Using LM111 voltage comparator , LM101 operational amplifier and some other electronic parts , can be designed a very simple and efficiency voltage controlled oscillator .
Voltage-controlled oscillator (VCO) is an oscillator that its frequency is controlled using a voltage signal.
The VCO described here provide both triangular and square wave output. The control voltage can be varied between 5 mV to 5 V, to produce oscillation frequency from 10 Hz to 10 KHz.
As you can see in the circuit diagram , this VCO electronic project , require few electronic parts and is very easy to be designed .
This voltage controlled oscillator VCO must be powered from a dual 15 volt DC power supply .