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    Closed: Re: Buck Converter for LED Batten 310v to 100v

    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...
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    Closed: Re: Buck Converter for LED Batten 310v to 100v

    I have MJE13003 and 13005 transistors with me. They are NPN type. They can easily tolerate over 400v. Can I use them in place of the PNP??

    Thanks..
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    Closed: Re: Buck Converter for LED Batten 310v to 100v

    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...
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    Closed: Buck Converter for LED Batten 310v to 100v

    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...
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    Closed: Re: finger print scanner...

    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...
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    Closed: Re: Interrupt Exits in 89s52

    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,...
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    Closed: Re: Interrupt Exits in 89s52

    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).
    ...
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    Closed: Re: Interrupt Exits in 89s52

    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....
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    Closed: Re: Interrupt Exits in 89s52

    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...
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    Closed: Re: Interrupt Exits in 89s52

    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...
  11. Closed: Re: Fluctuating output voltage from wall wart adapters.

    @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...
  12. Closed: re: Fluctuating output voltage from wall wart adapters.

    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...
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    Closed: Re: Infrared hands free for cell phone

    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...
  14. Closed: Re: Relay controll for 230Vrms main lines wireless activation and built into the wall

    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...
  15. Closed: Re: Relay controll for 230Vrms main lines wireless activation and built into the wall

    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...
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    [SOLVED]Closed: Re: PPM signal from 8051 to control DC motor

    When creating time delays, its better to use round-up value crystals such as 6MHz, 8MHz or 12MHz.
    Try to find a 12MHz crystal.
    I have seen that datasheet. well, it isn't actually a datasheet. More...
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    [SOLVED]Closed: Re: PPM signal from 8051 to control DC motor

    You haven't mentioned your clock speed, but by your code it seems you are driving a ppm signal with 2.4ms for both mark time and space time. And your output signal is of perfect 50% duty cycle. Your...
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    [SOLVED]Closed: Re: PPM signal from 8051 to control DC motor

    Different time of pulse are like a 'time stamp' and the receiver end already knows what to do when such specific kind of pulses are received. Any other pulses not recognized by the receiver will be...
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    Closed: Re: Increasing the battery backup

    First of all: You are doing a great work by serving those who are in needs.
    Secondly, it would be helpful if you could write something about your device: like electrical parameters, working...
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    [SOLVED]Closed: Re: PPM signal from 8051 to control DC motor

    As it seems looking to your time stamps, a 0.3ms time base is common for all the operations. You can use timer to create signals only if you are clocking your 8051 in high speed. Use a round up value...
  21. Closed: Re: ups 600va intex no output voltage and no backup

    When you connect it to the wall socket and turn on the switch, does it makes any relay phase changing sound (like "tick")?
    Does it used to make such "tick" sound when it was good?

    When it is...
  22. Closed: Re: ups 600va intex no output voltage and no backup

    Could be a blown fuse in the output stage. Have you opened it to find the problem??

    Do not open it when it is connected to mains or even battery. Disconnect them first.
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    Closed: Re: Reusing a Ballast Transformer

    The circuit seems to be of a flicker free ballast with possibly 1300x series transistor. But in these fluorescent lamp circuit, these ferrite cores are inductors. Some call it a "choke inductor". It...
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    Closed: Re: Reusing a Ballast Transformer

    It doesn't works like that!! The trafo inside a ballast circuit, maybe a newer smps based flicker free or legacy LC ballasts, are used as inductors. But can you show where you found that trafo from?...
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    Closed: Re: Designing a ac/dc smps

    Have a look at this: http://www.homemade-circuits.com/2014/03/12v-5-amp-transformerless-battery.html

    This one seems to be more simple than any IC based SMPS.
    You can remove the emi filter and...
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