Impedance mismatch ?

[petemoore]

  42TM022 Primary use as 'output' has two Ge diodes then...whatever is next...say...minibooster input or amplifier input.
  The Secondary, used as input, gets driven by a buffer in the form of a TL082output>1k>47uf type arrangement. Oa Biased using 1Meg voltage divider resistors {Basic AMZ Buffer].
  Is an mpedance Mismatch calculatable with this story ?
  Transformer says '600ohm' secondary impedance, '1k5' primary impedance, I guess they were just picking a scenario to display typical numbers and the reflected impedance of the M022.
  Whatever the case 'it' is working in the form of a FWR and is putting out lots, plenty of HF's...I don't know if I can easily get more drive on the transformers secondary input anyway.

[R.G.]

You're being fooled by the common terms for transformers. Transformers do not really have impedances - they have impedance ratios, and produce the stated frequency range when driven by matched impedances.

The transformer you're looking at will make a load of 600 ohms on its secondary look like 1.5k on its primary. What they don't tell you except hidden in the datasheet is that  they guarantee that impedance ratio to be true over the range of 300Hz to 3.4kHz. And what that's really telling you is that the transformer's primary inductance is no less than a 1.5K impedance at 300Hz to make that all work out; that's an inductance of  L = 1.5K/(2*pi*200Hz) = 0.796H. Actually, it's at least that much, may be more.

The power rating tells you how hard you can drive it. They guarantee 200mW. At 600 ohms, 200mW is  P = V²/Z, so V = SQRT(P*Z) = SQRT(0.2*600) = 10.95Vrms, or 15.5V pk.

It's confusing to work this kind of stuff out about transformers until you've done it a time or two.

[petemoore]

  You're being fooled by the common terms for transformers. Transformers do not really have impedances - they have impedance ratios, and produce the stated frequency range when driven by matched impedances.
  Fooled enough to post my stumped ness.
  The transformer you're looking at will make a load of 600 ohms on its secondary look like 1.5k on its primary.
  I followed that bit, the rising impedance w/rising frequency thing.
  What they don't tell you except hidden in the datasheet is that  they guarantee that impedance ratio to be true over the range of 300Hz to 3.4kHz.
  And what that's really telling you is that the transformer's primary inductance is no less than a 1.5K impedance at 300Hz to make that all work out; that's an inductance of  L = 1.5K/(2*pi*200Hz) = 0.796H. Actually, it's at least that much, may be more.
  The power rating tells you how hard you can drive it. They guarantee 200mW. At 600 ohms, 200mW is  P = V2/Z, so V = SQRT(P*Z) = SQRT(0.2*600) = 10.95Vrms, or 15.5V pk.
  Wow that is a big number derived from a large number of numbers !
  I can actually read and enjoy them, thanks be written to RG for this response !
It's confusing to work this kind of stuff out about transformers until you've done it a time or two.
  True, I can read what you wrote, and follow, I'm easily lost in the sea of large numbers and decimal points, every time I have to ask, how did that go ?
  I'll see if I can cajole the circuit to work differently now.

[R.G.]

Transformers don't like to be unloaded. They ring and arc if the voltage is anything but a sine wave if they're unloaded.

Capacitors don't really like to be loaded. They cause big currents to flow if the loading changes.