2 layers60 × 50 mm
Discrete PLL
adasbl/Discrete-PLL-pcb
Discrete PLL (Phase-Locked Loop) design implemented in KiCad
59 parts
2 layers60 × 50 mm
Pll chip
TofTo23/pll_pcbCustom PCB for PLL (phase-locked loop)
- Size
- 60 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 34
- Pads
- 159
- Tracks, vias
- 392, 39
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Mar 2026
- Updated
- 18 Mar 2026
Overview
Pll chip is an open-source printed circuit board by TofTo23, from the TofTo23/pll_pcb repository on GitHub. It is a 2-layer board of 60 × 50 mm with 59 parts on 34 nets, routed with 392 tracks and 39 vias.
It is built around the CD4148WTP, BC846 and BC857. Its parts include 16 resistors, 15 connectors, 12 capacitors, 5 transistors and 4 diodes.
Main components
3README
README.mdProject of PLL
This repository covers designing the PLL schematic (LTSpice), creating the PCB layout, soldering and testing. Furthermore, there is the simple 3D model of case printed using 3D printer.
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 |
| 6 | PIN2 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J5, J6, J8, J9, J17 |
| 6 | PIN4 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J11, J14, J16, J18, J19, J20 |
| 5 | 10nF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C10, C11, C12 |
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C6, C7, C8, C9 |
| 4 | CD4148WT | Diode_SMD:D_0603_1608Metric | D1, D2, D3, D4 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C2, C4, C5 |
| 3 | BC846 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3, Q4 |
| 3 | PIN3 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1, J3, J15 |
| 2 | 33k | Resistor_SMD:R_0603_1608Metric | R2, R4 |
| 2 | BC857 | Package_TO_SOT_SMD:SOT-23 | Q1, Q5 |
| 1 | 10R | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 4030b | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | 47k | potent:CA14 VA12,5 | RV1 |
| 1 | TL074 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
Questions
How big is the Pll chip PCB?
It measures 60 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pll chip use?
59 parts, built around the CD4148WTP, BC846 and BC857. 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 Pll chip KiCad files?
From the TofTo23/pll_pcb repository on GitHub, at the commit this page was made from: the board is pll_chip.kicad_pcb and its schematic pll_chip.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pll chip design in my own project?
Its repository states no licence, so its author keeps all rights: ask TofTo23 before reusing the design.
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