Thank you! I have been interested in WBR Regenerative receivers lately and had not gotten around to figuring what this bridge was all about. Very nicely explained.
Very thorough. Thank you. I am investigating ways to create a 60Hz sine wave. This has more promise than an LC Tank, because of the high values of inductance and capacitance needed to have the frequency be that slow. I hope I said that well, as I am just a hobbyist.
I am very impressed by your presentation. I had no problem at all understanding the circuit as you explained it. I'll have a go now building it myself, and maybe try out Hewlett's method of stabilizing it which you alluded to!
I've made a few different sine-wave oscillators using what I've learned from your videos but now I finally tried out the Wien bridge oscillator. I only had a single-rail power supply and an LM324 op-amp on hand but I managed a passable result! I used a small filament lightbulb for stability. I don't think my finicky setup would've worked as well with a resistor as I had to introduce a bias-voltage to keep the oscillation above ground potential for the amplification to work. It definitely produces less distorted signals than the common emitter phase shift oscillator I tried earlier. i.imgur.com/cyLUQO5.png
Again nice video. I would have wished you would include a self-regulating gain circuit with 2 parallel diodes in opposite directions and a Resistor to get a more stable sine wave.
Everybody seems to give the same speech about the Wien Bridge oscillator with an op-amp but nobody shows how to calculate the values if the sinewave like the Vpp And current giving a DC input voltage rail of V+ and V- on the Op-amp. I there a way to calculate the V(t) and I(t) of the sinewave?
can we drive some load with it? i mean can we add buffer and rectifier block and micro-ampere meter to measure some impedance or ESR of components like capacitors
Thank for the video. Is there any calculations for output voltage. I've been searching for this and I found no answer or they mention that Vpp is close to DC supply voltages
excellent! thank you. Why it's limiting the amplitude nicely if there is no bulb or anything for limiting? Also, what's the frequency range preserving a decent amplitude?
If I need single frequency constant voltage generator can I use that scematic without AGC? Or it can go wrong with any deviation of temperature/supply voltage/Mars's weather? I saw solution with incandescent lamp in feedback circuit but... I don't know, don't want install actual lamp in my circuit lol.
Hello sir and thank you for your very informative videos. I have a question for you: I would like to make a circuit that can give me a rectangular signal between 0V and 5 V. A kind of switch, but with a smaller rise time in the order of 50ns to 100ns. I tried with the Mosfets, but the output siganl to a lot of swings and noises. What you can advise me or have already made a circuit like that. I like to test the filters placed at the retraction of a microcontroller by placing this signal recregular and read the response of the filter. Thank you
Can you make another video about detailed constructing the circuit on the bread board and the ways of connecting the ac source to the circuit and connecting the oscilloscope across the output terminals to measure or detect the output
Very nice and explicit video. That is what I was looking for. One question: Can this formulas be applied on all op-amps or only on this LM741? Is there any specific characteristic that must fulfill the op-amp.
Thanks for this video. just one question : i understand that this circuit make oscillation but a priori u dont know which amplitude it will have, so how can we fix an oscillation with a specific amplitude value ??
Jaafar Belouaret maybe add another amplifier which takes the output then amplifies it, and if need more power or current add a buffer after that amplifier ..good luck
My UA741CP op amps doesn't have that "dot" ( sorry, dunno what it's called) over the pin 1 ... Is it alright ? I tried like a million times making a simple non - inverting amplifier but it didn't work every time . Is it a fake ? Sorry for poor english. Thnx for the great video. -A New electronics enthusiast
It must have some key mark. Don't need exactly dot near first pin, there is some options. If it dont work try with another OP amp. And if you mess with OP amps you better know difference between bipolar and unipolar power source. Many OP amps need some bias or dual power supply for work correct. For inverting amp for example if you want use single supply you should connect non inverting input not for ground like in generic schematic but to voltage devider which provide 1/2 supply voltage. It also requires decoupling capacitor on input and output. Similar way for non-invert amp but devider connects just on input of that circuit.
Great video man! I was wondering if you could include the algebra to get the expression Vout= 1/3+j(wRC-1/wRC) x Vin. I'm having trouble with the derivation
Theory explained very well..i wish you could explain how you exactly made the circuit on the breadboard, because while performing this experiment in the lab, i'm facing some difficulties.
Good question. Electronic noise provides the initial impetus to get the oscillator started. Noise in the circuit, distributed over a range of frequencies, provides signals that are in turn amplified. As these signals travel around the circuit loop, they are amplified and effectively filtered until essentially one frequency dominates. This is the resonant frequency of the oscillator, which depends on the specific values of different circuit elements.
You might have more luck if you search 'Bulb stabilised wien bridge oscillator I have an LF411 op amp and bulb running at 1 Khz will work Perfectly at 10 @@ironpark4042
