@abdullahkahraman why would you consider it harsh that some people cannot handle smaller components? I always lose 0603 parts, but anything bigger is simple.
okay so i'm making code for my girlfriend for our 6th anniversary.
I'm a complete noob to programming. I'm writing some very simple code to make, basically an input output machine of number inputs, in order for the user (her) to receive string outputs.
i keeps seeing "none" when i run my code....
Project needs
We need an inexpensive LED driver IC that:
Can source or sink at least 15mA/LED
Has an SPI-like interface (not I2C)
Has a separate latch pin
Has at least 256 grayscale intensities
Preferably at least 8 channels/chip
Can anyone recommend some devices to consider? I think multip...
And, with 8 channels per chip interface, 360 LEDs, that means you need 360/8=90 chips, right? That also means you need 90 CS lines, if you're going to use SPI.
@abdullahkahraman OTA's and CCII are the most commonly used. Most of the op-amp stuff you see on this site (voltage feedback voltage input) isn't commonly used on the inside. So the bulk of op-amps in use these days are probably of that genre. In fact most modern op-amps, norton mode current feedback etc. will ave something similar to an OTA in there. SO the answer is - everyone, they just think they are using something else.
@abdullahkahraman the second author Edgar (hyphenated name) on the first reference is well known in the field. Anything with his name on it is worth while. I'm sure @W5VO has some recommendations being a grad student and all.
@abdullahkahraman what is your text? Unfortunately, I can recommend text's but it will be lots of money. I have some printed out course material here but not in pdf.
For example, he wanted us to design circuits from simple amplifier to negative impedance, voltage adder, gyrator, current controlled resistor, voltage controlled resistor etc.
@rawbrawb He told us to do some "brain-gymnastics", but he also added that these information is not like "secured in a safe", "you can research".
I think most of the issue now is the graphics.. I don't know how to draw them professionally. I cannot mess up with TikZ, I don't have the time for that :)
@rawbrawb I am so new to school that I even don't know where the library is.
@rawbrawb Thank you for your time. I have to go now. I guess I will deliver this homework one week late, too.. It is hard to work and study at the same time.
@rawbrawb Sorry, I've been out of the analog IC loop for a bit
pumping 30kW (peak) through an H-bridge - slightly different frame of mind than OTA's
@abdullahkahraman Call/Email the library and see if they have online access to IEEExplore. If they do, see if they have provisions for off-site access. Our uni does, and I can browse to my heart's content at home
@user1832583 Though I would think you could also turn off the powering option: it's useful to be able to program a chip without providing it with power. But most of the time I have the programmer power the chip: makes things easier.
For me, it is hard to tell what it means from the website (I've never used the AVRISP). ? "No target power" = "I will not provide target with power"? ? "No target power" = "No target power detected, so I'll provide it with power"? Something else?
@user1832583 Sorry to hear about your troubles, and the $30+ flushed down the toilet. You can use your Uno to program the ATtiny :) @jippie is all about Arduino ISP programmers. I myself use a USBtinyISP, haven't had any problems yet.
Another question: how much work do you want to put into your programmer? Do you want to make it from scratch? Do you want to solder it together? Or do you want it to be ready to go out of the box?
Just jumping in here to say that an USBTinyASP or USBASP clone, at some $2 to $3, works quite well with AVRdude, and the added benefit is that one can afford a few explosive situations without being significantly out of pocket.
Also if you intend to program a bunch of DIP AVRs over time, a small suggested investment: Use a ZIF socket on a board, add in a socket to plug in your USBASP, and you're all set. No broken IC pins, easy life.
@user1832583 If you are one of those people (like me) that tends to break things, then I would recommend a cheaper programmer. Like one of these Ebay things.
@AnindoGhosh I don't know if I agree with this: you will still need to build a circuit with your chip. Taking it in and out of the programmer - back and forth between prog and breadboard doesn't sound like fun.
@user1832583 SparkFun does, they just mark up anything you can find on EBay by about 50 to 100% for the poor saps who thus get poorer buying from them :-)
@angelatlarge My proposal is around a situation where you want to program a series of ICs - Just dump one into a ZIF, program it, then plug it into your circuit.
@angelatlarge Look, that I can debate with data: I've seen a bunch of SparkFun boards, and they were more often than not, of the same exact quality, perhaps even from the same factory, as corresponding items from eBay. I'm not referring to eBay crap items, but the better ones - and I buy a lot of those.
@AnindoGhosh The other thing is that buying from SparkFun you don't need to know which ebay item is a quality one and which isn't. They products are supported, documented, and like I said, SparkFun does a lot for the maker movement here.
@AnindoGhosh And I think if people want to support them (as I do), you should let them.
@angelatlarge Fair enough. If I were on a US$ budget, I'd not mind the premiums, they are not as much as some niche sellers have. However, for an Indian Rupee budget, the couple of US$ here and there are a big deal.
@angelatlarge Also agreed. On a similar vein, if people want to point out lower cost options albeit with higher risk (as I do), that should be fine too :-)
@AnindoGhosh I wouldn't think of recommending SparkFun to a person in India. If anything you guys should be supporting your local maker movement promoters, such as yourself :)
@AnindoGhosh Hard to argue with those last two points.
Most important of all, I guess a few years of heavy duty eBay farming builds up both an instinct for the crap products, and a skill for finding items at the best deals... So it's not for everyone.
@angelatlarge There are unfortunately only a couple of local manufacturers who do anything worthwhile - the rest are shameless scalpers. There are perhaps two vendors in India I am happy with: The InduinoX guys, simply for making something sufficiently value-added to merit a price premium, and nex-robotics.com for a great inventory and fantastic delivery time.
@angelatlarge Yup, it's exactly like a grind-based MMORPG.
@angelatlarge The two big issues with Indian sellers: (1) They cheat the customer on shipping cost - we're talking massive mark-ups compared to what the shipping company charges even for an individual walk-in customer (2) Almost ubiquitous lack of support for online credit card payment.
The lack of online payment is largely because the taxation and paperwork for selling something in India are totally non-business-friendly, so most of the transactions get done offline and hidden away without reporting them on the books.
@angelatlarge China to India delivery varies from 1 week (stuff shipped from Hong Kong) to 6 weeks (shipped from mainland China), but rarely does one Get a non-delivery. ... and I for one never order something which has a shipping fee, unless the item is a kilo or more in weight.
@angelatlarge Yup. Unfortunate. There's no way indigenous intellectual property or trade will reach first world quality as long as the government is out to scalp the citizen multiple times per transaction. Double taxation? No, that's on a good day. Besides the official taxation at ingress and egress, there is bribery needed just to keep the shutters up.
@AnindoGhosh When I buy from Ebay, I just order by cost+shipping, and look from cheapest on up.. I don't really care if the shipping is officially free or not: they either build the cost into the product price or they charge you separately. Either way, what comes out of your pocket is the same. I don't care what they call it.
@angelatlarge That used to be true until 4-5 years ago. Some sellers I deal with regularly report that the Chinese government has given them a sweet deal on any "small packet" envelope shipping: No postal charges as long as the transaction is reported and the ForEx properly accounted for. Most sellers make their profits from that shipping price difference.
@angelatlarge That can only be Italy / Sicily / middle or far east
@angelatlarge Ooooooh a country I always wanted to revisit. I went to Moscow as a child. Loved it.
@angelatlarge Subsidized as a means of bringing small scale exporters into a business environment where other nations cannot compete. I think it's a brilliant strategic move - the postal department picks up the cost which then gets subsidized by the foreign exchange benefits accrued to the international trade department.
@angelatlarge Basically, the more the balance of trade favors export over import, the greater the value of one's currency over foreign currencies. The Chinese small merchants don't receive their money in US$ or whatever the transaction was in, they get the equivalent renminbi. The ForEx goes to the government coffers, strengthening their position in international trade.
@angelatlarge What's interesting is, though, that not all exporters get that free postage benefit. There are a bunch of terms and conditions involved, and I suspect some subjectivity and silver-crossed-palms
@rawbrawb Nahh, World Domination proposal got shut down ;-)
When making an monostable circuit with a 555 timber, the time that pin 3 is on is calculated using this:
time on = 1.1 x R1 x C1
My question is why is 1.1 included.
@angelatlarge You need to tag a couple more questions with it --- if there's only one the tag can be automatically cleaned up. (Not sure if you actually need some non-closed questions, which would be tough for this particular tag).
Also, never repeat that word Tantalii, it's what one funny prof from my college days used to call them if there were several: "1= tantalum, 2 = tantalii"
@angelatlarge Used by some DIY audio enthusiasts. Basically, two pol-caps back to back, half the capacitance at a tenth the price of a corresponding amount of polyfilm capacitance.
@angelatlarge This is what I love about electronics: There's always more to learn, and not necessarily in the arcane world of lethal chemicals and airborne glass particles
OK now someone point me to something interesting in Electronics that is within my design/infrastructure capabilities, exciting and new, and forces me to waste a few hours madly researching it. :-) @angelatlarge I gave you non-pol-electrocaps, it's your turn.
@coding_corgi To provide you some context, some of us here in chat are a bit on the electronics geek end of things - we get excited and chat for hours about transformers made without magnetic coils. :-)
Project needs
We need an inexpensive LED driver IC that:
Can source or sink at least 15mA/LED
Has an SPI-like interface (not I2C)
Has a separate latch pin
Has at least 256 grayscale intensities
Preferably at least 8 channels/chip
Can anyone recommend some devices to consider? I think multip...
okay so i'm making code for my girlfriend for our 6th anniversary.
I'm a complete noob to programming. I'm writing some very simple code to make, basically an input output machine of number inputs, in order for the user (her) to receive string outputs.
i keeps seeing "none" when i run my code....
Project needs
We need an inexpensive LED driver IC that:
Can source or sink at least 15mA/LED
Has an SPI-like interface (not I2C)
Has a separate latch pin
Has at least 256 grayscale intensities
Preferably at least 8 channels/chip
Can anyone recommend some devices to consider? I think multip...
flush it down et toilet........
When making an monostable circuit with a 555 timber, the time that pin 3 is on is calculated using this:
time on = 1.1 x R1 x C1
My question is why is 1.1 included.
