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  1. Sukhbinder

    IR Question

    use the equation R=(Vcc-Vled)/Iled. Vcc is ur supply voltage, Vled is the led forward voltage drop (usually 2-2.2 volts for green leds), Iled is the green led current u need (check up its data sheet for the recommended value, usually normal leds work at 2-5mA and high efficiency leds can work at...
  2. Sukhbinder

    Need 2SA514 datasheet

    thanks for the links, but there is still a problem, the FZT951 is an SMD transistor and the 2SA514 is a TO-220 style transistor, i don't think that the FZT951 can handle the current to drive a 7.2V motor in a cordless drill. maybe i'll look for a substitute in the TIP series on pnp transistors...
  3. Sukhbinder

    IR Question

    Hi vbSteve,                   wellcome to the world of electronics, its not too difficult to learn electronics, if u know some basic hardware concepts well then with ur current knowldge of C++ and VB things will be piece of cake. back to ur query, u said that u have a three terminal photodiode...
  4. Sukhbinder

    Need 2SA514 datasheet

    Hi guys, i have a cordless drill/driver (make TGF china). it uses a transistor to control the speed of the drill/driver along with the trigger control. th emore u press the trigger the faster the rpm. the transistor is a TO-220 style package with A514 written on it (which i presume is 2SA514 as...
  5. Sukhbinder

    project help with toy IC boards

    Hi mvs sarma, your are right the TDA2822M is a very versatile IC and i've seen a number of computer multimedia speaker brands in INDIA which use the TDA2822M as the main power amp. although its rated as a  1W/ch IC the speakers show a rating like 220W PMPO (this PMPO thing is all rubbish, never...
  6. Sukhbinder

    project help with toy IC boards

    i once read about the LM390 which is a low voltage high power amplifier. i have not myself used it but it may come in handy in this circuit. i've used the TDA2822M and it works well. i had made a small amp for my walkman using the TDA2822M driven from 4.5volts (3 AA batteries), well if u use...
  7. Sukhbinder

    project help with toy IC boards

    Hi guys, if u can do away with the LM386 i suggest the use of the TDA2822M. it is a 8 pin dip ic working from 1.8v to 15v and gives an output of 1W/channel ( its a sterao amp for low voltage devices). it uses minimal components and can be used in bridge mode also. here's the data sheet for it...
  8. Sukhbinder

    Peak Inverse Voltage of a rectifier

    A bridge rectifier as the same ripple factor as a full wave rectifier. however it is easier to use as it does not require a centre tapped transformer. very usefull for converting 220V AC mains to DC ( as in Switched mode power supplies)
  9. Sukhbinder

    Peak Inverse Voltage of a rectifier

    i both agree and disagree with audio guru about the advantage of a 2 diode full wave rectifier over a 4 diode bridge. a 2 diode rectifier does have a lower forward volatge drop but the diodes must have a higher PIV rating. lets say we have a 60v ac input. in a 2 diode full wave rectifier we need...
  10. Sukhbinder

    FM receiver circuit

    Thanks for you help audioguru. i happened to have a chinese made FM mic with receiver and found the receiver using the CXA1191. the mic is copy of the FM mic made by philips. i'll check out if the CXA1191 is available easily or not
  11. Sukhbinder

    FM receiver circuit

    Hi to all, hey mvs sarma i asked for a FM receiver circuit and not a FM transmitter. you are right audio guru these ics went out long ago. any ideas about ics using FFL system for tuning. i found a few like CXA1191,KA22429,TDA7000 and TDA7088. any suggestions which will be the better choice. ???
  12. Sukhbinder

    FM receiver circuit

    Hi guys, i'm looking for a FM receiver circuit for use with cordless microphones. any normal Fm receiver serves the purpose well but i need a dedicated receiver for my FM Mic. could any suggest any circuit with minimal components ( at least the indictors should be the least as they are the most...
  13. Sukhbinder

    Siemens S4 mobile service manual

    Anyone got info on the Siemens S4 mobile. I want to know which chip was used to send different square waves for different ringtones. thanks
  14. Sukhbinder

    Care for Lead acid batteries

    thanks for your help guys, i think i'll stick to the deionised water as we have a deioniser system set up at our research lab so it will be easy for me to procure it. My inverter uses an SMPS based battery charger and is a Fuzzy logic based charger system. it has options of Normal charge at...
  15. Sukhbinder

    Care for Lead acid batteries

    i just got an inverter installed. its a 800 VA system with a pure sine wave output and runs on a 12V 190Ah lead acid battery. i know that the electrolyte level has to be topped up each 2-4 months in the battery, i want to know that when adding water to the battery should i use distilled water or...
  16. Sukhbinder

    EPSON EPM-4207 motor wiring connections

    thanks for your help hotwaterwizard, but these colours just don't seem to tally with my bipolar motor. my motor has 6 wires in 2 groups. one group has a brown,red and awhite wire, and the other has a brown,orange and a Blue wire. any guesses for this? the numbers at the back of the motor are...
  17. Sukhbinder

    EPSON EPM-4207 motor wiring connections

    i was able to find the two coils but i still can't make out which is A and A' and which is B and B'. i still need the colour code. i found that this motor is used in an epson EX1000 printer. maybe someone has its datasheet or the printer servcice manual ca help me out. the numbers at the back of...
  18. Sukhbinder

    EPSON EPM-4207 motor wiring connections

    thanks for the information :D. i'll check out the motor and post the results, maybe some one else may need it just in case. ;)
  19. Sukhbinder

    EPSON EPM-4207 motor wiring connections

    thanks for the data sheets. any idea about the stepper motor connections ???. is there any way i can find them myself by following some procedure? thanx
  20. Sukhbinder

    L298n IC socket, urgent!!!

    the ic is meant to be soldered on a PCB and not mounted on using a socket. if u are dealing with high currents use a good heatsink with it. this ic is a stepper motor driver ic or in simple ways a power device.
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