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Hi. Thanks for your suggestions.. I was designing a circuit using 555 ic and a mosfet. Hardly getting enough time for this project. But I will post my result along with a complete circuit diagram to help others as soon I can test my circuit. I am also thinking about using an ATTINY85 (C language...
Thanks a lot!!! Its simpler than I was expecting. As this circuit has a current sensing side, I don't have to implement any complex feedback controller circuit.
I see a PNP and an NPN transistors are being used. Also the switching frequency will be quite high depending on the PNP transistor...
Hello Members
I have a LED Batten tube (~ 4ft) which stopped working recently. I opened it up and found it is using a buck converter with a switching controller IC (NON ISOLATED). Nothing was burnt or non functional so the switching controller must be the culprit. Also I can't read its part...
This is what their datasheet says..
R-305 claims to take less search time than SM-630 (But I believe it won't matter). Consumes a little more power than the other. And can store less templates than SM-630. So it all depends on price, availability and your choice.
I would recommend SM-630...
So there's the problem.... 3.7V battery, which gives peak(stand by) around 4.2v, runs a controller with min input of 4.0v. So it is working, but by pushing the limit. When the charger is connected, a high frequency voltage fluctuation causes the controller to go in a partial & unsuccessful...
1. Try to simulate the same circuit with three 1.5v alkaline batteries in series. Then connect the charger (not to recharge them. Just to see if the low voltage of Li ion is causing any problem).
2. Try disconnecting the step up circuit or the mosfet (for the moment) and then connect -...
You mean you are not using any Li ion charger IC, just the 5V regulator, and that 5v is fed to the battery directly??? This way you might blow up your battery. Li ion's are not so easy to charge. They need to follow proper charging technique. A simple 5v regulator won't suffice. Charging ICs...
What Li ion charger controller you are using?? Some chargers uses "trickle" charge technique to charge batteries. That will cause a lot of noise.
Is your INT0 pin is taking some signal input? Are you sure the signal voltage is absolutely stable?
As what Klaus said, maybe you are pushing the...
8051's are extremely susceptible to electrical noise and fluctuations. They always go haywire. There is a chance when you are connecting the charger, its creating noise. Have you tried using an electrolytic cap in Vcc pin?
Datasheet says its "official" operating voltage is 4.0V to 5.5V @ 24MHz...
@Sunny55
16.6V in output is indicating it is a 12v RMS transformer based adapter. You need something higher than that. Or you have to use a large capacitor bank trying to make the peak voltage as the RMS (quite inefficient). A 16v zener is not of much help.
How about using a voltage doubler...
Fluctuations are highly noticed in transformer-type adapters. Is your adapter based on transformer or SMPS? Is it AC or DC type? What is the rated voltage output? Try adding a large value electrolytic capacitor (if it is DC), and if possible use a zener diode of desirable output voltage.
Infrared needs direct line of sight to communicate. I don't think there are any infrared hands free devices because it wouldn't be easy to use. You have to hold your phone near to your head and pointing your ear.. :-?
Right. If you want to control individual points (like fan, lights, TV, etc. ) you won't be needing any heat sink. But if you want to control your house's mains 'supply', then you will need a large relay (over 10amps).
Its a good idea to automate your main lines. Looks cool and makes your life easy. I also have this idea for a long time to implement in my own house, but could't spare much time on developments. But I made few research to find out the best options for implementing it. I think you should have a...
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