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prateeksikka
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Posts posted by prateeksikka
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Are the simple FETs and BJTs which we use non linear amplifiers?
By linear do you mean Y=m*X kind of relation?
or in otherwords gain independent of input?
i think u are right gain of a single transistor amplifier depends on i/p level. -
HI AUDIOGURU!
my original question was that why dont they further shift the frequency range up and further reduce antenna height. -
hi audioguru!
we generally call opamps as linear ICs .
Do u know why is it so? -
hi there all!
can anybody tell me the logic behind fixing up 88-108 MHz as range for FM?
and why not some other range? -
So should we go for large caps specially in filters.
In all ckts i have seen they are generally the largest components.
A huge giant of a small value. It looks as a pole in a small circuit.
;D -
hi alun!
i guess it is again a debatable issue .some people 220 V dc as more dangerous than 50Hz 220 V ac because 50 Hz wave gives u 50 chances of survival in just 1 second.....how about that.
About akash's point i have ultimately concluded that it is the power i.e energy dissipated into u in 1 second which makes u die and not just voltage or current.
in short it is V*I. -
hi audioguru !
sorry for the interruption but i would say that a surge in the supply would be a more appropriate word than ripple.
Although i agree with u that a large cap has higher rating for surges. -
hi aakash!
the topic has remained same nd we are now discussing the amount of voltage u need in case there is no direct connection between u and ground. -
hi there!
There are many other e books on maths.
I remember the time during my first year when i used to study maths.
we had good fundamentals to clear on topics like linear algebra and matrices and calculus too. -
Ive heard a few kilo volts is enough to knock u down even without ground.but if grounded gosh..
60-70V will do the job.
Air's ionization potential is a few thousand volts and it can only cause u a shock if air ionizes and circuit is completed.
;D -
while the context i was talking about Laser Diodes being used as sourced of power for optical fibers...
in communication links.
;D -
for basics of differential calculus there is a book by THOMAS and FINNEY and another book
by ERWIN KREYSZIG for fundamental concepts in engineering maths. -
hi audioguru!
can u tell me in general is it more advantageous to have a high frequency communication system or a low frequency system.
Was there any logic behind assigning 88-108MHz as frequency for FM communication or was it just random? -
hi audioguru!
i think your son must have touched ground. is it possible for the mid air to ionize at mere 120V and cause breakdown(fee movement of charges!) ?
i dont think so....................
;D -
hi audioguru!
i guess nowadays we hardly use LEDs with the invent of laser diodes even in optical fibers
;D -
hi audioguru!
the only thing i meant by my question was that in general what are the disadvantages of high frequency communications?
i.e we use some MHz range for FM and few kHz range for AM radios.
any reason for not going in GHz.
is noise effecting more at those high frequencies?
or something else?
;D -
hi audioguru!
but consider the fact that height of antenna would be so small at these high frequencies.
carry an FM receiver in ur pocket.
By the way what is the loss at using microwaves for FM broadcast. only advantages i can see.
any disadvantages u can think of? -
hi there!
clock is nothing but just a multivibrator ckt or an oscilator..
u must have studied transistors -
suppose u want an alarm at intervals of one hour clk of 1 second will do and counter will increment after 60 sec reset the counter to say count n when comparator and N are same bulb can be made to glow.
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no the program need not be changes
u can use a 74154 or any other of its substitute to act as a 2 to 4 line decoder.
u told u already have 2 pic outputs,u can pass these o/ps to 2 to 4 decoder and 4 o/ps will go to 4 digits. as simple as that!!! -
hi there!
have u thought of any sensors or transducers which u are going to use for this project? -
hi all!
isnt it the case that if we use FM or AM broadcasts at GHz frequencies we would be using an antenna of at the mosr few cms in length.
why dont we then go for radio broadcasts at these low frequencies?
any problem at high frequency communications? -
hi shekar!
can u be a bit more elaborate on what datawidth is?
how is it one for serial communiacation?
what is the significance of shannons theorem
like c=bw*log(symbols)?
thanks in advance -
hi there!
modulation index and deviation are interchangable.
if i/p signal varies between 1 and 2 V,to what extent do we vary the frequency is in our hand.
hence in our own hand.
;D
basics of electrical supply
in Theory articles
Posted
hi alun!
also the skin effect also dominates at very high frequencies and does not damage the inner organs.
(considering body to be perfect conductor)...
;D