Eight
Member level 2
Hi.
I'm trying to build a Wien bridge oscillator for producing an AC signal of about 4 kHz. I've done a lot of searching, and I found a number of circuit designs. Most of them are very similar, but there are a lot of differences when it comes to the feedback loop modification. Actually there are too many of them because I'm being confused and don't know which one to use. So I'm looking for some recommendations. The output frequency will be static of about 4 kHz, and the opamp (TL071) supply voltage will be a dual +/-9V. The output doesn't have to be *exactly* rail-to-rail, but I'd be happy, if the sine peaks reach at least +/- 7v. The output will go through a 100 kOhm potentiometer to GND. The adjustable part will be connected to another opamp, so we won't be drawing much current.
Can someone suggest me which design to use?
This one is the most basic design. I'd like to avoid using the lamp.
The lamp can be replaced with resistor. This is supposedly unstable.
Some people suggested that two diodes be added for stabilization.
Another diode placement. This is where it gets confusing.
Yet another different design:
I've also seen some designs with JFETs.
I'm trying to build a Wien bridge oscillator for producing an AC signal of about 4 kHz. I've done a lot of searching, and I found a number of circuit designs. Most of them are very similar, but there are a lot of differences when it comes to the feedback loop modification. Actually there are too many of them because I'm being confused and don't know which one to use. So I'm looking for some recommendations. The output frequency will be static of about 4 kHz, and the opamp (TL071) supply voltage will be a dual +/-9V. The output doesn't have to be *exactly* rail-to-rail, but I'd be happy, if the sine peaks reach at least +/- 7v. The output will go through a 100 kOhm potentiometer to GND. The adjustable part will be connected to another opamp, so we won't be drawing much current.
Can someone suggest me which design to use?
This one is the most basic design. I'd like to avoid using the lamp.
The lamp can be replaced with resistor. This is supposedly unstable.
Some people suggested that two diodes be added for stabilization.
Another diode placement. This is where it gets confusing.
Yet another different design:
I've also seen some designs with JFETs.
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