Mini etching cuvette
Since I only etch my own boards very rarely and if, only up to the Eurocard at most, I have built a small etching cell. With its dimensions of 250mm x 170mm x 12mm it needs only a maximum of 150ml filling. With 30g of sodium persulfad this is enough for a double-sided eurocard with a useful track layout.
Ventilation is via a built-in air duct, which is provided with some 0.8mm holes at the bottom. The pump is a simple aquarium pump with 3W. The air volume is regulated by a simple screw valve.
I realized the heating via a 3.3Ohm high load resistor, which transfers its heating power to the etching liquid via an aluminum plate.
Stückliste:
| Stk | Name | X[mm] | Y[mm] | Material |
| 2 | Fronten | 250 | 170 | Plexiglas 2mm |
| 4 | Frame Seite | 250 | 10 | Plexiglas 4mm |
| 2 | Frame Unten | 150 | 10 | Plexiglas 4mm |
| 2 | Air duct Seite | 235 | 5 | Plexiglas 4mm |
| 2 | Air duct Unten | 140 | 5 | Plexiglas 4mm |
| 1 | Glue | ACRIFIX 1R0192 | ||
| 1 | Hot plate | 170 | 100 | Aluminium 2mm |
If you still want to afford a heating system with controller, here is a simple circuit diagram:
