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Recent content by jayanthyk192

  1. J

    LM1084 overheating at just 250mA

    I took my chances and already bought one. If it doesn't work, I'll redesign the circuit.
  2. J

    LM1084 overheating at just 250mA

    Wow, that is one really big reply and a helpful one. Thank you. I'll change the batteries on my Multimeter and check. Any way audioguru's suggestion seems to be better off for now. It hardly heats up since its PWM switched regulator. Anyway, thank you for the advice. That's exactly what I was...
  3. J

    LM1084 overheating at just 250mA

    Haha, true. My fingers say really hot.:grin:
  4. J

    LM1084 overheating at just 250mA

    Initially It'll be cool. But then after a minute or so it gets extremely hot. I'm sorry I dont have a high temperature sensor and talking in terms of "really hot" is bad.
  5. J

    LM1084 overheating at just 250mA

    I dont think my case is "unsinking" I have a sink and the room temperature will be around 22. ANd what 220 are you referring to? Yeah, that is awful. That image appears in top of the search. Anyway, I'll just connect this to my Raspberry Pi (possible only on Monday) and see what happens...
  6. J

    LM1084 overheating at just 250mA

    I am using a 10uF electrolytic one. I just tried the same circuit with a 7805 and the same happened. Overheating! I googled "7805 cell phone charger" and found a bunch of circuits. All of them use a 2ohm resistor. Is this the blunder I was making? Thank you for the document. I didn't calculate...
  7. J

    LM1084 overheating at just 250mA

    I had once tried an LM7805 with my phone and it worked without heating, even without a heat sink. I though this would have lower voltage drop and consequently lower heat and temperature, atleast for small current. I now tried with a new IC, but the same happens. I even added a 100uF cap, without...
  8. J

    LM1084 overheating at just 250mA

    Not as a charger. I need it to run my Raspberry Pi. I wanted to just try it on my cellphone. I don know why:-D. But then the overheating's happening.
  9. J

    LM1084 overheating at just 250mA

    I wanted to just check if the 5V was proper. I measured it and just connected it to my phone. The voltage was still 5V. Current at 250mA. The heat sink was in air. It was hot enough for me not able to hold the sink for more than 2 seconds. I'm not sure about the temperature. But at 250mA, I dont...
  10. J

    Computer power supply

    You can. But not directly. You'll need a current regulator to charge the battery within the maximum charging current.
  11. J

    LM1084 overheating at just 250mA

    Hi all, I needed a 5V-3A regulator. So, I bought myself an LM1084. I built the simple circuit(attached). I measured the output voltage and found it to be 5V. I connected this to my cell phone to test and the IC started heating up badly. I measured the current and found it to be around 250mA. I...
  12. J

    lpc2148 code not executing

    I burnt the microcontroller :sad:. I was trying to reconnect wires and i let one of the pins touch a 5V rail. I ended up burning the microcontroller. I'll get back if there are any problems in the new one i"m buying today.
  13. J

    lpc2148 code not executing

    this is the code: #include<lpc21XX.h> int main() { IODIR0 = 0XFFFFFFFF; IODIR1 = 0XFFFFFFFF; while(1) { IOSET1 = 0XFFFFFFFF; IOSET0 = 0XFFFFFFFF; IOCLR1 = 0XFFFFFFFF; IOCLR0 = 0XFFFFFFFF; } }
  14. J

    lpc2148 code not executing

    Hi, I starting to work with LPC2148 MCU. I bought a daughter board with the IC in it. It has the crystal connected, Vss and Vdd supplied with proper voltages. I added a 12k to reset and pulled it up. I used a 12k at PO.14 and pulled it up. I'm able to burn the flash, but the code is not...
  15. J

    AVR usbisp stops working after i power the microcontroller

    I'm sorry, I forgot to update the thread. I tried it with a battery and it worked fine. So I added a switch inbetween the SMPS power line and MC. Now it's working fine. I even noticed that the usbasp goes into high impedance or input mode as any good programmer should. So I think the SMPS was...

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