Hi all
I built wien bridge oscillator using a lamp to control amplitude, but I see that the oscillation is irregular.
One thing I noticed is that the amplitude is very sensitive to the variation of R1.
If I reduce R1 to 620 ohms the oscillation starts to swing until it dies close to zero. (printscreen 1).
If I increase R1 to 630 ohms, the oscillation increases to a maximum value, then starts to drop until it reaches zero. (printscreen 2).
Could someone give me a hint on how I can stabilize this amplitude?
I built wien bridge oscillator using a lamp to control amplitude, but I see that the oscillation is irregular.
One thing I noticed is that the amplitude is very sensitive to the variation of R1.
If I reduce R1 to 620 ohms the oscillation starts to swing until it dies close to zero. (printscreen 1).
If I increase R1 to 630 ohms, the oscillation increases to a maximum value, then starts to drop until it reaches zero. (printscreen 2).
Could someone give me a hint on how I can stabilize this amplitude?
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