, so everywhone can see.

author: sync
author_rank: Frequent Contributor
timestamp: October 14, 2013, 09:06:29 pm
content: Ok, we have a very different meaning of terrible sound.
germanium transistors -=- npn or pnp - Page 1
Forum section: electronics / beginners

author: Chopsticks
author_rank: Regular Contributor
timestamp: July 08, 2012, 12:11:36 pm
content: hi everyone,I've got a bunch of germanium transistors probably dating back to sometime in the 60's and they are labeled rt2307, the issue is that one of my side projects is a vintage fuzz guitar pedal and i got these transistors to try in it however i dont know if they are PNP or NPN. Nothing comes up on google and i'd lean towards them being NPN as they were cheaper and easier to manufacture back in the 60's era however im wondering how to test them to find out for sure either way without damaging them?

author: Unknown
author_rank: Unknown
timestamp: July 08, 2012, 12:20:53 pm
content: PNP should measure like two diodes from BE and BC with the cathode connected to the base. An NPN transistor should have the anode of these diodes connected to the base.

author: Rerouter
author_rank: Super Contributor
timestamp: July 08, 2012, 12:21:44 pm
content: http://talkingelectronics.com/pay/BEC-3/PNP-or-NPN.htmlhave fun

author: SeanB
author_rank: Super Contributor
timestamp: July 08, 2012, 12:36:08 pm
content: Shoot, found I have about 2 dozen AD161 Ge power transistors as well, NPN 32V 1A TO66 devices. Wonder how many still meet spec.

author: amyk
author_rank: Super Contributor
timestamp: July 08, 2012, 01:10:52 pm
content: Some DMMs have a built-in transistor test function that can determine what polarity one is, as well as its gain.

author: Unknown
author_rank: Unknown
timestamp: July 08, 2012, 01:33:17 pm
content: Will your average cheap China special DMM (which are the only ones with transistor test sockets) handle Ge transistors?

author: SeanB
author_rank: Super Contributor
timestamp: July 08, 2012, 01:42:36 pm
content: Yes, though they may be rather optimistic gain wise due to the higher leakage current.

author: Chopsticks
author_rank: Regular Contributor
timestamp: July 09, 2012, 09:11:46 am
content: thanks eeveryone for your help, and especially Rerouter, that talking electronics link is great.....love that site
getting 18.6 volts from a 12 volt powersupply? - Page 1
Forum section: electronics / beginners

author: vulturebetrayer
author_rank: Contributor
timestamp: September 05, 2016, 08:43:29 pm
content: I'm still a bit new to figuring out power output etc, but this seems wrong.Is there something I'm doing wrong or is this power supply shitting on me?not sure why image link is broken, here's a direct link:http://imgur.com/a/LCpYG

author: Zero999
author_rank: Super Contributor
timestamp: September 05, 2016, 08:59:36 pm
content: No, it's perfectly normal and to be expected. You have an unregulated power supply, which will give a much higher voltage than its rated value, when lightly loaded. Don't use it for anything which might be damaged by the higher voltage output.

author: langwadt
author_rank: Super Contributor
timestamp: September 05, 2016, 09:07:08 pm
content: Quote from: vulturebetrayer on September 05, 2016, 08:43:29 pmThe supply has little or no regulation so the voltage will be high without load, it is quite normalfor that kind of supply

author: vulturebetrayer
author_rank: Contributor
timestamp: September 05, 2016, 09:15:24 pm
content: Thanks folks, that helps out.
Getting -5V using a PICO power supply - Page 1
Forum section: electronics / beginners

author: Pasky
author_rank: Regular Contributor
timestamp: March 18, 2015, 09:22:35 am
content: So I want to build a little project box and plan to use a laptop power supply to power a 200W PICO power supply. The PICO supply outputs 5V, 12V, and -12V. However, I am also going to be needing a -5V output as well being able to push 1A maximum on it.This is the PICO supply I was planning to use:http://www.ebay.com/itm/250W-DC-12V-mini-Pico-PSU-PC-ATX-Power-Supplies-ATOM-HTPC-MINI-ITX-Power-Supply-/161624642521?pt=LH_DefaultDomain_0&hash=item25a19453d9Is it as simple as wiring up a 7905 to the 5V rail to output -5V (EDIT: I know this won't work)? If so how do I calculate the amount of current I will lose off the +5V rail that will be used to convert it to -5V 1A? Is this the wrong way to go about this? Thanks for any help and advice you can provide!EDIT:I think I misread the 7905 datasheet, it wants a negative voltage as the input, so that won't work...hmmmm

author: Psi
author_rank: Super Contributor
timestamp: March 18, 2015, 09:45:41 am
content: 7905 needs a negative voltage. You could feed your -12V to a 7905 and get -5V.But you cannot use it to convert positive voltage to negative voltage.Sadly your -12V is only 100mA, so you cant get -5V at 1AAre you sure you need 1A at -5V. Most computers dont use anything like 1A on the -5V rail if they even use it at all.The -5V rail was made optional in ATX spec in 2002 so to fully comply with the spec any PC manufactured after 2002 should not require -5V

author: Pasky
author_rank: Regular Contributor
timestamp: March 18, 2015, 09:59:00 am
content: Yes, it won't be supplying computers, but an arcade PCB. These usually used the -5V rail to power the sound and audio amplifiers and the 1A is necessary.

author: wraper
author_rank: Unknown
timestamp: March 18, 2015, 10:24:13 am
content: Quote from: Pasky on March 18, 2015, 09:22:35 amDid you expect it to be some kind of magic device reversing polarity?

author: Pasky
author_rank: Regular Contributor
timestamp: March 18, 2015, 11:31:05 am
content: Quote from: wraper on March 18, 2015, 10:24:13 amYes,. For some reason I truly thought it could haha. Reading up on charge pumps, supposedly this is what they do. Trying to find something I can work with to get my -5V.

author: wraper
author_rank: Unknown
timestamp: March 18, 2015, 11:37:14 am
content: Quote from: Pasky on March 18, 2015, 11:31:05 amCharge pump at 1A current is insane. You need Inverting buck-boost converter.

author: Pasky
author_rank: Regular Contributor
timestamp: March 18, 2015, 09:49:32 pm
content: I see. Most are outputting 100mA only as well (buck boost). Gonna keep looking, thanks.
Getting a -12v +12v range from ATX power supply - Page 1
Forum section: electronics / beginners

author: IngerAlHaosului
author_rank: Newbie
timestamp: November 20, 2015, 10:36:36 am
content: I have a old PC power supply that outputs +3.3v, +5v, +12v and -12v, i want to convert it into bench top power supply. I want to have one of the outputs to have a +12v -12v range. I was thinking to use a potentiometer connected to the + and - rails and connecting the middle contact to the output of the power supply. I used a circuit simulator to check my idea and it appears to work however i don't know if this is ok to do IRL. If anyone know or has better idea please tell me.

author: jeroen79
author_rank: Frequent Contributor
timestamp: November 20, 2015, 10:56:31 am
content: Try simulating that with a load (a resistor to ground) connected to the output.

author: mariush
author_rank: Super Contributor
timestamp: November 20, 2015, 11:13:08 am
content: The -12v output on atx power supplies is very weak, usually under 0.5A, and it's not very well regulated.It's not suitable for anything serious.

author: IngerAlHaosului
author_rank: Newbie
timestamp: November 20, 2015, 01:02:07 pm
content: Ok, another reason i wanted to do this was to be able to set the adjust pin of lm317 from +12 all the way down into the negative

author: mikerj
author_rank: Super Contributor
timestamp: November 20, 2015, 03:17:19 pm
content: Quote from: IngerAlHaosului on November 20, 2015, 01:02:07 pmAn LM317 is a positive voltage regulator. Applying a negative voltage on the adjust pin will not magically make it output regulated negative voltages.If you want a single bi-polar output that is continuously adjustable between +12 and -12v w.r.t 0v then the LM317 simply won't do it. If you want a positive and negative regulated output then you could use a LM317 for the positive rail and an LM337 for the negative rail. However, they both have a fairly high drop out voltage (1-2.5v depending on current and temperature), so your output won't go all the way to the +-12v rails.

author: IngerAlHaosului
author_rank: Newbie
timestamp: November 20, 2015, 04:40:09 pm
content: Quote from: mikerj on November 20, 2015, 03:17:19 pmWith a adjust voltage of 0 the LM317 output is 1.25v but with a negative adjust you get all the way down to 0A for regulation i want to regulate the other +12v rail to go from 0 to at least 10

author: Simon
author_rank: Unknown
timestamp: November 21, 2015, 10:33:44 am
content: Then it seems you need a negative voltage regulator to produce -1.25V that will take the ref pin and your output down to 0V. This should work despite the -12V not providing current as your output would be from the 0V to +12V output, I think.....

author: SeanB
author_rank: Super Contributor
timestamp: November 21, 2015, 11:22:50 am
content: If you want to do that use a TDA2030 power applier, which can act as a voltage follower at DC for your pot. will source and sink 2A or so, though the sink capacity into the -12v rail will limit the current it can sink a lot. You will have a lot of protection though on the variable supply.
Getting a NACK from slave device communication through IIC - Page 1
Forum section: electronics / beginners

author: Nirupama.T
author_rank: Newbie
timestamp: May 03, 2019, 06:09:13 am
content: Hi all,I am trying to communicate with Kionix 124-1051 in my nRF52832 board using IIC. The slave is not responding after sending the slave address. I have checked all the possible conditions to make this work. Every time i get the same result. Clock, slave address, etc are all correct. But i don't know what's the problem. Any help could be appreciated.

author: rstofer
author_rank: Super Contributor
timestamp: May 03, 2019, 04:18:09 pm
content: Without a scope shot or perhaps a logic analyzer capture, we're going nowhere. Seriously! I2C is the absolute worst protocol to deal with in terms of getting it going and doing it blind is nearly impossible. I avoid it at every opportunity.When I have had problems, it was because a) I didn't formulate the address field correctly or b) the address didn't match the device or c) the pull-up resistors weren't small enough.None of this may apply in your situation but it's something to look at.Search the forums for logic analyzer recommendations. There are many from China that work with the SigRok software.
Getting a precision pwm put from bad precision pwm (variation in amplitud) - Page 1
Forum section: electronics / beginners

author: implor
author_rank: Regular Contributor
timestamp: July 03, 2025, 05:09:48 pm
content: Maybe my title is really bad so let me explain the problem.I have a PWM out from a device. The signal i 0-3.3V. So it's 0 to device VCC.VCC on this device is generated from a LDO with 2% output specification.That gives an range of 3.2934-3.366V or +/-66mVI want a worst case output to be <1% (typical ~0.5%).As I can't change or modify this device i was thinking of using a schmitt-trigger buffer (low power) that's powered by a voltage reference.Schematic is not exactly what I will do but gives an visualization of the idea.My question is if there is a better way or other solutions?Edit:The SN74LVC1G17-Q1 way maybe a bad pick. doesen't look like it has a cmos output. Imagine it's a SN74AUP1G17.Edit2:Maybe it's just better to use an OPA connected to a voltage reference. Adding a 3% gain to guarantee reaching 3.3V. OPA needs to be rail-to-rail.

author: David Hess
author_rank: Super Contributor
timestamp: July 03, 2025, 06:05:49 pm
content: There are lots of ways to produce a PWM output with precision amplitude, however your schmitt trigger buffer is probably the best for your application.The common alternative would be to use a SPDT (single pole double throw) analog switch. There are also various analog methods involving diodes, bipolar transistors, and currents which are even higher performance.

author: edavid
author_rank: Super Contributor
timestamp: July 03, 2025, 07:41:15 pm
content: I think the Schmitt trigger will distort the pulse width more than a normal inverter. If you really want precision, I would test this.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: July 03, 2025, 08:23:31 pm
content: I see no advantage of using a schmitt trigger here. Input to the logic gate is a well defined digital signal with steep flanks. The output characteristic of the logic gate would be of more concern, as it interacts with the analog signal of the RC filter. But for 1% accuracy, you only need 7 bit PWM. Back in the '80-ies quite a lot of reference voltage generators were based on PWM techniques, and linearity of 20 or so bits was achieved.
Getting a steady supply of current by a steady voltage - Page 1
Forum section: electronics / beginners

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: October 12, 2015, 11:30:53 pm
content: Hello i know the title is a little bit confusing but i was just lost myself.The problem is simple.Lets say that we have a regulator that provides 5 volts and up to about 800mA when supplied by a 3.6 volt source like a battery.But when the battery voltage drops lets say to 1.8 volts the current that it will be able to supply drops to about 100mA max.The ic i am referring to is the TPS61200.So i would like to get a steady supply of 5 volts and up to 800mA by creating a current amplifier circuit at the output of the icis this even possible ? Let me know please because i am lost ...

author: IanB
author_rank: Super Contributor
timestamp: October 12, 2015, 11:59:18 pm
content: If under given conditions the device can produce a maximum of 100 mA at 5 V, and you wish for 800 mA, then you will need eight of the devices in parallel (5 V x 100 mA = 500 mW, 5 V x 800 mA = 4000 mW, 4000 / 500 = 8 ). It goes without saying you probably will also need eight batteries to power the eight devices.Your best choice is to use a lithium ion battery that is big enough to supply the required current at 3.6 V. You cannot in any case drop a lithium ion battery to 1.8 V. The voltage is not permitted to go that low.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: October 13, 2015, 12:07:55 am
content: Thank you for your answer silly me i did not say i was going to use a Lion battery to begin with so ill have no problem with whats you just said ...but just in case i shall create a protection circuit to prevent over discharging the battery

author: IanB
author_rank: Super Contributor
timestamp: October 13, 2015, 12:12:18 am
content: It is still much better to supply the boost converter with a voltage of 3.6 V or more. If you let the voltage go lower than that the conversion efficiency will become very poor and you will waste a lot of power.

author: mikerj
author_rank: Super Contributor
timestamp: October 13, 2015, 10:24:54 am
content: Quote from: ChrisGreece52 on October 12, 2015, 11:30:53 pmIt is possible, but you would need a separate supply for your current amplifier so it makes little sense to do this. You can't have a passive circuit that magically increases the output power of a DC supply.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: October 13, 2015, 12:33:31 pm
content: Yeah after i posted the thread i thought about the current amplifier idea and i think its defies the laws of physics for the purpose i need it for.But what can i do to have a steady 5 v output with a decent amount of current.I think i would be better of if instead of a step up ic i used a fet amplifier.... or am i wrong ?
getting a "tighter" overdrive from a solid state amp - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: February 03, 2020, 05:15:29 am
content: I am modifying a tape recorder to a guitar amp and I already made a simple gain stage going in where the play head was, it has a gain of about 6 (16dB) it's simply a 12ax7 gain stage into a cathode follower.Why a cathode follower: I dunno. I just thought that I might put some kind of tone control early in the circuit.the tape player/recorder is a soviet "Sonata-304" (translated letters from Russian)I am 99% sure I won't find a schematic for it anywhere. so I'm gonna make one later.I doubt that anyone can help me with getting a "tighter" distortion without any schematic or idea on how the circuit works.so when I make the schematic I'll post it here so maybe you can helpalso, I haven't replaced the caps, it doesn't have ANY 100hz hum, only a bit of 50hz hum. I tried replacing the main filter cap with no change to the noise or tone. I still have the new ones it but they didn't help with anything really.the coupling caps I believe are all-ceramic. it uses a push-pull output stage with (I'm assuming) 15 watts. it's REALLY loud. it has a ~ -20V_0V_25V supply. I don't know why it's not equal but maybe it's cause I measured across the filter cap relative to ground.it has 2x 3*6 inch speakers and both are in series and have an impedance of 8Ohms each. so the output impedance is 16Ohms. but I am gonna probably connect a 2x 7inch 6 Ohm speakers that are pretty efficient but they were meant for about 10 watts only so it may distort as it did when I turned it up with another amp.I can also use 2 HiFi speakers in series with an impedance of 16Ohms when in series.otherwise, I will need to buy some decent speakers for it.anyway, I wanted to make it sound decent with the speakers I have.it just sounds "sluggish"the tone controls are AMAZING, while they don't do as much with a lot of overdrive, when I have a clean signal, it can flip the sound upside down.it has a decent gain with the preamp I made and pinch harmonics already "scream" so I'm pretty good with the gain it has.also, the only cap I had to replace was a 1uF ceramic for the recording oscillator thingy board. but it still doesn't want to record really. it doesn't erase and the record/play head is in terrible shape. also, it plays at the low speed to none of my reels play on it. but I don't intend to use it for reels ever again.so it would be great if you have any suggestions on making is more suitable for my needs.as I said I'll make a schematic probably so it's much easier to understand, and put it here.

author: Vovk_Z
author_rank: Super Contributor
timestamp: February 03, 2020, 07:50:56 pm
content: May be,this page can helpwith schematics.There are service manual in *.gjvu" file, find "Инструкция по ремонту" on that page (I can't place it here as attachment).
Getting FM radio to work on Bluetooth module - Page 1
Forum section: electronics / beginners

author: s27656
author_rank: Newbie
timestamp: April 08, 2025, 08:41:33 pm
content: I'd be most grateful for help with this...I've constructed a speaker with Bluetooth module that's also supposed to be an FM tuner.Whilst Bluetooth, TF card player and buttons work fine, the FM radio only seems to receive static and tuning buttons don't make a difference.I've tried swapping the module for a new one, but the problem is the same.I'm now wondering if the power source I'm using is somehow affecting the radio? The module did receive FM when I tested it using a wire antenna before actually constructing the speaker unit.The power source is a 12v battery pack, with Stepdown module to 5v which also powers the amplifier. The Bluetooth module is fed via a BOS isolated DC/DC supply component.Thanks for ideas.

author: JoanBS
author_rank: Contributor
timestamp: April 08, 2025, 09:22:26 pm
content: Hi, I have a similar module. The sensitivity of the FM receiver built into the chip is very low and is only useful for receiving local stations.Try connecting a piece of wire as an antenna; I use an external telescopic antenna and only receive a local station.

author: s27656
author_rank: Newbie
timestamp: April 09, 2025, 06:27:04 am
content: Thanks, I did this and found there is a button sequence to do a channel scan. Great! I now know it works and the reception is better with long wire.The trouble now is the reception is great when using a regular USB lead for power, but the reception is pretty awful when fitted to the actual unit and using its power supply.So I now need to understand how the power source is affecting the reception and if I can solve it?

author: s27656
author_rank: Newbie
timestamp: April 09, 2025, 12:27:29 pm
content: Update:I found the issue was that the tuner didn't like being mounted on a metal base with metal posts! Not the power source.The solution was to use transistor insulators for the corner fixings, now the tuner is working.Definitely better reception with long wire or external antenna.
Getting half value in the output of charge pump - Page 1
Forum section: electronics / beginners

author: rajbuddy
author_rank: Contributor
timestamp: October 28, 2022, 12:35:45 pm
content: Hello guys,I have made a charge pump circuit to the microcontroller where I am giving 3.3V to charge pump but I am getting 1.6V at the output which is insufficient to start the uC. Where am I getting wrong? Kindly check.Br,Raj

author: MathWizard
author_rank: Super Contributor
timestamp: October 29, 2022, 02:03:40 am
content: https://www.analog.com/media/en/technical-documentation/data-sheets/3240fb.pdfWhat voltage do u need ? It saysQuoteI never tried any charge pump circuits. How noisy are they compared to using inductor based switching sources ?

author: rajbuddy
author_rank: Contributor
timestamp: November 02, 2022, 08:23:10 am
content: Hi,i need 3.3V to be exact to start my microcontroller but it is giving half like 1.6 somewhere
Getting help from the manufacturer - Page 1
Forum section: electronics / beginners

author: jsi
author_rank: Regular Contributor
timestamp: August 06, 2016, 04:51:10 pm
content: Following on to my question about bigger projects, I've come to a sticky place and I'm in over my head. When I google the chip that is the heart of the project I only get the manufactures web site and the various parts houses that sell it. To be fair it is a very niche product that isn't something a typical home player let alone a young player is going to use. Being both a home and young (at heart) player I am a little timid about talking to the manufacturer.I know every manufacturer is going to be different, but is there a general rule about how much help to expect from them?https://www.eevblog.com/forum/beginners/bigger-project-design/msg995522/#msg995522

author: danadak
author_rank: Super Contributor
timestamp: August 06, 2016, 09:56:14 pm
content: Never hesitate to ask, worst that can happen is you get no support.FAE (Field Application Engineer) is usually an excellent point of contact. Contactlocal sales office or the manufacturers rep for contact info. Some, but in myexperience a small number, will not give you the time of day if you are not attachedto a company. But many will try to help, withing reason. They have many tasksassigned to them and goals, so support can be limited.Regards, Dana.

author: singapol
author_rank: Frequent Contributor
timestamp: August 07, 2016, 02:53:42 am
content: Put it this way, a field application engineer will only talk to you if you are working in a company that could possibly use it's products of which if the company is already a customer then this technical help is renderedas seller wants to increase sales. I'm sure if you have ever ask for free samples one of the questions asked iswhat is the expected quantity of said product's use. Other than that the datasheet is your only point of reference and whatever forum discussion by people's experience who have used such product.
Getting image form smartphone camera? - Page 1
Forum section: electronics / beginners

author: MrZwing
author_rank: Regular Contributor
timestamp: February 12, 2015, 10:13:02 am
content: Hi againIs there anyone who have tried to use a salvaged Smartphone camera in a project, without using the phone part that is just the camera?or is it even possible to use them or is it over complicated to get the thing to work, like sending image data to a computer or something similar?or prehaps salvaging a cheap usb camera from a "spy pen" an using that instead or is it just a waste of time?/MrZ

author: MrZwing
author_rank: Regular Contributor
timestamp: February 12, 2015, 02:52:53 pm
content: No one that have tried it or have any experience?

author: bktemp
author_rank: Super Contributor
timestamp: February 12, 2015, 03:01:02 pm
content: Modern cameras are difficult, because there are no datasheets for most of them. And they use MIPI CSI interface.Older cameras are quite easy:

author: electr_peter
author_rank: Unknown
timestamp: February 12, 2015, 04:33:09 pm
content: As bktemp mentioned, modern cameras are difficult to work with. Consider: tiny pin-out/rare connector; small lens setup; very high speed interface with non-trivial protocol; massive memory requirements; possibly unknown schematic/protocol.The question is what you are trying to do and what you are capable of. If need it just to work, use common cheap USB cameras or something with known datasheet. Salvaging something may be interesting, but not efficient way to go.

author: MrZwing
author_rank: Regular Contributor
timestamp: February 12, 2015, 04:52:22 pm
content: Ah well have some ideas about Building animatronic eyes with built in cameras with decent quality, and I want to try and make it as small as possible without killing my wallet.

author: mazurov
author_rank: Frequent Contributor
timestamp: February 12, 2015, 05:31:07 pm
content: Omnivision makes small cams with parallel interface which can be bit banged. This is one of the cameras ->http://www.arducam.com/camera-modules/1-3mp-ov9650/, but check Omnivision website for many more. There is also machine vision board project on KS called OpenMV ->https://www.kickstarter.com/projects/botthoughts/openmv-cam-embedded-machine-visionusing similar cam with source code posted on github.

author: MrZwing
author_rank: Regular Contributor
timestamp: February 13, 2015, 05:58:39 am
content: Thank you for that link it's something I believe it's something I can use.will look around still but it's the best I come by so far.
Getting More PCB Design/Layout Experience - Page 1
Forum section: electronics / beginners

author: caliper15
author_rank: Contributor
timestamp: April 29, 2013, 09:10:27 pm
content: I'm looking to gain more experience with pcb design & layout (especially high speed pcbs) and I was wondering if anyone had any advice as to where to get more experience?I've tried to find entry level pcb design jobs, but it seems like only Sr. level, 5+ year experienced jobs are more prevalent.

author: jmole
author_rank: Regular Contributor
timestamp: April 29, 2013, 09:21:46 pm
content: Make some open source hardware projects. Use OSHPark or a cheap asian PCB mfg to make your boards. Doing an FPGA or microcontroller design will teach you lots about proper power distribution, signal trace layout, etc.

author: marshallh
author_rank: Unknown
timestamp: April 29, 2013, 10:11:03 pm
content: Google is your friend here, there is TONS of info you just have to put forth search effort and keep reading.Design a few high speed pcbs and I and others here can give you feedback

author: caliper15
author_rank: Contributor
timestamp: April 30, 2013, 07:29:04 am
content: Quote from: jmoleI have used batchPCB and Oshpark for a few of my designs (primarily for microcontrollers). I currently don't have any income so it's a bit difficult getting my boards manufactured and assembled.Quote from: marshallhSounds good!

author: jmole
author_rank: Regular Contributor
timestamp: April 30, 2013, 09:17:53 pm
content: Also, you're going to want experience with a professional CAD program if you want a better chance at a large company. Altium seems to be the favorite around here, and after transitioning to Altium from EAGLE, I can see why.Don't get me wrong, EAGLE is a great package to learn CAD on, and it's quite fast when you get the hang of it, but it's not as feature rich as Altium.That said, Altium is buggier than a garbage dump, especially compared to EAGLE which has always been rock solid for me.

author: caliper15
author_rank: Contributor
timestamp: May 01, 2013, 06:41:13 am
content: Quote from: jmole on April 30, 2013, 09:17:53 pmI've used Altium for an intern position and I definitely like it much more than eagleCad. Creating footprints and new libraries seem much easier. Can't really say that I've noticed any bugs with Altium. It could be that I haven't used it enough nor utilized all of its features.

author: jmole
author_rank: Regular Contributor
timestamp: May 01, 2013, 05:03:43 pm
content: Quote from: caliper15 on May 01, 2013, 06:41:13 amI get crashes every 10-15 minutes it seems. Thankfully it fails gracefully, so that even after a "Catastrophic Failure" error window, I can save my work and restart the environment.
Getting Started: Curiosity, Circuits, and a Bit of Unexpected Heat - Page 1
Forum section: electronics / beginners

author: camello
author_rank: Newbie
timestamp: July 30, 2025, 07:51:11 am
content: Hi everyone,Just wanted to introduce myself—I'm new to the community and relatively new to all things home energy and electrical systems. I've always been a bit of a tinkerer, but recently I started paying closer attention to what’s going on behind the walls (and breakers!) at home.It all started when the main breaker began tripping for no clear reason—no overload, no storms, just… click. An electrician came over and pointed to a possible intermittent ground fault. Out of curiosity, a friend lent me a thermal camera he uses at work, and to my surprise, I could literallysee some hotspots on a socket and a section of wiring I never would’ve suspected. That moment kind of blew my mind.Since then, I’ve been slowly diving into power consumption, load balancing, and general efficiency. I’m still very much a beginner, but I figured this is the best place to learn from people who actually know what they’re doing.Looking forward to learning more, asking a few rookie questions, and maybe sharing some of my “DIY discoveries” along the way.

author: SteveThackery
author_rank: Super Contributor
timestamp: July 30, 2025, 10:02:54 am
content: Welcome! I'm a novice, too (I have been for the past fifty years) and I think this is a brilliant forum. You will definitely enjoy it and learn loads.

author: BILLPOD
author_rank: Frequent Contributor
timestamp: July 30, 2025, 12:32:34 pm
content: Good Morning Camello, Welcome to the forum. Did your electrician ever find the reason the main breaker was tripping? Even if it is a 100 Amp breaker, that is a LOT of load, and I wouldn't be able to sleep at night if the problem was not solved. You found a 'socket', (outlet?), that was too warm, so what was causing that? Please post what transpired, in order to solve the tripping breaker problem. "Inquiring minds want to know". Thank you
Getting started on STM32F429I-Disco board - Page 1
Forum section: electronics / beginners

author: schembri_andrew
author_rank: Newbie
timestamp: October 09, 2015, 02:37:46 pm
content: Hi, I've purchased an STM32F429I-Disco development board, and have been trying to upload a simple program, just to blink and led and at least establish connection of some sort. But before i even coded anything, I got lost in the endless barrage of software and datasheets. I downloaded CubeMX, which seems to be used only to set gpios, timers etc, and am using the Keil uVision 5 as my IDE.But the problem is that the Keil software seems to be missing HAL drivers. Are these supposed to be outputted by the CubeMX for the IDE or am i missing something very important? Or please explain to me what these HAL drivers are used for, or alternatives. Thanks a lot!The misisng hal drivers listed can be seen as an attachment (hopefully), or herehttp://oi58.tinypic.com/2hhq6b9.jpg

author: volthaus
author_rank: Newbie
timestamp: January 10, 2016, 12:16:29 am
content: I was sent a STM32F4 and I have too am using the Keil uVision 5 as my IDE. Since your original post what progress have you made?

author: cncjerry
author_rank: Unknown
timestamp: January 10, 2016, 06:41:57 am
content: Go here if you haven't already. I found his site very helpful. I tried and gave up on that board twice before digging around on his site. I can now program the hell out of that board and its family.http://stm32f4-discovery.com]http://stm32f4-discovery.com
Getting started with FPGA - Page 1
Forum section: electronics / beginners

author: chandin
author_rank: Contributor
timestamp: September 24, 2011, 11:57:23 am
content: Hi Im looking to get started with programming FPGAs.Are there good kits to get started off, any books you can recommend?Maybe a good video idea for Dave as well

author: EEVblog
author_rank: Unknown
timestamp: September 24, 2011, 12:01:47 pm
content: I just got a Papilio FPGA starter board, looks pretty good.So I do plan on doing some sort of beginner tutorial with it.No point using Altium's Nanoboard!Dave.

author: chandin
author_rank: Contributor
timestamp: September 24, 2011, 12:46:41 pm
content: I had a look at the Papilio stuff, looks like they are more focused on console game design.Im keen on learning the fundamentals, though I didn't have a detailed look as to if i can learn this stuff from the Papilio kit.good to hear you are planning on a video on the subjectcheerschandin

author: joelby
author_rank: Frequent Contributor
timestamp: September 24, 2011, 01:56:45 pm
content: Have a look at mylist of cheap FPGA development boards. I'd probably recommend one of Digilent's boards, especially if you qualify for a student discount. There's a companion book for some of them by Chu, which is a very good introduction to FPGA design.
Getting started with RTOS with LPC1317 - Page 1
Forum section: electronics / beginners

author: A2
author_rank: Contributor
timestamp: July 10, 2014, 06:20:03 am
content: I am using LPC1317, Keil uVision V4, C programming.I have experience in programming with C.Now I want to learn RTOS , where I can learn it , where to start.
Getting started with softcore in VHDL - Page 1
Forum section: electronics / beginners

author: Ribster
author_rank: Frequent Contributor
timestamp: March 20, 2016, 02:30:14 pm
content: Hey guys.I'm trying to get into softcores on FPGA's.I know VHDL, have a Basys 3 board and a MachXO2 board from Lattice.For a project, i need to implement a softcore.Where can i get started in the whole web of softcores ?I assume it's downloading the softcore IP, connecting a clock to the correct signal ?What about the hex memory for the instructions, with what tool can i compile them, should i place it in bram or ...Any help getting bootstrapped is welcome!
Getting symetrical voltages from single suppley for opamps - Page 1
Forum section: electronics / beginners

author: MAntunes
author_rank: Regular Contributor
timestamp: November 30, 2015, 06:47:24 pm
content: Hello, my name is Miguel and I am from Portugal. Sorry in advance for my english.I was looking for the best way to get symetrical voltages from one single voltage to bias op amps. Getting -/+5V with a 10 or 12V supply for example.First I thought of a voltage divider, with just two resistors. But than I realized that it could became instable.Then it came to my mind that I could use linear regulators like 78xx and 79xx.Can you help me in finding the best way?Thank you in advance for your help.Miguel

author: max666
author_rank: Frequent Contributor
timestamp: November 30, 2015, 07:00:54 pm
content: I don't know about the best one, but this might be a good starthttp://tangentsoft.net/elec/vgrounds.html

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: November 30, 2015, 07:05:36 pm
content: http://www.circuitstoday.com/dual-power-supply-using-l165http://www.goldpt.com/virtual_ground_circuit.html

author: MarkL
author_rank: Unknown
timestamp: November 30, 2015, 07:13:02 pm
content: There is a part that does exactly what you want, also known as a "rail splitter":http://www.ti.com/product/tle2426

author: MAntunes
author_rank: Regular Contributor
timestamp: December 02, 2015, 08:02:00 pm
content: Thank you all for you help!The rail splitter seems like a good idea. But the problem is its output current (max 20mA), but maybe combining it with a buffer could help raising the output current. Will do some tests!
getting the old part - LAS3700 - Page 1
Forum section: electronics / beginners

author: SnakeBite
author_rank: Regular Contributor
timestamp: April 06, 2014, 02:59:29 pm
content: Hi,i'm fixing the Lambda LQD-422 power supply and the regulator is dead. i'm having a hard time to fix the replacement parts with is LAS3700. can anyone knows there i can get this part from?i include the datasheet of the power supply (the part is mark as IC401 or IC101 since it's dual supply)http://www.mediafire.com/download/2o1xuwljcsujz4l/IMLQD420.pdfalso, i include the lambda part datasheet.can anyone help?Ido

author: SnakeBite
author_rank: Regular Contributor
timestamp: April 07, 2014, 07:46:12 pm
content: up
Getting to simulate - software download issues - Page 1
Forum section: electronics / beginners

author: armandine2
author_rank: Frequent Contributor
timestamp: September 17, 2023, 10:13:06 am
content: TINA-TI Free software?I didn't manage to download from TI - as a hobbyist. May be I'm doing something wrong or missing other ways. Anyhow I would like to follow Professor Fiore's tutorials with the software he demonstrates.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 17, 2023, 10:52:27 am
content: Tried TINA-TI some time ago and found it cumbersome, a pain to use. Mostly nobody is using TINA-TI anyway.My advice would be to use LTspice, like everybody else. There are plenty of online tutorials for LTspice.
Giant box of vacuum tubes and garage sale goodies - Page 1
Forum section: electronics / beginners

author: X_Drifter_x
author_rank: Newbie
timestamp: September 21, 2017, 02:27:43 am
content: Bought my first scope heathkit io-12 and have a box of vacuum tubes i would like to test... Any advice?https://youtu.be/1UL32CiXlbM

author: David Hess
author_rank: Super Contributor
timestamp: September 21, 2017, 06:14:20 pm
content: I had one of those oscilloscopes when I was like 8 years old. They do not have a triggered sweep so are very limited.The torch works like a Coleman white gas stove or lantern. It has to heat up and vaporize the fuel before it will operate correctly. The pan is suppose to be filled and lit to heat up the torch element before starting.

author: Seaofdep
author_rank: Regular Contributor
timestamp: September 21, 2017, 06:37:22 pm
content: lol I agree it was cool seeing that oscilloscope start up although it being old still looks like something out of a sci-fi future .I have a dso138 I won on her and thankful for, and I have had fun with. Can't wait to get a full one . Thanks for sharingSent from my iPhone using Tapatalk
giving power to a usb-c port - Page 1
Forum section: electronics / beginners

author: Epovo
author_rank: Contributor
timestamp: February 15, 2024, 07:36:04 pm
content: Hi,I need to provide power to a usb-c port in the simplest possible manner. This port is in a device that is supposed to charge some internal battery, but I don't care about the internal battery, I want to have it fully charged all the time. (I don't have access to the internals of the device). I have a 12v source available on my circuit. Can I just connect the 12v to the VBUS and GND pins and that's it? or do I need a module that supports the USB Power Delivery protocol?Thank you

author: ataradov
author_rank: Super Contributor
timestamp: February 15, 2024, 07:56:19 pm
content: No, you can't just connect 12 V to VBUS. You need to drop it to 5V. You generally don't need power delivery, unless your device can't work with the default 5V at all.
Glad to know EEVblog Electronics Community Forum - Page 1
Forum section: electronics / beginners

author: Alice Rayming
author_rank: Newbie
timestamp: June 30, 2016, 09:39:39 am
content: Hello everyoneI am a new user of EEVblog, that's very nice to know this place from my friends,hope can share more knowledge i know, enrich mine as well and know more friends here.Alice

author: bitshift
author_rank: Regular Contributor
timestamp: June 30, 2016, 11:05:29 am
content: Welcome and happy engineering

author: rsjsouza
author_rank: Super Contributor
timestamp: June 30, 2016, 11:29:49 am
content: Welcome and have fun around.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: June 30, 2016, 07:46:06 pm
content: Welcome, don't forget to bring a towel!

author: TheAmmoniacal
author_rank: Unknown
timestamp: June 30, 2016, 07:56:11 pm
content: Welcome
Glass schottky diode identification - Page 1
Forum section: electronics / beginners

author: RichardM
author_rank: Frequent Contributor
timestamp: May 13, 2025, 02:10:02 pm
content: Just cleaning up my parts bin and came across a few Schottky diodes (0.35v forward drop). Any idea what types these are ?Cheers

author: madires
author_rank: Super Contributor
timestamp: May 13, 2025, 03:00:50 pm
content: Please seehttps://www.instructables.com/From-Resistors-to-ICs-Color-Codes/(scroll down to diodes).

author: RichardM
author_rank: Frequent Contributor
timestamp: May 13, 2025, 09:50:06 pm
content: Thanks. I had identified a few but was confused with these three.Left to right1n295 1n56a 1n68b ?

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: May 13, 2025, 10:05:41 pm
content: Are you sure those are schottky diodes? The v-drop across them seems more like germanium diodes.Look closely at the diodes and see if they have a whisker like the attached image.

author: RichardM
author_rank: Frequent Contributor
timestamp: May 13, 2025, 11:31:42 pm
content: No, I am never sureI think you are correct, they are likely germanium diodes, sorry.
Glitches in clock gating cell - Page 1
Forum section: electronics / beginners

author: promach
author_rank: Frequent Contributor
timestamp: January 11, 2021, 01:20:03 pm
content: how exactly does glitch happen for rising-edge and falling-edge ICG ?Note: TE signal is asynchronous to CLKsee the red 0 and 1 at the outputWhy for the top version of rising-edge ICG, there is no X at the MSB of the latch output ?