This well-designed sinusoidal oscillator by Wien bridge was found in ancient European documentation. Transistors support equivalents, including FET which can be a BF245. The operational amplifier can be of a more modern type and the power must be supplied by a symmetrical source. Capacitors and resistors in the oscillating sector determine the frequency of the circuit (R1 and C1). R2, and C2 must be the same value.
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