I am creating a board to add additional functions to the old amp.
On 2017-03-10 13:18:35
Adjustment of the exposure time is necessary on the photosensitive substrate according to the date of manufacture, but in the case of a fine pattern it often fails, so development of a more stable method is desired.
There was unevenness in the application of photosensitizer in the edge part. It is not my imagination because the color is different visually at the time of taking out from the bag. Since it can cover enough with the layout, there is no problem if used carefully.