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my_piezos.md

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Understanding the piezos impedance matching

Measurements

Freq Re(Water) Im(Water) Return loss Target C// L= L// C=
BiVi
Salvaged 6.7 24 -21 -7.3dB 50 494pF 1.02µH 1.14µH 6nF

( generated with that. )

See there

https://www.analog.com/en/design-center/interactive-design-tools/rf-impedance-matching-calculator.html

my_adrus

Bard 20200808r into details

  • Pins 4 and 5: piezo.
  • 3: gnd
  • 1: bobin upper, thin
  • 2: bobin lower
  • 8: thin (paired to 1? )
  • 7 : thick, bobin
  • 6: bobin, low, thick

-> Spectrum interesting, resonance below 50kHz between 1/8 pair

Interestingly, the schematics is described in this patent, US4399703A, by Dymax.

Bard details