Simple Audio-Frequency Vco

Posted on Feb 7, 2013

The frequency of this sine-wave oscillator is determined by a direct voltage, U` of 0 to 15 V. The distortion on

Simple Audio-Frequency Vco
Click here to download the full size of the above Circuit.

output signals of up to 10 Vpp is not greater than 1 o/o. When the output is reduced with the aid of P1 to 1 Vpp, the distortion drops to below 0.1 o/o. It is not recommended to use output signals below 1 Vpp, because the oscillator then becomes unstable and temperature-dependent. The oscillator consists of two operational transconductance amplifiers (OTAs) contained in one package. Their Amp-bias inputs, pins 1 and 16, are connected in parallel. These inputs can drive the output currents at pins 5 and 12 to a peak value of up to 0. 75 rnA. Switch S1 enables the oscillator output to be set to two ranges: 6. 7 to 400Hz and 400Hz to 23.8 kHz. The overall range needs a control voltage that varies from 1.34 to 15 V. When the frequency is changed by a variation of Uc and the setting of P1 is not altered, the output signal might be distorted. In other words, the amplitude of the signal must be adapted to the frequency.

Leave Comment

characters left:

New Circuits



Popular Circuits

high gain antenna 43dB amplifier circuit
analog line follower robot
simple microphone preamplifier
Soft Musical Telephone Ringers
TDA1083 Am radio receiver circuit diagram electronic project
Parallel Port Stepper Motor Driver With Discrete Components
Mains Slave Switcher
Beeping Down Counter Circuit