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Gayan Sameera, profile picture
Uploaded byGayan Sameera
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frequency counter

The document describes a VHF 80MHz-160MHz frequency counter. It uses an LC7265 and LB3500 prescaler to measure frequencies within this range with a resolution of 50 kHz. It can handle input voltages between 100mV to 600mV RMS and supports several common FM intermediate frequencies between +10.7 MHz and -10.65 MHz. The circuit diagram and component list are provided.

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VHF 80MHz-160MHz Frequency Counter 4S6GGS In My design use LC7265 and presaler LB3500 www.4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter In My design use LC7265 and LB3500 prescaler Display Range High order 1 digit zero blank and static lighting system. 50 KHz step /FM 5 digits Covers intermediate frequencies +10.7, +10.725, +10.750, +10.675 / -10.700, -10.725, -10.675, -10.650 In put voltage 100mV – 600mV rms Input frequency 80MHz – 175MHz VHF Range LED DISPLAY Wiring Diagram 2 x 1 character 7 segment, decimal points right / 15-mm 2 character 7 segments, decimal point right 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter FM IF select FIF1 (11pin) 0 0 0 0 1 1 1 1 FIF2 (12pin) 0 0 1 1 0 0 1 1 FIF3 (13pin) 0 1 0 1 0 1 0 1 IF (MHz) +10.700 +10.725 +10.675 +10.750 –10.700 –10.725 –10.675 –10.650 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter PCB H x 45.53mm W x 55.1mm 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter C1 –C5 - 10uF R1 – 4.7k U1-LC7265 C2 - C4 - 22p X Tal – 7.2MHz U2 – LB3500 C3 – 0.01uF L1 – 10uH U3 – LM7805 C6-C7-C11 – 0.001uF C9-C10 – 100p C8- 68p 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com
VHF 80MHz-160MHz Frequency Counter 4S6GGS – Gayan E mail – 4s5gs.gayan@gmail.com