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  1. E

    555 calculation in astable mode

    Hello dear friend could you help me for designing a LED blinker with  two properties: 5 seconds LED on and 2 seconds LED off and repeat. how can i calculate space time and mark time for these R1 , R2, C1 for making 5 and 2 seconds?
  2. E

    circuit isolation

    hi i have problem with my micro controller (PIC)  board for control of camera (turn left and right). in this circuit used 7805 for making 5voltage for all component of circuit and camera (cctv work with 5v). but when turning on this circuit , av receiver can't  receive signal from camera. but...
  3. E

    lm7805 question

    hi friends please see this attachment. can you tell me why use c1 and c2 for lm7805 and why in other config we use capacitors with different values. this pictures use for pic micro controller and LCD power supply. thanks
  4. E

    2n2222 resistor value

    hi friends please show me how can i calculate resistor value  connected to base of 2n2222? thanks
  5. E

    temp. sensor ds1820

    hi can anyone know about ds1820 and how can i work for getting temperature from ds1820? any calculation need? i want to use pic micro controller and i just know more about ds1820 thanks
  6. E

    change gas sensor sensitivity

    hi friends please see this attachment. can i use potentiometer for change MQ4 sensitivity before transistor ?
  7. E

    Amplifier for ISD module

    hello friends can you suggest me a simple amplifier for amplify output of ISD1420? i need to hear the voice in the house only but i need good quality. i think 1w or 0.5w is good. thamks
  8. E

    data transmmition with laser pointer

    hi friends have you any idea for sending data (0 or 1) with laser diode to receiver diode with PIC micro controller and indicate to LCD 2*16 characterize lcd?? thanks
  9. E

    design with DAC0808

    hello friends i have question can we make a dc motor driver like 4bit  step motor with DAC808? can you suggest a circuit? thanks
  10. E

    please fined DAC0804

    hi dears friends i want to fined dac0804 but i cant it digital to analog 8 bit. i fined a site but not work. http://www.ic2ic.com/search.jsp?sSearchWord=DAC0804&q=DAC0804 thanks
  11. E

    Stepper motor control

    hi friends can you help me for driving this motor? i have motor driver work with microcontroller. i want to drive 4 wire stepper motor "AIRPAX". thanks
  12. E

    Window Car circuit

    hi friends can you help me how can i make window car circuit for more speed? thanks
  13. E

    Diode

    hi friends can you help me about these diodes i have only diodes but i dont know about these. thanks
  14. E

    c828 transistor

    hi friend i have audio amplifier made with 2 * C828. can you tell me which transistor use instead c828? thanks
  15. E

    direct connect dvd or cd ROM to TV

    hi have you any idea for connecting dvd or cd ROM to tv without PC? SATA will be complicated but how about IDE cable ? have you any interface circuit ? thanx ;)
  16. E

    high precise Temperature sensor

    Hello friends my expert friends I hope you have good day . in some months ago i made a project for sensing ambient  temperature with PIC micro controller and sensor was DS1820 and show at  2*16 character LCD. you can see scheme in this attachments. but i now looking for high precise...
  17. E

    Re: coaxial cable and GHz frequency

    sorry dear Audioguru for my demurral my LNB drawing 92.6mA in standby mode. can yo help me for designing circut that starting alarm when this current goes to zero? thanks
  18. E

    have you simple digital volume control

    hello do u have any circuit about simple digital volume control for  changing low or high with 2keys?? 
  19. E

    battery selector

    hello i want 3 or 4 battery sequent work. if no1 battery will be end no2 start and no2 will be end no3 start and .... do u have any idea?
  20. E

    insect attach

    hello can u help me for insect attacking in springtime in my room? i need good circuit for insect. do u have ?
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