2 layers51 × 54 mm
Pll1
SohithTondepu/Phase-Locked-Loop
This repository contains the complete design and implementation of a basic Phase-Locked Loop (PLL) circuit, referred to as PLL1.
15 parts
2 layers87.2 × 58.2 mm
FINAL PROJECT
LakshmanRohit/PLL-Type2- Size
- 87.2 × 58.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 47
- Pads
- 141
- Tracks, vias
- 241, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 15 Jun 2026
- Updated
- 19 Oct 2026
Overview
FINAL PROJECT is an open-source printed circuit board by LakshmanRohit, from the LakshmanRohit/PLL-Type2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 87.2 × 58.2 mm with 33 parts on 47 nets, routed with 241 tracks and 0 vias.
It is built around the LM324N, CD74HCT74E and NE555P, with the SN74AC00N, BC557 and BC547 among its other parts. Its parts include 10 transistors, 7 resistors, 6 ICs, 5 capacitors and 1 connector.
Main components
6
LM324N
DIP-14-16V~-1.5V、1.5V~16V -40℃~+85℃ 1.5V~30V 250nA 35mA 4 50nA 600uA 7uV/℃ 80dB 9mV DIP-14 Operational Amplifier ROHSHGSEMIOperational AmplifierCD74HCT74E
PDIP-14-55℃~+125℃ 1 10pF 2 35ns@4.5V,50pF 4.5V~5.5V 4mA 4mA 4uA 50MHz 74HCT Series Complementary type D-Type Rising Edge Set and Reset PDIP-14 Flip Flops ROHSTexas InstrumentsFlip Flops
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / CountersSN74AC00N
PDIP-14-40℃~+85℃ 2.1V~3.85V 24mA 24mA 2V~6V 2uA 4 74AC Series 8ns@5V,50pF 900mV~1.65V NAND Gate PDIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates
BC557
TO-921 PNP 100mA 100nA 150MHz 45V 500mW 6V 800 90mV、250mV PNP TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
README
README.mdPLL-Type2
LTSpice Model |
KiCad - Schematic |
Layout |
Layout - 3D View |
PCB (Before Soldering) |
Final PCB |
Working video: https://www.youtube.com/watch?v=WpeVHUnthCc
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | BC557 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2, Q4, Q5, Q9, Q10 |
| 4 | BC547 | Package_TO_SOT_THT:TO-92_Inline | Q3, Q6, Q7, Q8 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.5mm_Pad | H1, H2, H3, H4 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 3 | 5K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R6, R7 |
| 3 | CD74HCT74E | 74HCT74_FOOTPRINTS:74HCT74 | U1, U3, U4 |
| 2 | 0.1u | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C2, C3 |
| 2 | 10n | Capacitor_THT:C_Disc_D7.5mm_W5.0mm_P5.00mm | C1, C4 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 220u | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P12.50mm_Horizontal | C5 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | LM324N | LM324_FOOTPRINT:LM324 | U5 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U6 |
| 1 | SN74AC00N | SN74AC00N_FOOTPRINTS:N14 | U2 |
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Questions
How big is the FINAL PROJECT PCB?
It measures 87.2 × 58.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the FINAL PROJECT use?
33 parts, built around the LM324N, CD74HCT74E, NE555P and SN74AC00N. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the FINAL PROJECT KiCad files?
From the LakshmanRohit/PLL-Type2 repository on GitHub, at the commit this page was made from: the board is FINAL PROJECT/FINAL PROJECT.kicad_pcb and its schematic FINAL PROJECT/FINAL PROJECT.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FINAL PROJECT design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).