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Experiments with a PC sound card - LeapSecond
http://www.leapsecond.com/pages/sound-1pps/#:~:text=The%20output%20impedance%20of%20a%20PC%20sound%20card,Loran-C%2C%20GPS%2C%20Rubidium%2C%20or%20Cesium%20clock%20frequency%20source.
Sound card impedance - PC Review
https://www.pcreview.co.uk/threads/sound-card-impedance.3864569/
The 1 ohm output impedance is a small signal kind of rating, more of academic interest than anything else. The 32 ohm rating is the one to pay attention to, as that one is a "full power" rating. As long as your vendor uses amplified equipment, with line level inputs using 1 volt RMS levels, you should be fine.
Daqarta - Sound Card Impedance Measurement
https://www.daqarta.com/dw_0azz.htm
Sound Card Input Impedance: The input impedance of a device is typically regarded as a resistor and capacitor in parallel with each other from the input terminal to ground. To measure these values, the device is driven through a resistor in series with the input, from a source with a known output impedance.
audio - How do PC sound cards cope with headsets of ...
https://electronics.stackexchange.com/questions/345196/how-do-pc-sound-cards-cope-with-headsets-of-different-impedance
Comprehensive load impedance sensing allows the MAX9856 to autodetect most common audio and audio/video headset and jack plug types Then, later: HPL, HPR, and JACKSNS provide a headset detection feature which can both detect the insertion of …
Experiments with a PC sound card - LeapSecond
http://www.leapsecond.com/pages/sound-1pps/
The output impedance of a PC sound card headphone output is quite low so either 1M or 50R input termination can be used. For a TI counter use a 250 mV DC trigger level at 50R. Measuring frequency accuracy and stability is then done as if this were any other 1 PPS timing source, such as an XO, TCXO, OCXO, WWVB, Loran-C, GPS,
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