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  1. R

    How to achieve the lowest current consumption during sleep mode?

    Hi dear friends, I'm working with an mega169a ultra low power version which is running arduino butterfly. On the datasheet it says, during power save mode the current goes down to 0.8uA. Anyway, in my code I've shut down everything as much as I can remember, but still it won't go below 210uA. I...
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    Dealing with infinite loop in an Interrupt Service Routine !!

    Thanks for the comment. INT0 has the higher priority than INT1. Ok, I think using infinite loop was not a good idea, but can I use a normal variable controlled loop in ISR?
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    Dealing with infinite loop in an Interrupt Service Routine !!

    Hi guys, Facing problems with ISR. I don't know to stop an infinite loop in an interrupt service routine. I have set 2 ext. interrupts. Now int_0 service routine has an infinite loop inside of it that just makes a pulse train.. But I want this while(1) infinite loop to stop whenever the other...
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    Protocol needed for PS2 optical SCROLLING mouse.

    Hello tpetar, many thanks for these links. they are really helpful. :)
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    Protocol needed for PS2 optical SCROLLING mouse.

    Hello guyz, I'm gonna interface a ps2 optical mouse with my AVR mega8 MCU. I;ve searched over internet for the protocol details, and I've got some of them which describes mice with 3 buttons(didn't say about the wheel) but I couldn't find any protocol details describing for mice with Scrolling...
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    [SOLVED] Advice on power supply schematic

    Hi Jim, thanks a lot for the circuits. :D nice stuff. Well I just wanted to make a very very simple DC power supply, so I think maybe I should gor for the series connection. Also the secondary has current limitation according to the wire gauge. well It's nice to have a 10 Amp power supply. RS..
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    [SOLVED] Advice on power supply schematic

    I heard some guyz to say that, they've destroyed their MCUs supplied from smps. I guess linear is more jitter free than smps. Well, a personal problem. I need to power up two peltier coolers (each rated 12v, 5A, 60W) from a transformer rated at output (12v-0v-12v, 6A). what shold I do...
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    [SOLVED] need a stable FM transmitter for home use

    Wow. tons of circuits !!! Thank u sir. :)
  9. R

    [SOLVED] need a stable FM transmitter for home use

    Sir, can you pls send me one varactor based and one PLL based FM transmitter schematic? I've made two miller based FM transmitters but they suffer a lot frequency drifting..... Rocket Scientist.
  10. R

    Need sugggestions for making class B audio amplifier

    Which software did you use to make the simulation? I used multisim and the result was much worse than yours. :( - - - Updated - - - what kind of difference?? As far as I know inductive load takes more current from the supply than the resistive ones. Can this somehow drop the supply voltage?
  11. R

    voltage limitation circuit

    It seems like you need a programmable voltage regulator. Well, if you don't like normal voltage regulators, then you may use a micro controller attached with a transistor working as a programmable voltage regulator with the supply to the IC. You can sense the input voltage and according to it's...
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    Need sugggestions for making class B audio amplifier

    Oops !!! I've made a typing mistake. Actually my mini subwoofer is 3 inches of diameter. Still, as you told, I shouldn't expect a lot of bass, but obviously it would be somewhat greater than that of a 2 inch cone. It's price is 1 USD here in local store. Thought I could get started with it...
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    Need sugggestions for making class B audio amplifier

    Hello guyz, How are you all? Some days ago I've bought a mini 2 inch subwooofer speaker which has the rating of 12 ohms and 8 watts printed on it. I wanna make a nice sound system for home use. I'm new to design a class B amplifier. Though I've done some study on class A, B and AB, I'm still...
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    how to increase efficiency of battery charger

    For achieving high efficiency you have to use SMPS. By da way, what kind of battery are you gonna charge?
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    How to connect Li-ion batteries having Multiple Ah ratings ???

    Thanx to both of you. I have another question. What is the minimum safe discharging voltage for Li-ion batteries?
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    How to connect Li-ion batteries having Multiple Ah ratings ???

    I have 3 two month used old mobile phone batteries. All of them are 3.7 volt but their Ah ratings are different. 1350mAh, 1150mAh and 1100mAh.... I wanna use them for power supply in a robotic car to achieve minimum of 10 or 11 volts... But I don't know what is the best way to connect them...
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    LC Low pass filter design for SPWM filtering

    I'll be having a 4 ohm speaker.
  18. R

    LC Low pass filter design for SPWM filtering

    Originally posted by: Hi rockeT/Scientist Well , you are going to make an audio amp . a rule is calling us , that Ftr should be at least 10 time larger than Fsine . hence 200*10=2KHZ ( at least ) but 30 KHZ is very good choice ! you'll need a half bridge arrangement with two mosfet and two...
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    LC Low pass filter design for SPWM filtering

    Hi, I've been following this thread for a long time. Discussions (specially between goldsmith and godfreyl) was most interesting.Thanks to them. However, I've learned many thing from this topic, but still there's a lot to go for. Well, the reason for I'm here, is I'm gonna make a class D audio...
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    Efficient Modualtion Formats in optical communication

    Google for "SC-kPPM". Details of this modulation technique might help you.

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