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Frequency Counter

Portable and Auto-Calibrating Via GPS

Frequency Counter
Frequency Counter
The major limitations of an inexpensive frequency counter are the poor medium- to long-term stability and the lack of an internal reference source for calibration. The project in this article overcomes these drawbacks by implementing a very stable TCXO and a highly accurate satellite reference source.
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Materials

Component list

Component List

Resistors

(1206, unless otherwise noted)

R1 = 1 MΩ

R2 = 100 kΩ

R3, R10 = 22 Ω

R4 = 470 Ω

R5 = 330 Ω

R6, R8 = 22 kΩ

R7 = 390 Ω

R9 = 680 Ω

R11 = 2.2 kΩ, 1%

R12 = 1 kΩ, 1%

R13, R14, R19, R21, R22 = 10 kΩ, 0805

R15 = 510 kΩ, 1%, 0805

R16 = 150 kΩ, 1%, 0805

R17, R18 = 1.8 kΩ, 1%, 0805

R20 = 220 Ω, 0805

R23 = 0.4 Ω

R24, R25 = 1 kΩ, 0603

R26, R27 = 5.1 kΩ, 0805

R28 = 1.2 kΩ, 0805

 

Capacitors

(1206, unless otherwise noted)

C1 = 220 nF, 0805

C2 = 47 pF

C3, C5, C9, C12, C14…C17, C19 = 10 µF, 0805

C4 = 100 pF

C6, C8, C11, C18 = 100 nF, 0805

C7 = 150 pF

C10 = 10 nF, 0805

C13 = 220 µF

 

Semiconductors

D1 = BAT18-04

D2 = LED, red

D3 = LED, blue

Q1 = MMBFJ309

Q2, Q3 = BC849C

Q4, Q6 = AO3400

Q5 = SI2305

U1 = TLV3501AIDB

U2 = PIC18F24Q71 SO

U3 = 2.23" OLED Waveshare

U4 = LC86G Quectel

U5 = MCP1703-3302CB

U6 = MCP1640B

U7 = TC4056A

 

Inductors

L1 = 4.7 µH, 1210

L2 = 1 mH, 1210

 

Miscellaneous

SW1 = Schurter 1241 SMD switch

Y1 = 64 MHz TXCO

BT1 = Li-ion 18650 cell

2×2 Header

4×2 Header

2× 5 mm, M3 spacer

4× 4 mm M2.7 spacer

Enclosure Datec-Mobil-Box S

 

 

 

 

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