Search results

  1. S

    best voltage and current regulator

    hi again we can't use more voltage here as the receiver is rated at 3.6v only.so we decided to go with parallel connection(we found a good high current battery pack).so can u show me a circuit which can flash 5(we decreased the number) LED's with appx. 0.5sec timing gap. and one more thing is...
  2. S

    3-5V DC @50mA from 230V AC without transformer

    can we glow a 3v led(@20-30ma) using above schematic. iam also looking for such circuit.it is for powering a single led.i can't use transformer as there is no enough space. i tried in groups(google) most of them look dangerous to me. is there any safe design
  3. S

    best voltage and current regulator

    u said some thing abt flasher. will it saves current.while searching for a max600 based flasher i found this http://www.laserfaq.org/sam/samschem.htm#schmsc5b what do u say abt it. and pls post ur flasher schematic too. thanks
  4. S

    best voltage and current regulator

    i got some max 660 chips (http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1140) so can we use this chip to make the circuit work for long times. like http://www.mitedu.freeserve.co.uk/Circuits/Misc/ledtorch.htm
  5. S

    best voltage and current regulator

    series means more voltage.thats why we choosed parallel connection. so is it possible to boost current?
  6. S

    best voltage and current regulator

    thanks audio guru and ANTE. u both helped me a lot thanks once again. :) i don't want to start another thread for my friends quiry.so iam posting here only. i hope u will solve his problem also. he is working on a ckt which drives 6 LED remotely.imean using a RF transmitter(35Mz) and...
  7. S

    best voltage and current regulator

    thanks for the schematic. do this ckt need any overvoltage protection.imean diode across the output.
  8. S

    best voltage and current regulator

    this looks ok to me.i'll replace R1 and R2 with 120,18Ohms resistors.(no VR1). then i think i'll get 3v output. what wattage do i need for those resistors? yes i know that.iam talking abt those maxim dc-dc converter chips.
  9. S

    best voltage and current regulator

    thanks audio guru i got it.it takes exactly the amount needed. so i'll try lm317(as amount of current used is very low.i hope chip will stay coll.but i'll still use a heatsink) on more thing abt the step down dc-dc converter.it uses(most of them) inductors.so u think this cause any effect on...
  10. S

    best voltage and current regulator

    then how can i limit the current if i use lm317 regulator. as the source current is 2.5amp and transmitter draws 20-30ma(as u said).i think current shld be limited or else it might destroy my small transmitter. 2.5amp to 30ma
  11. S

    best voltage and current regulator

    thanks ante ur too good man. one more help i needed here. iam connecting this power supply (3v 200ma from a 12v 2.5A lead acid battery) to a RF transmitter.is it ok imean as this circuit uses inductor this might effect the RF. so what is ur openion.is it ok to go with MAX724 or LT1074 or linear...
  12. S

    best voltage and current regulator

    thanks ante iam also planning to design switching regulator only.but most them are using inductors.is there any inductorless regulator.(as i want to keep it as simple as possible) and i am unable to find schematic for MAX724 iam new to these circuits. can u help me with the circuit diagram. (i...
  13. S

    best voltage and current regulator

    hello all iam trying to design a voltage regulator ckt which gives output of 3V and 500-700ma of output current. input is from a led-acid battery rated as 12v-2.5Ah on net i found below circuit which is for battery charger. circuit no-4 http://agendawiki.com/cgi-bin/aw.pl?ChargingCircuits but...
  14. S

    wireless LED circuit design

    after ur previous reply i did a small search on google for driving 4 leds using 3v dv supply.and i found one,its a voltage booster.upto here every thing is ok.but i dono how can i mix with another IR circuit(push on release off type) pls atleast guide me towars a good ckt thanks
  15. S

    wireless LED circuit design

    i dono much abt designing a hybrid circuit.i'll be thankfull if  can u make a such ckt design for me. and the LED iam using here uses 3vdc supply.(i used 2 AA cells to test them).i'll use MAX 4 LED's in series. so can u make a design for me. i'll be waiting for ur reply. thanks
  16. S

    wireless LED circuit design

    amazing.thanks for ur fast reply. now i'll explain u in detail.as i said i want to drive 4 normal bright LED's remotely. requirement:-and the ckt(receiver)shld be such that it will drive 4 normal bright LED's. when i press the transmitter button and go off when i release it. i know remote...
  17. S

    wireless LED circuit design

    hi all iam trying to design a simple wireless circuit which can drive 3-5 brigh LEDs. after a lot of search i found this circuit http://www.aaroncake.net/circuits/irremote.htm it looks simple and very compact. but as i want to drive 3-5 LED's how much power i have to use and what components do i...
View older results
Top