7 segment LED 6-digit precision TCXO 12.8MHz (1ppm), PIC16F84 with 1MHz ~ 300MHz (400MHz) IF offset frequency counter. TD7104P (Prescaler ÷ 8, ÷ 1) +2 SC1906 later in the preamp, PIC 16F84A-P20 count, LED display TC4511 drivers. Kaynak: Frequency Counter LED 6 digit alternatif