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Audio Injector
https://www.audioinjector.net/rpi-zero
Audio Injector. A sound card for the Raspberry Pi with full functionality - inputs, outputs & an electret microphone port - Small enough to fit a Zero! We are bringing you the zero version of our wildly popular Audio Injector Raspberry Pi sound card. The sound card which is input capable, output capable and is ready for your to solder on an ...
About the crystal oscillator ppm - Electrical Engineering ...
https://electronics.stackexchange.com/questions/586254/about-the-crystal-oscillator-ppm
The ppm is used to determine time drift t d r i f t. Typically crystal oscillators frequency changes from a nominal frequency f n o m i n a l to an off nominal frequency f when subject to different temperatures. If this occurs over time duration t then your measured time will be different than your actual time.
What do I use to measure the ppm of a crystal. - Page 1
https://www.eevblog.com/forum/testgear/what-do-i-use-to-measure-the-ppm-of-a-crystal/
For example, a 10 MHz crystal with a tolerance of 5 ppm can vary in frequency by 50 Hz (1 ppm of 10 MHz is 10 Hz). To check if the crystal is in tolerance you will have to insert it in the proper circuit to get it to oscillate and then measure the output with a frequency counter.
What is the ppm in the crystal oscillator? - Electrical ...
https://electronics.stackexchange.com/questions/15851/what-is-the-ppm-in-the-crystal-oscillator
Like Olin said, ppm stands for parts per million, and it indicates how much your crystal's frequency may deviate from the nominal value. The MC-306 exists in a 20 ppm and a 50 ppm version.
How ppm is dominant factor in crystals and so as in real ...
https://pateldiv68.wordpress.com/2015/03/23/how-ppm-is-dominant-factor-in-crystals-and-so-as-in-real-life/
The de facto standard in the industry for crystal inaccuracy is 20 PPM, which is always interpreted as a plus or minus number (±20 PPM). In a general sense, for this inaccuracy figure we can state that after 1 million actual parts, the …
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