I Need Help,, How can i build ADC without using Microcontrollers? - Page 1
Forum section: electronics / beginners

author: MMDuino
author_rank: Regular Contributor
timestamp: April 21, 2015, 10:52:43 am
content: I need to build a digital circuit to control Analog stuff and vice versa...

author: tszaboo
author_rank: Super Contributor
timestamp: April 21, 2015, 11:00:11 am
content: You can do it with CPLD, FPGA, or cobble together it from logic gates. Any ADC without registers should work, I would try it with something like ADC0801. As much as I like logic circuits, this is pretty pointless unless you send it to space or other niche application.

author: PSR B1257
author_rank: Frequent Contributor
timestamp: April 21, 2015, 11:15:38 am
content: Wow, extensive informations.Extensive answer: Google forresistor dac/adc

author: MMDuino
author_rank: Regular Contributor
timestamp: April 21, 2015, 11:24:27 am
content: if i want to use google, that's mean,, the forum here useless, just wasting my time...Quote from: PSR B1257 on April 21, 2015, 11:15:38 am

author: BradC
author_rank: Super Contributor
timestamp: April 21, 2015, 11:26:47 am
content: Quote from: MMDuino on April 21, 2015, 11:24:27 amNo, the fact you ask here *before* doing any research of your own shows you waste *our* time. Do you honestly believe your time is more valuable than ours?

author: MMDuino
author_rank: Regular Contributor
timestamp: April 21, 2015, 11:33:00 am
content: Yes certainly... moreover if you think you don't have time for people like me ,, it's easy,, don't reply on my posts,, pal....catch ya next time...Quote from: BradC on April 21, 2015, 11:26:47 am

author: Simon
author_rank: Unknown
timestamp: April 21, 2015, 11:42:17 am
content: Quote from: MMDuino on April 21, 2015, 11:24:27 amActually you are wasting our time! you come with next to no information, asked very ill informed questions and then get "upset" if we don't hand you what you want on a silver plate.

author: Richard Crowley
author_rank: Super Contributor
timestamp: April 21, 2015, 11:47:41 am
content: We don't really understand your question, or even you reason for asking your question.An ADC does not use a microcontroller, so your question doesn't even make sense.We don't even understand why you want to "build ADC" when you can BUY an ADC that is better, smaller and cheaper than anything you can "build".

author: MMDuino
author_rank: Regular Contributor
timestamp: April 21, 2015, 12:05:41 pm
content: Dear RichardI respect your reply so much,you've been touched my wound,, unfortunately i can't buy for what i need here, ,the problem is i have to deal with what i have in my markets,,i know there are prity ADC ICs e.g. (ICL7106, ADC0803/804/808/809 and TLC0834 838) but i'm trying to build it myself by using Opamps, TTL ICs and CMOS ICs,,,So, my question was just inquiry and really i know there is someone do it before me so we can share our informations, so really i dont like to argue with any one here,, and as i said before if the people here can't answer my questions so why they reply on my posts..Quote from: Richard Crowley on April 21, 2015, 11:47:41 am

author: AndreasF
author_rank: Frequent Contributor
timestamp: April 21, 2015, 12:22:15 pm
content: I've never done it, but I suspect that the easiest way to build an ADC with logic gates etc would be a "dual slope (integrating) ADC"e.g.http://www.allaboutcircuits.com/vol_4/chpt_13/8.htmlhttp://www.asdlib.org/onlineArticles/elabware/Scheeline_ADC/ADC_ADC_Dual_Slope.html

author: Grapsus
author_rank: Regular Contributor
timestamp: April 21, 2015, 12:42:36 pm
content: Don't you think this guy is some kind of troll ?

author: macboy
author_rank: Super Contributor
timestamp: April 21, 2015, 01:01:58 pm
content: Quote from: MMDuino on April 21, 2015, 11:33:00 amSo the people here are "useless", and moreover, you are more important than us.That is sure to inspire the community to help.You have much to learn... not only about electronics.

author: Monkeh
author_rank: Super Contributor
timestamp: April 21, 2015, 01:27:46 pm
content: Quote from: MMDuino on April 21, 2015, 01:09:23 pmYou know those first impressions? You're making great ones. Really.

author: Cliff Matthews
author_rank: Unknown
timestamp: April 21, 2015, 01:33:07 pm
content: Quote from: Monkeh on April 21, 2015, 01:27:46 pmDefinitely..

author: Delta
author_rank: Super Contributor
timestamp: April 21, 2015, 05:02:20 pm
content: Why not just upload your entire college coursework curriculum, and get forum members to do it all for you? That would save all involved a lot of time...

author: Richard Crowley
author_rank: Super Contributor
timestamp: April 21, 2015, 05:15:26 pm
content: Your requirement to "control stuff" gives us nothing to work with.If you have some specific project or problem to deal with, please provide details.Now, if you are asking if there are simple ways to generate semi-analog voltages from digital signals without using a DAC chip, then certainly there are.For example:http://en.wikipedia.org/wiki/Resistor_ladderOr to generate digital signals from an analog voltage, you can use a series of voltage-comparators like a "Flash ADC"http://en.wikipedia.org/wiki/Flash_ADCWikipedia is actually a decent place to research basic questions like yours.

author: German_EE
author_rank: Super Contributor
timestamp: April 21, 2015, 06:51:22 pm
content: Gentlemen, please could we pause for a moment here?User MMDuino is from Iraq, a country where (thanks to war and sanctions) it will be difficult to get a lot of the things which we have easy access to. He may also not have access to things like Wikipedia and Google, sites which are censored in a number of countries. Also please consider that apart from the culture gap his first language may not be English.MMDuino, I know that you may have questions and are hungry for answers but there are a few simple rules that everyone follows so that this forum can run smoothly. After you have typed out your question please then mention what work you have done so far in your research. Saying that "you need to build a digital circuit to control analog stuff" is far too vague and we need more information before we can help you. Finally, posts such as "Rubbish" help nobody including you, please stop it.

author: tggzzz
author_rank: Super Contributor
timestamp: April 21, 2015, 07:22:14 pm
content: Quote from: MMDuino on April 21, 2015, 11:24:27 amYou will benefit from reading "How to ask questions the smart way", which is specifically written for forums like this.http://www.catb.org/esr/faqs/smart-questions.html

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 21, 2015, 08:19:29 pm
content: Quote from: MMDuino on April 21, 2015, 01:34:38 pmi'm guessing you just dont have a clue of what you are asking.... "to make digital circuit to control analog".... without mcu. if you dont want mcu, if you have a very limited supply, then you do it all in analog savvy? no need overcomplicated phoolery design. there is a rule famous in the community, we call it GIGO meaning rubbish answers are due to from rubbish question.

author: MMDuino
author_rank: Regular Contributor
timestamp: April 22, 2015, 06:33:09 am
content: Thank you very much German_EEI asked my question cause i thought as i said before, should be there is someone did that before me without using ADC/DAC ICs or Microcontrollers, because really i have very limit access to the electronics world, my idea it's convert analog signal to digital e.g. ,,to measur voltages or cuurent, cause i have only 7 Segments devices, TTL+CMOS family and some Opamps,just i was thinking what i did to face third world war here , i think it's enough in the real world...Again thanks for your understanding...Quote from: German_EE on April 21, 2015, 06:51:22 pm

author: Simon
author_rank: Unknown
timestamp: April 22, 2015, 08:37:23 am
content: But you need to give us more detail about what your trying to do, you are asking very vague questions that have no certain answer. One liner questions about topics that could require a very long answer for each of the possible dozens of answers just leaves people feeling insulted, and then you add to it by getting upset. We have nothing to do with your current real world conditions, sob stories don't help us help you. If for example you specify what resources you have like books, how much of the internet you can use and what sort of parts you can get then we can find a more specific answer to your question.

author: Zero999
author_rank: Super Contributor
timestamp: April 22, 2015, 09:56:25 am
content: It sounds like you want to make a volt/amp meter?It's possible to do this without a micro controller but you still need a specialist IC, otherwise it's very difficult.There are numerous ICs designed for this which are fairly widely available.ICL7106/07http://www.intersil.com/content/dam/Intersil/documents/icl7/icl7106-07-07s.pdfMAX1447-MAX1498http://datasheets.maximintegrated.com/en/ds/MAX1447-MAX1498.pdfOr you could use the CA3162 and CA3161 as shown here.http://www.eleccircuit.com/the-cheap-digital-voltmeter-using-ca3162-and-ca3161/Otherwise you're stuck with using a large number of ICs.How about buying a panel meter off ebay? It'll probably work out much cheaper and can be modified to suit your needs.

author: timofonic
author_rank: Frequent Contributor
timestamp: April 24, 2015, 12:16:56 am
content: Quote from: Hero999 on April 22, 2015, 09:56:25 amEbay? He's in Iraq, please think before commenting. He has no access to that.Where's the hard way? What about old designs not requiring complex ICs? Logic gates, flip flops, open amps, transistors and such.What ICs do you have access to? Please specify about your available resources

author: Dave
author_rank: Super Contributor
timestamp: April 24, 2015, 02:46:07 am
content: It probably wouldn't be too difficult to create a SAR ADC with just standard logic chips and a comparator. 8 bits should be easy to achieve, if you matched the resistors for the R-2R ladder.

author: timofonic
author_rank: Frequent Contributor
timestamp: April 24, 2015, 09:46:40 am
content: Quote from: Dave on April 24, 2015, 02:46:07 amDo you have a example? Please!

author: tggzzz
author_rank: Super Contributor
timestamp: April 24, 2015, 09:51:51 am
content: Quote from: Circuiteromalaguito on April 24, 2015, 09:46:40 amGlad to be of servicehttp://lmgtfy.com/?q=SAR+ADC+with+just+standard+logic+chips+and+a+comparator