Circuit Help: I need help making sure this circuit will work before I build it?
The other day I bought the iCircuit app for my iPad and was fiddling around with it. I was attempting to design a circuit to...I really can't remember. Anyhow, I screwed it up, but in the process, made this (See picture). It says it should turn on and off/sine wave type waveform at 7.34Hz roughly. I wanted to know if, because I screwed up what I was making, if this is just screwing up the physics of the app, or if that is actually the way it would function. I will upload a video of what the app is doing. If this actually works as it shows, well then, best screw up ever! :D
Appreciate the help!
Here is the video of the app as its going, and yes, I have the app set at a different time interval, that is why 7.34Hz waveform looks ridiculously slow, that isn't the problem:
18
answers
|
Answer it!
|
sort by:
active |
newest |
oldest
Here's what I think you're asking: "Can I make an oscillator from these parts?"
Yes. Anytime you combine L (inductance) and C (capacitance), you get some resonance. In fact, you could make one with fewer components. Look up the basic types--colpitts, hartley, clapp, relaxation, etc.
(The challenge in electronic design is often preventing oscillation, not creating it...)
Yes. Anytime you combine L (inductance) and C (capacitance), you get some resonance. In fact, you could make one with fewer components. Look up the basic types--colpitts, hartley, clapp, relaxation, etc.
(The challenge in electronic design is often preventing oscillation, not creating it...)
May 27, 2011. 9:21 AMWesley666 (author)
says:
Ok, thank you. As for preventing it, I like creating it! I find it harder to create oscillation then eliminating it. Thanks for the help and I will definitely look up the others you listed.
The 2N3906 has no resistor on the base, that's can't be good.
And here does the signal input come in, I imagine that it should be onto the 2N3906?
L
May 27, 2011. 6:31 AMWesley666 (author)
says:
Yes, I did put a small resistor on the base of the 2N3906, but it's in none of the pictures, thanks, I forgot to mention that.
As for signal input and anything else, I have no idea, I am not great at being given a circuit and figuring it out, I am better at thinking about it while I build it, that's why I need the help, I never intended to build this. Mostly, I want to know if I built this, if it truly would produce the waveform shown on the iPad.
Thanks
As for signal input and anything else, I have no idea, I am not great at being given a circuit and figuring it out, I am better at thinking about it while I build it, that's why I need the help, I never intended to build this. Mostly, I want to know if I built this, if it truly would produce the waveform shown on the iPad.
Thanks
May 27, 2011. 5:31 PMorksecurity
says:
Just wondering: At what amplitude does it claim the oscillation will occur?
If it's a few millivolts, that may just be round-off/sampling error in the software...
If it's a few millivolts, that may just be round-off/sampling error in the software...
May 27, 2011. 8:13 PMWesley666 (author)
says:
It oscillates from a few millivolts to about 2 volts, and from a few microamps to 10ma.
Sorry, I am not convinced the software is doing anything other then pretty
eye wash.
A
eye wash.
A
....since apparently its oscillating with no power supply....bringing us right back e perpetuum mobile.....
Steve
Steve
May 27, 2011. 12:40 PMWesley666 (author)
says:
Where do you get that from? Can you not see it has a negative ground at the bottom and a positive supply rail at the top (5vdc)? It clearly has power, and the software does work, it works fine on other proven oscillators.
I'm on an iPhone
1) the PNP is all ways On !
even if you add a Resistor, yet the Sadw
Does not warn about destructive base current.
2) with a steady +5V on the inductors , I
Don't see how the LRC is pumped
3) That leaves the NPN be diode to do the ocs ?
A
1) the PNP is all ways On !
even if you add a Resistor, yet the Sadw
Does not warn about destructive base current.
2) with a steady +5V on the inductors , I
Don't see how the LRC is pumped
3) That leaves the NPN be diode to do the ocs ?
A
May 27, 2011. 1:19 PMWesley666 (author)
says:
See, that's getting better. So what you are saying is that, this will not work and it is F@$!ing the hell of of the software, correct? So it won't do anything in real life if I were to build it? Yes or no?
May 27, 2011. 1:18 PMgmoon
says:
Ah...guys--
That's why I pointed the OP to other oscillator circuits. He's just experimenting. He can come up with something better.
Regardless of whether this circuit oscillates in a simulator, I've made plenty of circuits that oscillate--that wouldn't have in the sim. :-)
That's why I pointed the OP to other oscillator circuits. He's just experimenting. He can come up with something better.
Regardless of whether this circuit oscillates in a simulator, I've made plenty of circuits that oscillate--that wouldn't have in the sim. :-)
I see a jack with the words +5DC on it. I don't see the power and ground rails formally identified. If one of my assistant engineers drew this for me at work, it would get red-lined and sent back !
May 27, 2011. 1:17 PMWesley666 (author)
says:
That's just the schematic. Its a DC Barrel jack. On the iPad, you can clearly see the 5+ at the top and the ground at the bottom.
May 27, 2011. 1:39 PMWesley666 (author)
says:
No, I wish I could have gotten a screen shot that nice. Now that we are at the same place, if I were to power this (Ignoring any flaws because I am not an engineer and its for my own personal use) would it act the way it is shown on the iPad?
No, As far as I can see Q1 is on all the time - ignore Q2, it doesn't do anything to the oscillator.
 |
