Recent content by smartsarath2003

  1. smartsarath2003

    Design of PC Speaker

    Do you mean connect the tweeter,1uf cap in parallel with the main speaker
  2. smartsarath2003

    Design of PC Speaker

    Hello, I want to design a simple PC speaker, probably less than 5W. The only building blocks I have in mind is a basic pre-amplifier with op-amp and a ClassAB power amplifier that will drive a 8ohm,6W speaker. But My problem is where should I have the volume control. Is it during the...
  3. smartsarath2003

    Temp. Compensation for linear power supply

    Hai, I used a 10uf cap between ADj and GND. I still have the last digt of my meter gowing down, but is const after few seconds. its actually going down after conncting load then going up a bit and then slowly going down. The first bit is some thing to do with regulation, But didn't understand...
  4. smartsarath2003

    Temp. Compensation for linear power supply

    Hello, I built a small power supply with LM338 regulator. The problem I am facing is the output voltage going down slowly when i leave the load ON. Is this happening because of temp. I connected a load of 220R at 24V output, so it not too much current actually. Does anyone have anyidea why is...
  5. smartsarath2003

    Led display Digital Voltmeter question

    Hai, Can any one explain the function of pins27,28,29 on ICL7107. Also I still didn't get clue why the pin7, which was said catode-A is shown linked to ground in the main schematic ???. Is it supposed to be pin5(cathode-dp) for required decimal pt. Also How does the ref-hi(pin36) effects final...
  6. smartsarath2003

    Help with simple RF switching application

    The problem with IR is distance between PC and Lamp and also direct contact. They will be at upto or more than 1meter. The lamp is AC and I am intended to use high current relay. I don't know what RF frequency to use or any thing abt it. All I need is either the relay ON/Off when there is...
  7. smartsarath2003

    Help with simple RF switching application

    Hai, I need some help regarding wireless switching application. I want to control a lamp from my PC using RF link. I have a block diagramatic idea regarding this. PCserial port -->RF transmitter --->RF receiver --> Control Ckt But the problem is all these bulinding blocks are very new...
  8. smartsarath2003

    AAA Battery Charger

  9. smartsarath2003

    AAA Battery Charger

    Hai, I decided to use temparature sensing to check battery is charged or not after reading energiser manual for NiMh and said thats mostly same for NiCd as well. The document is avilable at http://data.energizer.com/PDFs/nickelmetalhydride_appman.pdf They boasted that temp sensing is better and...
  10. smartsarath2003

    AAA Battery Charger

    Hai, here is my simple pulse charger. Applies 125mA charge for approximately 500mSec and no charge for 100mSec. But still to include disconnecting ckt after complete charge. I am thinking of using a thermister, to see the battery is hot enough or not and then disconnecting the charging ckt. But...
  11. smartsarath2003

    AAA Battery Charger

    Hai, Thanks for the reply By making the charger,Iam trying to learn things. So I want to start from basics, rather than using integrated IC's..... Any ideas
  12. smartsarath2003

    AAA Battery Charger

    I also want to implement a cycle Charge-rest-discharge-rest-charge I red somwhere that this(pulse-charge) will be good method ratherthan continuous charging. The discharge cycle involves sensing the voltage of the battery by connecting a load thus by finding the battery is fully charged/not...
  13. smartsarath2003

    AAA Battery Charger

    Hai, I want to make a small AAA battery charger. I have an idea about a const current charger using LM317. So far I decided to use a LM317 and a 555 timer . Could any one please let me know any ideas without using microcontrollers. ::) Thanks
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