project : signal generator

[yukanti]

need help in building signal generator that consists:
1. Phase-Shift Oscillator
2. Blocking Oscillator
3. CMOS Oscillator
for Phase-Shift Osc, i have all the material i needed, but for Blocking- and CMOS Osc, i don't have any theory, schematics and its equations needed.
Can anyone help?

thanks

 

[Russlk]

A blocking oscillator uses a transformer with positive feedback from output to input. The positive feedback drives the amp into saturation (blocking) which stops the feedback and then it starts again.

A CMOS oscillator could be any number of circuits, but you are probably looking for one using a logic inverter with positive feedback. Two inverters provides the proper phase, and an R - C will set the frequency.

 

[chemelec]

Why not just use an XR2206 or an ICL8038 Function Generator. Much Simpler and they give Various Waveforms.

 

[yukanti]

replies

do you have any schematic examples of those circuits?