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Simple high efficiency Colpitts oscillator .In the higher frequency ranges, above 50 MHz, Colpitts oscillators are used because stray circuit capacitance will be in parallel with desired feedback capacitance and not cause undesirable spurious resonances that might occur with the tapped coil Hartley design. Simple 50 to 300 MHz Colpitts Oscillator Circuit Diagram The FM VCO shown is a grounded base design with feedback from collector to emitter. A Colpitts oscillator is one of a number of designs for electronic oscillator circuits using the combination of an inductance with a capacitor for frequency determination.As you can see in the circuit diagram , this electronic project require few electronic parts an provide a 50 MHz-300MHz VCO with a tuning range of 2:1 .

Colpitts oscillator is very similar to the shunt-fed Hartley oscillator. The principal difference is in the tank circuit. In the Colpitts oscillator, two capacitors are used as replacement coils are divided. Basic oscillator Feedback oscillator colpitts developed using the "electrostatic field" through the capacitor divider network. Oscillator Colpitts Colpitts oscillator frequency is determined by two capacitors connected in series and inductors. Voltage to the base provided by R1 and R2 while for emiitor given by R4. Collector voltage given back by connecting to the positive part of the VCC through R3. This resistor (R3) also functions as a collector load. Transistor is connected with the emitter-joint configuration. When the DC power supplied to the circuit, current flows from the negative part of V CC through R4, Q1 and R3. IC currents flowing through R3 causes a decrease in the voltage VC with a positive price. Voltage changes to negative direction are supplied to the to...