Anyone good on electronics?

[Baron von Lotsov]

If you want to reverse-engineer something then first of all find out what it is supposed to do.



The battery is nickel–metal hydride and the charging regime is constant voltage at a low current until fully charged and then off, since if you keep on charging you will damage the battery. There are two ways to achieve this. You either have a small microprocessor to do it like those pic chips, or you use analogue electronics. A posh charger will of course use a microprocessor and probably even have an LCD screen to tell you what is going on, but these things are made to be dirt cheap and also very low power, so it will be using analogue electronics. In chips you can't have large capacitors, only ones of a few pF, so chips are mainly transistors and resistors. If you want a large capacitance in a chip circuit it either has to be external or simulated using a small capacitor and transistors. Likewise with inductors, they are rarely used except in very high frequency microwave type chips. There are a few small analogue chips where the data sheet gives the entire schematic of the chip, like the 555 and the 741, but it is nearly always the case that data sheets only give block diagrams of chips and possibly equivalent circuits for inputs and outputs for interfacing with it.  



You'll just have to stick with what you have.

[Borchester]

If it's not a daft question, what (apart from educating yourself) are you trying to achieve ?? what problem are you trying to solve. Because the golden rule of the business I'm in (which admittedly is these days more software than soldering) is "if it isn't broke (and the supply of spares is plentiful) don't ***k with it"

I know nothing about them. I have a dim memory from uni about using Norton's Theorem to find equivalent circuits and thought it might be fun to investigate. I also have a mountain of cheap, cheerful and broken solar powered fairly lights that I would like to fix. But  mostly I would like to know a bit more than I do now.

 :hattip

[johnofgwent]

Thanks John. I rather suspected that it had been patented. Bloody Chines. After all that opium we gave them.



Apparently the point of a Shoktty diode is that it is fast, which is what one needs in a computer. I shall crack on until I find some crooked little nerd who has broken the Chinese patent wall.

If it's not a daft question, what (apart from educating yourself) are you trying to achieve ?? what problem are you trying to solve. Because the golden rule of the business I'm in (which admittedly is these days more software than soldering) is "if it isn't broke (and the supply of spares is plentiful) don't ***k with it"

[Borchester]

A shoktty diode and a couple of (presumably transistor) switches. So says the text of the data sheet. What's more useful is the statement that the thing is patented. So the patent office in the country if registration is your best bet to find out exactly what's inside it.



Fifty years ago I would have known what a shoktty diode was. Regrettably today I've no bloody idea. I stopped soldering things about thirty years ago...

Thanks John. I rather suspected that it had been patented. Bloody Chines. After all that opium we gave them.



Apparently the point of a Shoktty diode is that it is fast, which is what one needs in a computer. I shall crack on until I find some crooked little nerd who has broken the Chinese patent wall.

[johnofgwent]

Many thanks.

The problem is that none of the diagrams explain what is actually inside the IC.

But thanks again

A shoktty diode and a couple of (presumably transistor) switches. So says the text of the data sheet. What's more useful is the statement that the thing is patented. So the patent office in the country if registration is your best bet to find out exactly what's inside it.



Fifty years ago I would have known what a shoktty diode was. Regrettably today I've no bloody idea. I stopped soldering things about thirty years ago...

[Borchester]

You wart eyed wazack  :rant:  ::

look at post no 4,did you read the pdf like I asked?

The wiring diagram is in that,here's the link..again! :roll:  :kikass:  ::

http://www.datasheetcafe.com/5252f-datasheet-pdf-led-driver/">//http://www.datasheetcafe.com/5252f-datasheet-pdf-led-driver/

Don't shout at me!



I have a wife, children and grandchildren to do that.



Actually, many thanks. It is just that the Functional Block Diagram gave three main blocks: the light sensor, over discharge protection and the driver. I assume that those are actually made up of tiny inductors, capacitors and those gates that I could never figure out when I was at Uni. And I thought it might be fun to try sorting it all out without resorting to a breadboard.

[cromwell]

Then crack on and give me the answer. I am not a young man any more and you kids should expect to repeat yourselves three or four times

You wart eyed wazack  :rant:  ::

look at post no 4,did you read the pdf like I asked?

The wiring diagram is in that,here's the link..again! :roll:  :kikass:  ::

http://www.datasheetcafe.com/5252f-datasheet-pdf-led-driver/">//http://www.datasheetcafe.com/5252f-datasheet-pdf-led-driver/

[Borchester]

That's because what is inside the IC is a tiny computer and it's magic.  :hattip

Actually, I am beginning to suspect that.  :hattip

[Barry]

Many thanks.

The problem is that none of the diagrams explain what is actually inside the IC.

But thanks again

That's because what is inside the IC is a tiny computer and it's magic.  :hattip

[Borchester]

You bloody numpty you started two threads on same subject 5 minutes apart,tried to answer your question hours ago. :fcplm:  ::

Then crack on and give me the answer. I am not a young man any more and you kids should expect to repeat yourselves three or four times  :hattip

[Borchester]

OK that makes sense. It's an all in one chip for solar LED lighting. It looks like a boost converter, where it takes a particular voltage range from the solar panel, then it converts that to charge the battery, which needs to be charged a certain way, either constant voltage or constant current, depending on the type and at a higher voltage than the input from the panel. The diode and inductor are part of the boost converter circuit and the rest is in the chip.



This link explains what a boost converter is.

https://en.wikipedia.org/wiki/Boost_converter">https://en.wikipedia.org/wiki/Boost_converter

Many thanks.

The problem is that none of the diagrams explain what is actually inside the IC.

But thanks again

[Scott777]

I know b all about the subject but would like to find out something.



So to start with, the QX5252F, which is an IC. When I look it up I get something like this..



Which is clever stuff but just shows the IC with a a few inductors and such attached. It does not show how the QX5252F is actually made up.



So if anyone has any idea of how I can find a circuit diagram of this particular IC I would be much obliged.

I could never get into electronics at college, but batterie might be a battery.  Or not.  :thup:

[cromwell]

I know b all about the subject but would like to find out something.



So to start with, the QX5252F, which is an IC. When I look it up I get something like this..



https://www.madeinfck.com/wp-content/uploads/2018/01/SolarLightDiagram.png">



Which is clever stuff but just shows the IC with a a few inductors and such attached. It does not show how the QX5252F is actually made up.



So if anyone has any idea of how I can find a circuit diagram of this particular IC I would be much obliged.

You bloody numpty you started two threads on same subject 5 minutes apart,tried to answer your question hours ago. :fcplm:  ::

[patman post]

Why don't you try baking instead?  

Wouldn't that only be good for oven chips...?

[Baron von Lotsov]

I know b all about the subject but would like to find out something.



So to start with, the QX5252F, which is an IC. When I look it up I get something like this..



https://www.madeinfck.com/wp-content/uploads/2018/01/SolarLightDiagram.png">

OK that makes sense. It's an all in one chip for solar LED lighting. It looks like a boost converter, where it takes a particular voltage range from the solar panel, then it converts that to charge the battery, which needs to be charged a certain way, either constant voltage or constant current, depending on the type and at a higher voltage than the input from the panel. The diode and inductor are part of the boost converter circuit and the rest is in the chip.



This link explains what a boost converter is.

https://en.wikipedia.org/wiki/Boost_converter">https://en.wikipedia.org/wiki/Boost_converter