PCB Exposure using UV light LED box

I came across this interesting project. The guy decided to make UV PCB exposure box made of UV light LED’s. The main reason why he used LED was the power dissipation and compactness. Assuming that one UV tube would take about 6W while one UV LED would take about (20mAx3.2V=64mW). Most of that energy UV tubes dissipate as heat energy. So he took: 54 x UV LEDs of 400nm (6000 – 7000 mcd) – 100 units in Ebay costed 12€; 18 x 68ohms resistors 1/4W – 0,36 €; 1 connector – 0.50€; 1 electrolytic condenser of 2200uF – 30v; 1 Eurocard Plate 100×160 about 5 € ;  

Ultraviolet light source UV-80 for PCB exposure

One of more advanced PCB manufacturing methods is exposing laminate copper boards covered by photo resistive layer through mask. Using UV light in manufacturing PCB’s has many benefits according to other methods: you can get thin tracks like 0.2mm. You couldn’t do this by using other home techniques like laser printers or hand artwork; other advantage is that this method gives clean image – smooth edges of PCB tracks. Little bit effort and you can compare results to commercial products. And pf course third benefit is speed and multiple replications of your boards by using the same mask. In this article is described the manufacturing of an automatic ultraviolet light source exposure box.   Parts for UV box Case with organic glass Panel UV lamps ballasts and starters Controller     Case Case is made of 5mm wood board wired with screws.   Making a control panel Control panel consists …

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