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  1. Sukhbinder

    power on reset for digital circuits

    H there all of u! i need a circuit to perform a power on reset for digital ics. i need something that is small ans simple using only simple discreet components like resistors,capacitors and transistor. no special ics please. the ic is a better choice but procuring it for me is a bit tricky here...
  2. Sukhbinder

    TIL 31A datasheet

    Thanks
  3. Sukhbinder

    TIL 31A datasheet

    Any one having the datasheet for the TIL 31A phototransistor from texas instruments. thanks ;)
  4. Sukhbinder

    Nokia 3650 & 6230i service manual

    need a nokia 3650 and 6230i service manual ;)
  5. Sukhbinder

    Need help solving problem on daughter's schience project.

    why not try to power the digital clock from the power supply of the spindle motor. However the clock must be able to save the time just before it shuts off. u can try to use the signal at the spindle motor to trigger the counting of the digital clock (not the clock signal). generally most CD...
  6. Sukhbinder

    finding the capacity of NiCd or NiMH cells?

    Thanks for all your  suggestions guys.
  7. Sukhbinder

    finding the capacity of NiCd or NiMH cells?

    How do u measure the capacity with a discharge resistor and timer circuit. is it like this that u fix a discharge current value using a resistor and and find the time for which the cell can supply the current. u surely need high wattage resistors for it but what should the approximate range for...
  8. Sukhbinder

    finding the capacity of NiCd or NiMH cells?

    Thanks for the information but could u still provide me with a method to find the capacity of such type of cells. I need it to check out my cells. something that indicates its charge remaining and life remaing and condition.
  9. Sukhbinder

    reaserch for my final project

    hello kbe,                 i would like to kow that what kind of C-V measurements are u doing, i mean we have a C-V measurement unit in out lab but it measures the capacitance -voltage  for MOS devices. u can use it for p-n junctions also. u also have the C-V measurements as the current voltage...
  10. Sukhbinder

    Ultrasonic cleaner

    Hi phil7, u can get quite a lot of  information about ultasinic cleaners on google. the basic theory  is that a piezo transducer is applied with a high frequency ( 30kHz-55kHz, that is why the word ultrasonics) signal. the piezo element vibrates with the applied frequency and these are coupled...
  11. Sukhbinder

    finding the capacity of NiCd or NiMH cells?

    thanks for the suggestions, if i don't get NiCd cells then i think NiMH cells will replace the NiCd cells well. i'll try to find the best fitting cells for it so that i can get maximum current also from them.
  12. Sukhbinder

    Making LEDs turn on at a certain resistance

    Try the character map utility in sytem tolls in windows with the symbol font. u'll get all the greek letter sybmols. just select one and click copy to copy to clipboard and paste it where u need it like this W. if u get a W written then just select it and change its font to Symbol. The Symbol...
  13. Sukhbinder

    finding the capacity of NiCd or NiMH cells?

    Hi guys can any one tell me a way to find the current capacity for NiCd or NiMH cells. Usually its written on the cell itself but if u need to replace an internal customised cell , how do u do it. i have a black and decker 2.4V cordless screwdriver. the problem is that we donot have a...
  14. Sukhbinder

    need help with transistor 502

    thanks for ur help, i finally found that the transistor was a TIP42C, the number was covered with black ink. It uses a TOP222Y offline PWM switch in the power supply.i checked its datasheet which says its a 15-25W power device. can it provide enougt power to quick charge 4 2300mAh NiMH cells. i...
  15. Sukhbinder

    need help with transistor 502

    i'm having some problems with my sony NiMH charger. the charger has a TO-220 package transistor with the number 502 on it. i cannot find out if it is a BJT or a MOSFET. its a fairchild  make i think but could not find anything on the fairchild website. can any one help me with this and get me...
  16. Sukhbinder

    car + mp3 + powersupply + noise HELP!

    Glad to help u fenris. i have a USB MP3 player which is made in taiwan. it has a backlit LCD display which changes colour using a blue, red, and green leds. Mine has a built in lithium ion battery which can be charged from USB port of any computer or an iPod type travel charger. the later...
  17. Sukhbinder

    car + mp3 + powersupply + noise HELP!

    Hi fenris, i would like to know that are u using a USB type MP3 player. Keep in mind that most such players donot have the audio output ground and power supply ground as the same. In such USB type of MP3 players the voltage from a 1.5 volt battery is stepped up by a DC/DC converter. If it has...
  18. Sukhbinder

    UV currency checker/exposure unit

    i need the layout for a UV currency checker or a lithography UV exposure unit. We require a UV exposure unit for exposing resist coated PCBS at our university. We had a mercury lamp earlier but it was too slow (took 1.5 hrs for correct exposure) we changed the lamp by the supplier gave us a sun...
  19. Sukhbinder

    Magnetic Induction charged Torch

    Same was the case with me Ldanielrosa. i found two lithium coin cells in mine. There was coil in it but it was not connected and for the magnet they just put in a metal stud. these cheats... they sure dupe the customers well. >:(
  20. Sukhbinder

    Magnetic Induction charged Torch

    sorry guys the working time is 5 mins as per this site but i remember seeing 15 min at some other site. u need to shake it for 15-30 sec and u get a working time of 5 mins.:D
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