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Therefore, the type used with crystal set radios (and other sensitive equipment) was wound with more turns of finer wire giving it a high impedance of 2000–8000 Ω. [ 106 ] [ 107 ] [ 108 ] Modern crystal sets use piezoelectric crystal earpieces , which are much more sensitive and also smaller. [ 104 ]
One remaining use for crystal earpieces is in crystal radios. Their very high sensitivity enables them to use the very weak signals produced by crystal radios, and their high impedance (on the order of 20 kilohms) is a good match for the typical crystal radio. They have also been used as microphones, with their high output requiring less ...
Higher impedance headphones are more tolerant of amplifier limitations, but produce less volume for a given output level. Historically, many headphones had relatively high impedance, often over 500 ohms so they could operate well with high-impedance tube amplifiers. In contrast, modern transistor amplifiers can have very low output impedance ...
Maximum power is transferred from one circuit to another when their impedance (resistance) is equal. However, in a crystal receiver, the impedance of the antenna-ground circuit (around 10-200 ohms) is far less than the impedance of the tuned circuit (L1, C1) (thousands of ohms at resonance) and varies depending on the length of the antenna, etc..
In analog circuits a high impedance node is one that does not have any low impedance paths to any other nodes in the frequency range being considered.Since the terms low and high depend on context to some extent, it is possible in principle for some high impedance nodes to be described as low impedance in one context, and high impedance in another; so the node (perhaps a signal source or ...
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