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  • Users: biomedicalEng
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  1. biomedicalEng

    component replacement specifications

    try www.icmaster.com
  2. biomedicalEng

    using a volt meter to measure duty cycle

    ...| | | | __V2__| <-t1-> <-t2-> Due to above values and asume that VDC is the displayed value on the volt meter, we have: VDC=((V1*t1)+(V2*t2)/(t1+t2)) if V2=0 then VDC=V1 * t1/(t1+t2) where t1/(t1+t2)=Duty Cycle Hence: Duty Cycle= VDC/V1 and Duty Cycle% = (VDC/V1) *100...
  3. biomedicalEng

    iNSTRUMENT GROUNDING - 50Hz noise

    take a look at: Art of electronics by paul horowitz it's a really nice book and also contains some helpful informations about grounding considerations and low noise devices.
  4. biomedicalEng

    Switch Debounce

    you can also use S-R latchs which are very inexpensive and 6 of them are integrated in a single chip and also most of the semiconductor making factories have these chips. S-R latchs are great for debouncing a push button!
  5. biomedicalEng

    Microcontroller choice

    Hi National Semiconductor has a very powerfull Microcontroller with A/D, D/A, PWM, CTCs, SPI, UART and ... peripherals (Sorry i forgot it's number!). you can also use ATmega Microcontrollers of Atmel corporation. and at last take a look at Microchip, they have very nice and high efficient MCUs.
  6. biomedicalEng

    Alternative for LCD Ampire AT240160BFIEW

    Hi Take a look at Xiamen ocular's site. It's a chinese company which produces low cost LCD displays. You might find your desired LCD!
  7. biomedicalEng

    time delay circuit/component

    You can use a monostable circuit to generate your required delay.
  8. biomedicalEng

    Infrared learner

    Most TV remote controllers send a conventional number of pulses to IR emitter diode in a known amount of time, to send a command to TV. For exmaple to send ON command, you can send 10 pulses in 2 milliseconds! Ofcourse these numbers vary on different types of remote controllers. But, I didn't...
  9. biomedicalEng

    Switching 35V, 500 mA with digital output?

    Hi, Try Texas Instrument's ULN2003. It can satisfy all of your requirements in a very low cost. BR, Kasra email: Kasra_Ravanbakhsh@hotmail.com
  10. biomedicalEng

    Need a 0 to 5VDC Analog Isolation Circuit

    try Analog devices AD202, it can do, what exactly you want. but the only problem is it's cost, it's a lil bit expensive. the another way s using linear opto couplers such as CP Clare's LIA100, they send 2 or 3 samples of their ICs if you want. I think HP no longer produces any semiconductor...
  11. biomedicalEng

    Infrared learner

    what do you mean by Infrared &quot;learner&quot;? do you want linear analog opto isolator? or maybe you meant an IR remote controller?
  12. biomedicalEng

    what is the use of using opamp in photodiode circuit?

    Hello liu93083, Photodiode generates a small current proportional to amount of light which is directed at it's face! This current is very small, usually in range of micro amperes, so if we want to show amount of light in a screen whether digitally or even analog then we have to first change...
  13. biomedicalEng

    measuring frequency

    ...low ripple, full input protection in two versions (LM2907-8, LM2917-8) and its output swings to ground for a zero frequency input. Advantages: * Output swings to ground for zero frequency input * Easy to use; VOUT = fIN * VCC * R1 * C1 * Only one RC network provides frequency doubling *...
  14. biomedicalEng

    Measuring Resistance 0 -100 Ohm

    there is an IC that provides everything you want! national semiconductor's LM3915: The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. One pin changes the...
  15. biomedicalEng

    relay to control appliance power on/off

    hi use ULN2003 to drive relay from a digital circuit like a microcontroller or even you can use a single transistor. you can see ULN2003's data sheet on www.ti.com
  16. biomedicalEng

    astable ajustable timer to pulse 30 secs to 5 mins question

    555 can handle your purpose. in astable configuration the pulse period is equal to T=.693*C*(2Ra+Rb) where Ra is resistor between pin number 6 and 7 and Rb is resistor between pin number 7 and 8 or Vcc (+5) high time=.693*C*(Ra+Rb) low time =.693*C*Ra you can make very large duty cycle with...
  17. biomedicalEng

    analog integrator

    OP07 is a very low offset op-amp .it's offset is in range of microvolts.I think it's suitable for your purpose
  18. biomedicalEng

    Looking for inexpensive power supply with &gt;70¦C operating temp.

    Hi why you think 80 C is a high temperature for a power supply circuit when a approximately 20 watt none switching power supply works it's temperature rises about 150 c ! you want a 24 V DC 50 watt power supply and if you don't want to waste your money you must make it by urself now i'll guide...
  19. biomedicalEng

    comparitor stability

    you must use a schmitt trigger to have a stable comparator by using positive fidback. if you dunno what is a schmitt trigger you can contact me by this email address: kasra_ravanbakhsh@hotmail.com or see any electronic books!!!! such as Integrated Electronics by Millman-Halkias McGraw-Hill...
  20. biomedicalEng

    Analogue Mulitiplier

    ...anti logarithmic amplifier to make a multiplier. with just four OP-AMPs and two diods or two transistors and it's very low cost. with this theory: x*y=exp(ln(x)+ln(y)) because ln(x)+ln(y)=ln(x*y) and then exp(ln(x*y))=x*y ;) and making logarithmic and antilogarithmic amplifiers and an adder...

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