project : signal generator

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

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.

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

replies

do you have any schematic examples of those circuits?