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  1. prateeksikka

    +- power supplies

    just for  a beginner : for any circui to function with reliablity except for special autotransformers, +/-5V is equivalent to 0 and 10V supply. potential difference requires no reference but a potential does. thats it. ;D
  2. prateeksikka

    Help Needed Calculating Resistance

    from this topic i used bicolor LED once in my lifetime. i guess u also remember the same.can u guess? it was in electronic stethoscope---the fuzzzzzzzzy project......
  3. prateeksikka

    Resistance wattage in series

    hi audioguru! what will be the case according to u when the resistors are in parallels? then i guess current through them being unequal and voltages being equal we would have P=P1*P2/(P1+P2) as the net power rating where P1 and P2 are the individual power ratings. am i right?
  4. prateeksikka

    Help Needed Calculating Resistance

    hi audioguru! do u really have 1.8V LEDs? i mean how do u have a voltage above 0.7V in forward bias condition?
  5. prateeksikka

    Resistance wattage in series

    hi audioguru! say we have 2 resistors with wattage P1 and P2 and connected in series. the current through them is same i=V/(R1+R2) net resistance=R1+R2 in such a case it can be written as V*V/P=V*V/P1+V*V/P2. thus 1/P=1/P1+1/P2 thus reciprocals added give reciprocal of net power.what do u say?
  6. prateeksikka

    Help Needed Calculating Resistance

    well i make it a golden rule: current in an LED should not exceed 14mA and normally 5k in series with a single LED is enough........ u can calculate it easily for any circuit...
  7. prateeksikka

    Resistance wattage in series

    i guess what bloki said is not correct. wattage of the resistors is added only when they are connected in parallels and not in series. whats the view of others?
  8. prateeksikka

    filter

    hi walid! i see no prblm in calling it as allow instead of emphasis. yes some active filters do provide some gain to the signals as is the case  with butterworth filters of high pass or low pass kinds. filters are an integral part of signal processing circuits where we want some frequencies to...
  9. prateeksikka

    Momentary Switch from Piezoelectric Transducer

    hi ardeo check out this link: http://www.imagesco.com/catalog/sensors/switch-info.html
  10. prateeksikka

    Ultrasonic cleaner

    hi dude! as far as the circuit is concerned , i cant directly help u and most of the companies manufacturing it have patents for it. Bad news! ;D
  11. prateeksikka

    NPN vs PNP choice

    hi all! Whenever we go for a design, say for an amplifier should i chose a pnp or an npn transistor (as electrons have higher mobility), negative voltages are a problem always, isnt that so?
  12. prateeksikka

    clock for ADC

    i guess u wish to have a variable frequency of the crystal to be controlled through a controller. am i right? ADC with variable frequency clock?
  13. prateeksikka

    What's a snubber capacitor, and what's it used for?

    Thank god! all s well that ends well
  14. prateeksikka

    What's a snubber capacitor, and what's it used for?

    Actually we generally use a series combination of a resistor and a capacitor which is known collectively as a snubber circuit. It protects the thyristor.I guess cap alone will not even work!
  15. prateeksikka

    electornics and communication

    u can start up with a diode in preliminary stage and use it as an AM envelope detector. go ahead good luck.No schematic at all!
  16. prateeksikka

    clock for ADC

    hi duratia! most of the ADCs have external clocks.... tell me the number of the ADC anyway.
  17. prateeksikka

    What's a snubber capacitor, and what's it used for?

    hi friend! snubber capacitors are used to protect expensive devices like thyristors against surge voltages which may appear across them in form of sudden spikes. capacitor acts as short fo high frquency and current does not flow through the device initially but increases slowly as the cap is...
  18. prateeksikka

    Antenna and TV standard

    hi audioguru! do u mean that the cable wire carries frequency multiplexed audio and video signals? i mean audio at one and video at other frequency but sharing same channel(cable wire)
  19. prateeksikka

    clock for ADC

    connection to ADC depends on Pin Diagram of the ADC u are to use. Make sure that it is well synchronized with i/p data frequency and sampling rate of ADC. Dallas Chips are most famous as ADCs...
  20. prateeksikka

    Increased voltage!

    Even i felt that ! But there could be one thing Power is same and voltage is increased at cost or reduced current. Is that possible just like a transformer.
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