Exposure timer

eskoilola's picture
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Because I am making my own PCB:s I needed an exposure timer for the UV lamps.

The lams are of the fluorescent type and they must be ignited before they can emit light. Normally one has a device called "igniter" which is actually a vacuum tube delay having bimetallic contacts in it. The operation of the lamps is not very reliable with that one.

There is a rotary switch which is used to select the time. Also there is a button to start the thing. The button has a flashing light on it.