hey there experts , could you please help me on this ?
Im doing my engineering undergrad course and my final year project require to construct a a colpitts oscillator LC tank circuit in a bread board which will have a drop in frequency value as varying the inductor( the inductor am using now is fixed but will be replaced by a variable coil after making the circuit work) , one way of doing so is to use NE602 (same as SA602a) IC chip.
the chip has this pic configuration
The power supply was connected to a 150Ω resistor then to pin 8, also it was bypassed to ground with a 4n7F capacitor.
Pin 1 was grounded through a 10kΩ resistor while pin2 to through a 10nF capacitor and obviously pin3 to ground
and finally the oscillator configuration is shown below
measuring the output from pin 4 or/and 5 directly by a scope should give a frequency of 10MHz. However for some reason this didnt work, i tried couple of different values for capacitor and inductor in the LC tank according to colpitts oscillator equations but it seems its not connected to the circuit somehow.
any kind of help or tips by you engineers is very appreciated
Im doing my engineering undergrad course and my final year project require to construct a a colpitts oscillator LC tank circuit in a bread board which will have a drop in frequency value as varying the inductor( the inductor am using now is fixed but will be replaced by a variable coil after making the circuit work) , one way of doing so is to use NE602 (same as SA602a) IC chip.
the chip has this pic configuration
The power supply was connected to a 150Ω resistor then to pin 8, also it was bypassed to ground with a 4n7F capacitor.
Pin 1 was grounded through a 10kΩ resistor while pin2 to through a 10nF capacitor and obviously pin3 to ground
and finally the oscillator configuration is shown below
measuring the output from pin 4 or/and 5 directly by a scope should give a frequency of 10MHz. However for some reason this didnt work, i tried couple of different values for capacitor and inductor in the LC tank according to colpitts oscillator equations but it seems its not connected to the circuit somehow.
any kind of help or tips by you engineers is very appreciated