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Recent content by simonwai999

  1. S

    Why do LEDs blink every 32 seconds in PIC16f1827 with internal oscillator at 500kHz?

    Re: 16f1827 internal osc hi upand, Thanks. I set the frequency in my project you are right. Your answer has cleared my doubts.
  2. S

    Why do LEDs blink every 32 seconds in PIC16f1827 with internal oscillator at 500kHz?

    Re: 16f1827 internal osc /* * Project name: LED_Blinking (Simple 'Hello World' project) * Copyright: (c) Mikroelektronika, 2009. * Revision History: 20080930: - initial release; - 20090720 - modified by Slavisa Zlatanovic; * Description: This is a simple...
  3. S

    Why do LEDs blink every 32 seconds in PIC16f1827 with internal oscillator at 500kHz?

    Hi all, I am using 16f1827 with the default internal osc at 500khz. In a simple led blinking programme, the leds blink every 32 seconds. I am confused. 500k/4? F=1/ T T = 1/ F If I want to find out why it takes the leds to blink every 32 seconds with this frequency, what should i do...
  4. S

    Suggest me a LM741 opamp replacement

    lm 3140 HI i just wanna try out some simple circuits from the web:) regards
  5. S

    Suggest me a LM741 opamp replacement

    lm741 replacing hi thanks so i got what i needed cool! regards
  6. S

    Suggest me a LM741 opamp replacement

    lm741 russian hi today i tried again and found this ST UA741CN General Purpose Single Operational Amplifier i do not know if it is 741 or it is 741 with diff version? Thanks regards
  7. S

    When do we need to balance out the input offsets?

    balance input offset current hi folks thanks for ur replies cool regards
  8. S

    When do we need to balance out the input offsets?

    hi folks i recently looked at op amps something about offset null i do not quite understand here is a piece of article from the net "we learned that there are at least three basic limitations on the accuracy of an op amp circuit: the tolerance of the resistors, input offset voltage and...
  9. S

    Suggest me a LM741 opamp replacement

    replacement for lm741 hi thanks :) i will look for them soon cool regards
  10. S

    Suggest me a LM741 opamp replacement

    hi folks i saw many circuits i would like to try out with LM741 but unfortunately in my city i could not find this IC i was wondering if there are similar op amp to replace it thanks
  11. S

    power transformer current

    hi pal thanks for following up :) i got what you meant cool cheers Added after 52 minutes: hi about the NTC thermistor is it correct to connect it in the drawing ? thanks
  12. S

    power transformer current

    hi all thank you very much i must say i have learned a lot from you guys and i understand it now regards
  13. S

    power transformer current

    hi fvm thanks but would you kindly tell me how u got all these figures? how did u calculate it? if the unregulated voltage is required to have a lower ripple. 10000 uF means about 0.8 Vss ripple at 1 A DC load with a 9V transformer, 2200 uF means somewhat below 2.5 Vss, leaving minimal...
  14. S

    power transformer current

    hi in the drawing ?700 uf i actually cannot see the first digit of this cap value 4700uf for this power supply hmmmmmmmm hope the guy who drew this will reply us regards
  15. S

    power transformer current

    hi pal :) very clear drawing thanks a lot regards
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