Ceramic resonators similar to crystal oscillators are used to generate specific frequencies for your circuit, These little guys are bread-board friendly (0.1" pin spacing) and easy to use. They have 0.5% accuracy and work precise enough for UART or other baud-rate generation. For ultra-high precision needs (USB timing, long-term time-keeping, RF/PLL/VCO driving) you may want to go for a crystal oscillator instead. This pack comes with 50 ceramic Resonators!
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