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2. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   The antenna coupling transformer also functioned as an impedance matching transformer, that allowed a better match of the antenna impedance to the rest of the circuit. One or both of the coils usually had several taps which could be selected with a switch, allowing adjustment of the number of turns of that transformer and hence the "turns ratio".

3. Impedance matching - Wikipedia

   en.wikipedia.org/wiki/Impedance_matching

   Practical impedance-matching devices will generally provide best results over a specified frequency band. The concept of impedance matching is widespread in electrical engineering, but is relevant in other applications in which a form of energy, not necessarily electrical, is transferred between a source and a load, such as in acoustics or optics.

4. Crystal earpiece - Wikipedia

   en.wikipedia.org/wiki/Crystal_earpiece

   The high impedance of the earpiece means that any audio-range signal applied to the tip of the connector will be heard in the earpiece. This quick-and-dirty technique can remove the need for setting up and probing with an oscilloscope or connecting an amplifier to the test point in the first instance.

5. Immittance - Wikipedia

   en.wikipedia.org/wiki/Immittance

   In electronics, an immittance Smith chart can be created by overlaying both the impedance and admittance grids, which is useful for cascading series-connected with parallel-connected electric circuits. This allows for the visualization of changes in impedance or admittance in the system caused by components of either the series or parallel circuit.

6. Network synthesis - Wikipedia

   en.wikipedia.org/wiki/Network_synthesis

   For impedance matching networks, a better match can be obtained by also setting a minimum loss. That is, the gain never rises to unity at any point. [48] Time-delay networks can be designed by network synthesis with filter-like structures. It is not possible to design a delay network that has a constant delay at all frequencies in a band.

7. Are Dogs Lactose Intolerant? What Experts Advise About ...

   www.aol.com/dogs-lactose-intolerant-experts...

   Not all questions have simple, yes or no answers—including this one. While many dogs are lactose intolerant, many are not! Lactose intolerance develops as a dog grows up, so it can be impossible ...

8. Orange Cat Determined to Hunt Bug on Ceiling Is a Lesson in ...

   www.aol.com/orange-cat-determined-hunt-bug...

   The orange cat in this video is desperate to catch a bug hanging out on the ceiling of his home—so desperate, in fact, that he may be taking his very life in his hands.

9. Audio system measurements - Wikipedia

   en.wikipedia.org/wiki/Audio_system_measurements

   To deliver maximum power to the load, the impedance of the driver should be the complex conjugate of the impedance of the load. In the case of a purely resistive load, the resistance of the driver should be equal to the resistance of the load to achieve maximum output power. This is referred to as impedance matching. Intermodulation distortion ...