The ll project is based on a pcb with a decade counter (CD4017) coupled to a timer (NE555). The frequency of the timer can be adjusted trough a potentiometer.
| Experience | Level |
|---|---|
| Soldering | |
| Mechanical |
| Type | File | Description |
|---|---|---|
| Schematic | pdf / cadlab | Schematic files |
| Board | pdf / cadlab | Board file |
| Drill | Drill file | |
| Gerber | zip / tar | Gerber/Drill files |
| Housing, PCB | zip / tar | Housing and PCB (STEP) files |
There are two parts of the hardware. The pcb and the housing of the LL. The pcb is created with KiCAD and the housing with FreeCAD. All files are built with github actions so that they are ready for a production environment. The housing is printed with a 3D-printer (Dremel 3D40).
The circuit board is populated on one side (Top). The best way for soldering is within a standard soldering system.
The housing has a tolerance of 0.2mm on each side of the case. So the pcb should fit perfectly in the housing. The tolerance can be modified with FreeCAD in the Parameter Spreadsheet.
| Type | Link | Description |
|---|---|---|
| CD4017 | Decade counter | |
| NE555 | Timer |
R. GAECHTER