oscillator circuit with opamp and zener diode

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#1 21668106 16 May 2013 06:13

joko Ivanovic joko Ivanovic

Anonymous

Post #1
21668106 16 May 2013 06:13

Any suggestions how this circuit works?

Thanks.
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#2 21668107 16 May 2013 06:50

David Adams David Adams

Anonymous

Post #2
21668107 16 May 2013 06:50

The zener causes the output to be a pulsed (Square wave) output instead of a sinusoid
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#3 21668108 16 May 2013 06:55

Rohit Dubla Rohit Dubla

Anonymous

Post #3
21668108 16 May 2013 06:55

Looks like a schmitt trigger oscillator. By the way the resistors and capacitor are used it is probably a saw-tooth wave generator with R2 & R3 determining the slope of the rising and trailing edges. The zener helps control the amplitude between 0 to 3V *OR* maybe it chops off the tops of the sawtooth wave thereby creating an output that has a trapezoidal waveform.
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#4 21668109 16 May 2013 16:42

Steve Lawson Steve Lawson

Anonymous

Post #4
21668109 16 May 2013 16:42

Used CircuitLab (an online simulator) to simulate this:

https://www.circuitlab.com/circuit/nm6cxk/eeweb_strangeopamposcwithzener/
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#5 21668110 17 May 2013 09:06

Rohit Dubla Rohit Dubla

Anonymous

Post #5
21668110 17 May 2013 09:06

It indeed looks like a sawtooth/rectangular wave generator depending on where you take the output from. From the op-amp's o/p you get a rectangular wave and from the point marked "B" (or "T-node" in the circuitlab schematic) we get a sawtooth wave with slopes depending on R2, R3 & C.
#6 21668111 17 May 2013 10:51

Steve Lawson Steve Lawson

Anonymous

Post #6
21668111 17 May 2013 10:51

That's not really a true _sawtooth_/_triangle_ wave (i.e. it wouldn't have the proper harmonic profile).
#7 21668112 18 May 2013 00:59

Rohit Dubla Rohit Dubla

Anonymous

Post #7
21668112 18 May 2013 00:59

Well, yes I do agree that its not true sawtooth because the waveshape doesn'e exactly have linear sides. But I guess for the purpose where the slope isn't too critical, I guess we can term it as sawtooth. The o/p waveform basically is the charge/discharge profile of the capacitor and since it is via resistors it will have an exponential function.
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oscillator circuit with opamp and zener diode

oscillator circuit with opamp and zener diode

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