Cheap And Discounts 5pcs 77.76MHZ 77.760MHZ 77.76M In-line active crystal oscillator clock square half size DIP-4 OSC Wholesale. Buy Directly From Merchant Ccrystal oscillator Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.