I
ran across a handy formula for finding transformer low frequency cutoff
with different impedance matches. This can be handy when using a mod transformer
that is rated at a certain primary and secondary impedance, on different
impedances (same ratio of course). This will tell you how far you can go
before you start to lose the low frequency response.
f low = (rg x Rl)/[2pi
x Lp(n squared x rg + Rl)]
Where: f low = -3db
point
rg = generator source resistance
Rl = secondary load resistance
Lp = primary inductance in henries
n = the turns ratio Ns/Np
x means multiply (times)
Another
thing in the same book:
Transformer
saturation is observed on an oscilloscope as gross distortion of the secondary
wave form from the applied source. A transformer that saturates at 15 volts
at 6 Hz will saturate at 150 volts at 60 Hz. |