Issacsutt

modified 7 years ago

High Frequency Square Wave Oscillator

131

01:35:26

Oscillates at around 100KHz

*flip the switch to start the oscillations*

Edit:  forgot to trace the square wave signal, it is in green

published 7 years ago

hurz

7 years ago

What is the digital part for? Check this http://everycircuit.com/circuit/5371050237100032

Issacsutt

7 years ago

To convert the sine wave to a square one

Issacsutt

7 years ago

So a comparator would be more effictive?

hurz

7 years ago

You can put a comparator into the loop. However, i dont see a good reason, a single transistor provides much enough loop gain to oscillate. Your digital part is form logic point of view doing nothing 0 = 0 and 1 = 1 but from analoge it does make a lot gain which can be done in many or even endless digital gates and flipflop combinations.

hurz

7 years ago

Check this. Let the oscillator do its job and phaseout a signal to a comparator to get a nice digital signal. http://everycircuit.com/circuit/5371050237100032

Issacsutt

7 years ago

Ok thanks.

Issacsutt

7 years ago

Also, is there such a thing as a frequency regulator, where it could take a higher frequency, and slow it down to maintain a lower frequency, rather than trying to build an oscillator with very specific component values to obtain that specific frequency?

hurz

7 years ago

You have read something about PLLs, right?

jason9

7 years ago

You could build a digital frequency divider and then convert that to a sine wave with an LC low-pass filter to filter out the harmonics.

Issacsutt

7 years ago

PLL?... I don't think so

Issacsutt

7 years ago

Yeah, that's the only way I know of, but doing it that way means your stuck having to divide it multiple times into multiple frequencies, when you may really only need one, maybe two in the future.... I was hoping there might be another way, to maybe kind of just clip the frequency or something, but it might even be as simple as a filter... I don't know

jason9

7 years ago

The only way I know how to make a frequency divider just divides the frequency by some integer. This is almost exclusively done with logic gates as the part that determines by what number the frequency is divided. Either that, or you could use a frequency subtracter to find the difference between two frequencies, but that requires a second free-running oscillator.

Issacsutt

7 years ago

No flip flops?

jason9

7 years ago

Flip flops are made of logic gates.

Issacsutt

7 years ago

I know

jason9

7 years ago

I’m saying that the only way I know how to make frequency dividers is with logic gates. Flip-flops count, so they might be used. In fact, I’d use them if I had to design a frequency divider. Especially the JK flip-flop, especially if I’m dividing it by a power of two.

Issacsutt

7 years ago

Mmm ok

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