40khz RF oscillator deisgn

[gut_but]

hi
can anybody help me in designing a RF oscillator using op-amp's and opamp shud hav a operating voltage of 5V or less.
if possible send me a circuit of op-amp in CMOS technology
newbie

 

[Nigel Goodwin]

hi
can anybody help me in designing a RF oscillator using op-amp's and opamp shud hav a operating voltage of 5V or less.
if possible send me a circuit of op-amp in CMOS technology
newbie

40KHz isn't RF, it's ultrasonic (high audio). Also what waveform are you looking for?.

It's probably a good idea to mention what you want it for?.

 

[stevez]

While I agree that much of the time 40 kHz is representative of ultrasonics it could also represent VLF radio frequency. I know WWVB runs at 60 kHz and other radio stations run below that.

The following was taken from a VLF group site: "The Natural Radio VLF group is a discussion group dedicated to those who enjoy monitoring radio frequencies in the VLF radio spectrum and slightly below the VLF (very low frequency) spectrum (3-30 KHz). This is a form of radio astronomy. We listen to the amazing "radio" sounds created by planet earth such as whistlers, chorus, tweeks, risers, spherics and hiss on simple VLF receivers (whistler receivers)."

I presume that a 40 kHz oscillator intended for ultrasonic use would be coupled to a transducer - one for transmitting would be coupled to an antenna. I would expect that to drive significant differences in circuitry.