need help oscillator design

[shahrol_hisham]

I now try design a rf transmitter. In my design i have to used a oscillator as a part of the design. Can any body help me in how to design a rf oscillator. What the formulla and what paremeter need to take in account. I have a schmatic for crystal oscillator but what i need here is how to design the oscillator start from zero.

 

[arebee]

Quite a few books on oscillator design have been uploaded over the years, trying searching I'm sure you'll find what you need.

 

[jordan76]

check the following link:


good luck!

regards,
jordan76

 

[shahrol_hisham]

Hire i find a note in how to design rf mixer using transistor. This circuit is to complet the receiver circuit after i design a transmiter.

 

[shahrol_hisham]

vcc ---------------------------------------
| | |
| | -------
C R L VC
| | -------
| | |
a----------- ----------------K
|
|
gnd --------------------------------------


The circuit show above is a oscillator i made for fr transmitter. I used 2n2222 transistor L is inductor - i just make a few turn from wire, VC is veriable capacitor. R i used 200 ohm and capacitor c 0.01u. for vcc i used 9v. Hire i not sure about the frequency but when i tune near a radio i get a sound when i turn a VC. For transmiting a data i just pull out the cap c and connect the uc with data signal at point a. The modulation it used now is ook on off keying. now i working for receiver circuit if it work i will write in this forum.

 

[shahrol_hisham]

sorry for above circuit hire i post a new circuit in bmp format. I dont have schmatic writer software.