Advances in electronic technology have made it possible to replace the large scale plug-in crystal oscillator with a small, thin chip crystal oscillator. The previously known plug-in crystal oscillator is generally 2-pin, but the patch crystal oscillator is different. Let's clarify the specifications of the patch crystal oscillator. The SMT crystal vibration of 1,2 feet must be passive crystal vibration. The 2 - and 4-pin SMT crystal oscillator may be passive or active. 3, four feet above the patch crystals must be active crystals 4, active crystals itself has the lower left foot print a point 5, common patch crystals specification is 2.5 * 2.0 mm, 3.2 * 2.5 mm, 5.0 * 3.2 mm, 6.0 * 3.5 mm, 5.0 * 7.0 mm 2 feet passive patch crystals are usually is common on the surface of the ceramic, metal surface there are, of course, but generally speaking, the metal surface by four feet more passive patch crystals. When we use the SMT crystal oscillator we usually encounter the following situation. The four-legged SMT crystal oscillator does not know how to distinguish the pin position. Passive crystal oscillator in the case of four feet, only two feet are functional feet, the other two feet are suspended, no need to access. We call it one foot, two feet, three feet, four feet. How do you normally tell who has one foot and who has two feet? Here's a trick.
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