Broli post :

http://www.energeticforum.com/renewable-energy/5811-parametric-excitation.html#post98702

A couple of questions here . Does anybody know if the oscillation amplitude in a parametric oscillator would depend on frequency? I want to keep the resonant frequency low so that I can use mechanical switching . Also , can anyone offer a wild guess as to the inductance in Henrys of a microwave oven transformer . This transformer is  220 volt to 2000 volt step up transformer and is quite large . Please estimate both the primary and secondary windings .

Quote from: neptune on April 19, 2011, 01:17:29 PM
A couple of questions here . Does anybody know if the oscillation amplitude in a parametric oscillator would depend on frequency? I want to keep the resonant frequency low so that I can use mechanical switching . Also , can anyone offer a wild guess as to the inductance in Henrys of a microwave oven transformer . This transformer is  220 volt to 2000 volt step up transformer and is quite large . Please estimate both the primary and secondary windings .

hi Nep

how's the knee?  recovering nicely after that impact with the poynt gonads?

AC signals across effectively 'unloaded' LC pairs will vary in amplitude with 'f', having a maxima or minima at the res. freq. depending on the LC pair being parallel or series respec.

i seem to remember from seeing one of woopys recent vids that he wrote the Iy / IIy inductances on the MOT which was featured

hope this helps - good aim, btw, obviously touched a nerve or two
np


http://docsfreelunch.blogspot.com

Quote from: neptune on April 19, 2011, 01:17:29 PM
A couple of questions here . Does anybody know if the oscillation amplitude in a parametric oscillator would depend on frequency? I want to keep the resonant frequency low so that I can use mechanical switching . Also , can anyone offer a wild guess as to the inductance in Henrys of a microwave oven transformer . This transformer is  220 volt to 2000 volt step up transformer and is quite large . Please estimate both the primary and secondary windings .

I just did a quick check with 2 220V MOT's I have;

700W Primary 180mH. Secondary 12.8H.
800W Primary 195mH. Secondary 18.1H.

@Sprocket . Re the knee ,LOL .Many thanks for those values of inductance.Re my question regarding Frequency . What I meant was , assuming this oscillator idea works , would it give more power out if the frequency was say 1Mhz as opposed to 50 Hz . There would be advantages in 50Hz , One could use a standard transformer and not have issues with the core materials .Also , if mechanical switching was used , a switching rate of 100Hz is feasible ,whereas this is not true at 1Mhz .My idea was to use the primaries of 2 transformers across a capacitor . then use a switch to short out one transformer at the right frequency .A meter or scope across one of the secondaries would detect oscillation .