This voltage-controlled oscillator with two operational amplifiers and a transistor that can be the BC548 has linear characteristics. The circuit can generate signals up to 10 kHz, depending on the capacitor used and the power supply must be symmetrical. The output signal is rectangular, and the control voltage must be at most up to the supply voltage of the circuit. Other operational amplifiers can be used. The zener diodes determine the amplitude of the output signal.
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