Oscillator I

http://everycircuit.com/circuit/6683372842909696

I’ve never seen anything like that before. Maybe you made an entirely new type of oscillator! Or maybe it’s some kind of negative resistance oscillator. If it is, it sure is an interesting but strange one. It also seems to be rather unstable.

Ohh, cool haha

Is negative resistance where the signal strengthens accrost it rather than decreasing?

"Keep it simple", Shake to start http://everycircuit.com/circuit/4681686188294144

@hurz, your oscillator is completely different. That LC network was definitely not a “nonessential component”. Your oscillator oscillates around the 1uF capacitor in between the two transistors resulting in oscillations at ~200Hz while this oscillator is based around the LC network resulting in oscillations at ~2kHz. Big difference!.

Also, your version can’t oscillate at 12V, but only 5V, while his can oscillate at either 12V or 5V.

Mr Clever, tell us more

I just reduced it into one possible direction. There are more possible ways to endup much more simple then what it is now. BTW, 5 or 12V is caused by the stupid transistor biasing which was choosen here with 1k/178Ohm holy shit what a combination 💩. And holy shit who would try with this bias to run a circuit at 12V. LOL

"Keep it simple" shake to start http://everycircuit.com/circuit/6429898301505536

Hurz, you got rid of the LC circuit like Jason pointed out, but I think I see what you did... I believe you just cascaded two inverters with a single capacitor that phase shifts it a little more while buffering the signal before it. Very nice, but I was thinking more along the lines of amplifying the natural oscillations if a tank circuit. Like you said about the voltage divider, just to control the peak of the oscillations, and thus is more suitable for operating at a specific voltage right?

Saw your second "simplified circuit", matches just what I was trying to accomplish with less components, but I almost never build any of my circuits with OP Amps because I don't have one, and I think of it as a cheap short cut, and "ideal" but not "practical". Though, I've never used one before, only simulated, so I don't know if its too good to be true or not (that's just how it appears to me), so I usually just avoid them all together in my schematics cause I can't build it anyhow.

Can you post just one more without the OP Amp, but with the LC though?

Yeah, that last one with the OP-amp definitely works the same way and is a clear negative resistance oscillator.

Check out my newest oscillator. It’s very simple and I think it may be some form of negative resistance like this one is. However, it uses a transformer, so it may not be what your looking for.

Ok thanks, I'll check it out

Yeah it looks really good, I agree with the bugger on adding something like a resistor or two to protect the transistor... I might be able to breadboard it though, but I'd have to wind my own transformer, which I've never done before, and I've read its apparently a lot more difficult than it may seem.

In addition to having the right amount of coils on the primary and secondary, you have to account for magnetic flux and eddy currents, but also impedance of mainly the primary winding, otherwise it could overheat, melt the wire, and behave more like a short.

Both oscillators I posted based on your original I just removed some components. Your original is a wild mix of anything you guys saw in the context of oscillators. And for sure it will do crazy things.

I was just thinking of amplifying the natural oscillations of a single LC Tank circuit to promote proper feedback, I was trying to use a transistor to amplify it without putting it out of phase, so I used two transistors to get 360°, but the oscillations of that tank circuit were so small in magnitude of voltage that it would never be able to bias a transistor all by itself, so I added the voltage divider to keep it biased just enough to stay mid-way of the voltage source (should be approx. 2.5V) so that it could have enough room to swing high and low of that mid-way voltage point while it oscillates. But then I ran into the problem of the transistor loading down too much on the signal of the tank circuit, so I added a capacitor to buffer the signal at the tank circuit and between the two transistors. Then finally, I adjusted some values till it began oscillating. Thats how I thought of it, and came up with the circuit... please, if you don't mind hurz and/or Jason, post one of how you would've accomplish the same in that way. Then I can see how you think it should be done and possibly learn from it that way.

issacsutt, this is exactly what I did. The original "oscillator" is a mess, I hope you agree. I have splitted the mess into two basic types of oscillators. If you do not understand the basics how can you design a combination of both basic concepts?

Hurz, I understand both of your oscillators, I just don't like the OP AMP in the second one, because its not something I could build in reality with the components I have on hand. I was just asking if you could replace the OP AMP with another circuit and still yeild just as good of results to what you accomplished with the famous OP AMP, so I could see how you chose to do such. I do agree, my version is messy, it even shows that with the oscillations it's producing, but I'm not entirely clueless to all of this either, I'm trying to master it, but that takes some time, I'm sure you've been doing this all your life, probably 50+ years, am I right?

Buy an OpAmp or take one out of an existing circuit. Im pretty sure you have plenty of them around you. Open your eyes!

Maybe... just maybe