2 layers216.9 × 86.8 mm
Sweepv2
davidphilipbarr/Sweep
Sweep - a small promicro based keyboard inspired by the Ferris.
51 parts2.1k
2 layers90 × 87.5 mm
T flop
jamdotjar/flip-flopA transistor based T flip flop circuit.
- Size
- 90 × 87.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 31
- Pads
- 94
- Tracks, vias
- 140, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 May 2025
- Updated
- 29 May 2025
Overview
T flop is an open-source printed circuit board by jamdotjar, from the jamdotjar/flip-flop repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 90 × 87.5 mm with 51 parts on 31 nets, routed with 140 tracks and 0 vias.
Its parts include 19 resistors, 15 transistors, 2 diodes and 1 switch.
README
README.mdT flip-flop
A transistor based T flip flop circuit. It uses 15 transistors, making 6 NAND gates. The design is based on an edge-triggered D flip-flop with one output fed into Data, and the user input acting as clock.
The design is a direct transfer of the logic-gate design into transistors. Each gate is fully built, which makes this a bit innefficent on part usage, but it's very simple design-wise. ( there's also lights for output, and a button for input ). The main challenge was figuring how to best use the limited resistor selection I had access to, without breaking the circit with a ton of random variance.
For the PCB, I just tried to fit the schematic inside the logic diagram, to some degree of sucess. The design on the back is the result of asking as many people as possible what they thought should go there. I have ( almost ) no complaints.
I've yet to assemble, but I will update this page once I do.
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | NPN | Package_TO_SOT_THT:TO-92L_HandSolder | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15 |
| 12 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4, R5, R6, R7, R8, R10, R11, R12, R13, R18, R19 |
| 11 | LOGO | LOGO | g, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** |
| 6 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R14, R15, R16, R17 |
| 2 | clipboard:47bf48cc-69b8-420b-ba80-34749ad7fe65 | , | |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
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Questions
How big is the T flop PCB?
It measures 90 × 87.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the T flop use?
51 parts. 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 T flop KiCad files?
From the jamdotjar/flip-flop repository on GitHub, at the commit this page was made from: the board is PCB/T-flop.kicad_pcb and its schematic PCB/T-flop.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the T flop design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).