Wow first time I am listening (reading) such comment from an expert to me. Feeling like- I am also starting to became an expertHi,
That's pretty good really.
I thought R5, 1k is enough, but now I guessed (from your correction), I had to isolate opamp using additional 1k resistor for efficient feedback (1Meg).Just one small thing, notice the other circuit had a 1k resistor on the output of the reference. So you have to move the 10uf cap to the left then install a 1k resistor from the top of the 10uf to the 1M resistor and non inverting input so it is just like the other circuit.
Yes I understood the operation. I will set 1st voltage 4.16V and 2nd voltage to 4.15V. I understood that comparator won't give ON output if it cannot get more than 4.15v (more than 1st voltage level). I think this monitor is very nice than before.The 4.15v measurement is at point A common to the battery negative terminal ( -Battery ).
On the new schematic below, the 4.15v is between points A and B, and is measured when the battery is not yet fully charged.
Of course if you set that to 4.15v then you must set the other voltage setting to charge the battery to around 4.16v or the voltage monitor LED may never turn on.
OK I will use 8V to get less heat. Sorry I even didn't know which parts are needed for monitor, so I didn't tell you about TL431. I have few pieces from old SMPS of PC, cell phone wall wart supply.You may not need the whole 10v, that's just there in order to have some value shown. You might be able to use 8v or 9v, but if the regulator gets hot then use a heat sink. The second LM317 can be a regular type in the original circuit but since you now use a TL431 you dont need it. You never mentioned that you also have TL431's on hand too.
I almost know nothing about digital electronics (PICs/microcontroller). But I always think that if I could handle that programmable chip, I would make make almost Anything!Hi,
Ok yeah if you draw the whole thing out that would be nice.
Also i though i would mention that you can make a really really nice monitor using a microcontroller chip, even a cheap low end uC chip. I dont konw if you can get these but you would be very happy if you could, as well as a flash programmer to program it. Using the built in ADC you could monitor both the voltage and the current. That's what i do with my charger, and i have a readout that tells me what the voltage is AND what the current is. By looking at that, you know right away if it is done charging or close to done. So you may want to look into these chips to see if you can get any (not sure if anyone asked you yet).
I just can write simple HTML codes hehe I bought lots of DVDs and CDs of C+, C++, Java, PHP, lotus and many more...... The disk has programming softwares and guides but they are teaching for advanced learner there. But I even do not no 'P' of programming. So I guessed it takes me long. But in future I like to learn C++, because it is very necessary I feel.Well let me ask you this then: Did you ever write a program of any kind in any language for the computer or other device such as programmable calculator?
If you had any programming experience you would pick it up in a week most likely, but if not it might take longer.
Yeah, I am learning 'basic electronics' very well because I am learning it from American ex. engineers!You did pretty well with the TL431 as a substitute for the LM317 so that's why i think you could pick it up fast enough.
I feel so good to be engage with such stuff and I have huge interest in programming so had bought lots of programming DVDs but I even didn't knew that where to start and were to write codes.Not sure how much time you like to dedicate to this stuff either though.
...If you use two LED's like that you probably want to make it so you can adjust each section voltage independently...
...maybe add adjustments for the two LED's...
It is just a simple solution but in real there are lots of problems. It's very hard to buy American components specially for Asian people. America is much more expensive area. For example in case of my country- If I got a job which is middle class for here, they will provide around Rs. 20,000 per month. If I converted this currency to US dollar it's just $200. May be it is little funny salary as a 'middle class salary' for Americans, isn't it? And digikey takes around $50 as a shipping charge, if I included components charge it might be more than $100. Once I visited digikey website, I found a normal trimmer caps which is rated $4. It means my currency Rs. 400. I think I can buy almost entire components for a simple small project here if I spent $4 here.I am just wondering if you can order things from www.DigiKey.com? I think they ship everywhere in the world and shipping is very reasonable.
You can also buy chips on eBay.
I always feel happy. I feel extreme happiness a few times every day. My family gives me happiness. My pets also give me happiness. I am grateful that I am healthy and I have nothing to worry about.may be you never got such opportunity to feel extreme happiness.
Yes, and I am trying to upgrade my life (life status) for these even cheap shipping rate and cheap components. Hope my dreams will come true...very soon... I will note these all sites, thank you lots!
At least, I realize the value/importance of each and every single and tiny electronics components due to such unavailability of components. If found an IC or a transistor or any unique parts, it gives me a lots of happiness, may be you never got such opportunity to feel extreme happiness.
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