Recent content by antoker

Well, here we have a oscillator, where collector resistance was replaced by L2&C3 to improve the oscillation by removing some harmonics, by adjusting tank circuit-values, better filtering can be achieved (Note: just made it in two minutes or so, didn't really calculate any values). Now I can...

Averagesupernova: I think you misunderstood me, when I was talking about oscillator as a BP-filter, what intended to say was: Since, oscillators tend to produce more harmonics, tank circuits are introduced on collector side of transistor in order to clean up the signal. How much noise are we...

what: are you sure about 360? ;) You're required to get a 180 degree phase shift in your feedback loop in order to be able to sustain oscillation at a particular frequency. Start up kick is not produced by a noise, but by an initial transition between zero volts and up to a Vcc level(resulting...

Berkeman is right, much easier to use 555 and those "schematics" from the net usually never work, since they are put together by amateurs, not engineers.

Well, i missed k with M, sorry about that.

well, 100Mhz rate is not that high, a lot of circuits can handle those speeds. Just be sure to check specs for the components before u start building. So you know that they are capable of operating at such frequencies. Are you planning to use transistors in your design? HS switching transistors...

I think someone has already asked a similar question. I just can't find this thread again. The approach is like this: -Define specifications of you scope Bandwidth, Sampling Rate Input impedance, Attenuator/Amplifier stage Power supply (dual or single) Since you want to start with a...

damn... you're right ;)

Use the fact that your expression can be expressed as \int{\frac{f(t)}{g(t)}dx}, where f(t) = e^{-j\omega t}, g(t)=1+4t^{2} and proceed as stated by the rule. If i remember it correctly it goes something like \frac{f'(t)g(t)-g'(t)f(t)}{g(t)^{2}}

I think that everyone is capable of reading fonts in normal size ;) Homework questions should be posted in homework section. Before asking for help we'll need you to show, what were your attempts at a solution.

I'll second to that, s-domain (laplace) will make your life much more easier ;) Neo, are you a mind-reader or something, was about to say about Cramer's rule as well :biggrin:

I've been using several sims, but it seems that orCAD is the best. But if you prefer writing your own netlists, try any of spice variants ;)

That's looks like an frequency/amplitude shift keying scheme to me. The answer depends on what you're modulating, are you modulating an amplitude of the carrier, or are you modulating a frequency? Only carrier present, will result in one spike on a spectrum analyzer at the carriers frequency...

Pretty good explanation about FM is done http://www.fas.org/man/dod-101/navy/docs/es310/FM.htm". Hmm, all your questions are arising from not knowing how fm is created. You can actually get all the info from deriving equations. Just start with some carrier frequency f(\omega (t)) = A\cdot...

I'm aware of the points you stated, but I just wanted to explain that you don't need to use hi-Z configuration having a Lo-Z input, when you already have a nice low-Z config to use. "hmm.. still thinking of impedance matching :biggrin: "